I've had my Volt for a month and it's been fantastic. However, my check engine light came on last night. I did not notice any other symptoms and the Volt drove home just fine. The closest authorized Volt dealer (at least with any experience) is 90 miles away. Can I get a code read by using On-Star? Is it OK to ignore this for a few days to see if it goes away? Any advice?

Dont ignore it. Use Onstar asap to have the tell you the exact 'diagnostic code'. (get the exact number so that folks here can help you). The Onstar advisor may tell you to go straight to your dealer. I would check here first (some code are not that bad...and some even seem to reset), however I would advise you do not drive the car much until you get more data.
Once you get the code, post it here and folks may help if they have even seen it before....

Stilgar

I talked to On Star. The code is P0D22 - Battery Voltage Sensing Error. They advised me that I might not be able to charge the Volt. Not true. The Volt charged just fine. I don't notice anything wrong. I think it was a voltage measurement glitch. One thing I did do a couple of times is unplug the Volt after it was fully charged and then plugged it back in immediately. Makes me wonder if this caused the glitch. Anybody know anything about this code?

I had the exact same thing happen, from the exact same cause (unplugging/replugging with full charge, 120V connection).

Unless GM says otherwise, you are okay and the CEL should turn itself off after 2-3 days. It is a bit disconcerting, but at least we know the car is being sensitive!

Since then I've just left the Volt plugged in at all times, unless I'm ready to go!

Chris

I talked to On Star. The code is P0D22 - Battery Voltage Sensing Error. They advised me that I might not be able to charge the Volt. Not true. The Volt charged just fine. I don't notice anything wrong. I think it was a voltage measurement glitch. One thing I did do a couple of times is unplug the Volt after it was fully charged and then plugged it back in immediately. Makes me wonder if this caused the glitch. Anybody know anything about this code?DTC P0D22 is actually titled: Battery Charger Output Current Performance. Typically it would be detected and set during charging it should first A) temporarily disable charging (until the next charge cycle) and B) brings on the Check Engine Lamp (MIL) on the next drive cycle.

Basically P0D22 indicates that during the charge, the measured charging current was not within certain parameters over a defined period of time. If your Volt appears to be charging normally then the fault is no longer present.

I am wondering about the repeated disconnects-reconnects though. I suppose it might have created a false fail somehow. If it sets again you'll definately want to take it to your dealer.

WopOnTour

I did a search and found the other thread about CEL codes and specifically this code that Chris had. It makes me suspect an unanticipated scenario by the developers with this error - plugging in when Volt is fully charged. That might cause the charge current to never reach the expected levels within the 40 seconds and an error is flagged, but the reality is that the Volt is simply fully charged. There needs to be a check on the voltage before flagging the error. If the voltage is above a certain threshold, the error should not be flagged. Or perhaps that is already done, but the threshhold needs adjustment. Or maybe I'm way off.

I did a search and found the other thread about CEL codes and specifically this code that Chris had. It makes me suspect an unanticipated scenario by the developers with this error - plugging in when Volt is fully charged. That might cause the charge current to never reach the expected levels within the 40 seconds and an error is flagged, but the reality is that the Volt is simply fully charged. There needs to be a check on the voltage before flagging the error. If the voltage is above a certain threshold, the error should not be flagged. Or perhaps that is already done, but the threshhold needs adjustment. Or maybe I'm way off.I agree. There might also be an issue with the enable/fail criteria as documented in gSI.
But my understanding was when the charging was in voltage regulation mode (initially and during the finish of charging) the P0D21 would set if charging voltage wasnt correct, but when in current regulation mode (during the majority of the charge cycle) then P0D22 sets if measured charging current was not correct. (a you said for 40 seconds)

I've unplugged and plugged in the car while charging AND when fully charged (both repeatedly) and never had this DTC set falsly, but it might still under very specific conditions that we've yet to define. If it is false it's nothing that software can't rectify of course, so that's why I'd suggest a dealer visit (if not TOO inconvenient) even if it doesnt reset as it needs a case# to get something happening.Plus there should be a Freeze Frame that would indicate the conditions present when the fault was detected.

But there's also a recent (since SOP) update for the onboard charger control module listed in TIS2WEB. It's titled "OBD II diagnostic software and calibration changes". I'll try and find out exactly what it specifically addresses but if you took it to the dealer they could easily determine if you have this update already.
HTH
WOT

Thanks to all of you for responding on this thread. This forum is golden for Volt owners. Thanks WOT.

Wanted to let everyone know that it is not necessary to bring a Volt to a dealer with a P0D22 code at this time, as long as there are no charging complaints.

Thanks,
Caron - Chevrolet Volt Advisor
socialmedia@gm.com

My CEL went out today. Car is fine. No problems with charging at any time, including when the light came on. Again, thanks for the information and advice. I love my range extended electric car.

Received a call last evening from GM conducting a survey of Volt owners to see if any problems have arisen so far. None had at that time. However today the engine light went on. I called On Star who informed me that it was a P0D22 error. They called the dealer, made an appoint for me for tomorrow morning. Came home and checked this thread. I called a Volt Advisor, asked them to confirm that I wouldn't have to take it in, which they did about an hour later with a return call. Thanks to all the posts on the thread as I was able to give the Volt Advisors the correct info and you saved me a trip to the dealer. Does anyone know if a software fix is on the way?

My Volt recently had seven "control modules" upgraded (software)... I suspect one of them addresses this Voltage sensing error sensitivity.

My Volt recently had seven "control modules" upgraded (software)... I suspect one of them addresses this Voltage sensing error sensitivity.

Who recommend or identified the modules to be upgraded. Or was it just done during scheduled/unschedule a trip to the dealer?

Who recommend or identified the modules to be upgraded. Or was it just done during scheduled/unschedule a trip to the dealer?Generally, unless your Volt is exhibiting some sort of negative behavior or "symptom" there will be no need for routine visits for software updates. Information is provided to dealerships as to important software updates via an internal Technical Service Bulletin (TSB) system, and will typically be addressing specific concerns/complaints.

More critical updates would either be made part of a GM campaign (aka "recall") or if deemed necessary dispatched utilizing the new Over The Airwaves (OTA) update system via Onstar, however this OTA system is still in early development stages. The reliability of programming via OTA is very much dependant on a "stabilized" vehicle condition that will require customer cooperation in order to be successful (they absolutely can't just "reflash" one of your modules while you are "just driving along" on the Interstate.)

I've been monitoring the release of updates as well as TSBs that are released indicating an update might be required across a large segment of the current Volt population, and to-date there is nothing "critical". (My plan would be to have an official "Volt TSBs" thread created at some point/time to better support this)
However IF your Volt has been setting DTCs or has any other sort of operational complaint, a dealer visit will certainly prompt the software levels to be scrutinized sufficiently to deal with the concerns, should a revision exist.

WopOnTour

I've been monitoring the release of updates as well as TSBs that are released indicating an update might be required across a large segment of the current Volt population, and to-date there is nothing "critical". (My plan would be to have an official "Volt TSBs" thread created at some point/time to better upport this)
However IF your Volt has been setting DTCs or has any other sort of operational complaint, a dealer visit will certainly prompt the software levels to be scrutinized sufficiently to deal with the concerns, should a revision exist.
WopOnTour

A Volt TSBs specific thread would be great! (Should be read only for most).

Stilgar

they absolutely can't just "reflash" one of your modules while you are "just driving along" on the Interstate.

Assuming adequate on-vehicle storage capacity, they could download an upgrade for modules while you are "just driving along" on the Interstate. They just shouldn't install them until the car is off, and preferably plugged in to indicate it's likely to stay off for a bit. An "upgrades available, proceed to install screen?" might be nice.

Assuming adequate on-vehicle storage capacity, they could download an upgrade for modules while you are "just driving along" on the Interstate. They just shouldn't install them until the car is off, and preferably plugged in to indicate it's likely to stay off for a bit. An "upgrades available, proceed to install screen?" might be nice.FYI That's exactly what "reflashing" means, installing them. Where they are sourced or temporarily stored is irrelevant IMO.
My point was the vehicle condition that must be present during the actual installation must be highly controlled.
Something that cannot be easily guaranteed or perhaps not ever occur without the owner/user cooperation I was referring to.
Wasnt saying there wasnt the potential to make it work, as obviously they already have...
WOT

The upgrades via OnStar could be initiated through the OnStar MyLink app. Since the app could be updated to provide user input and feedback, it might be an easy solution for those who do not want to visit their dealer.

OnStar knows when the vehicle is charging, so that could be a requirement to make sure that the Volt is not in use.

My Volt recently had seven "control modules" upgraded (software)... I suspect one of them addresses this Voltage sensing error sensitivity.
I can confirm there are software updates available for a number of system modules for cars built prior to BU100954

These updates can be performed by your Volt dealer but are really only neccesary if very specific faults are being observed by the owner/s.

These include ANY of the following concerns,

Check Engine Light (MIL) or associated system warnings as a result of DTCs setting in any combination in the following modules:

Engine Control Module (ECM)- P0128 P0604 P06E4 P1133 P2181
Hybrid Powertrain Control Module 1 (HPCM1)- P07A3
Hybrid Powertrain Control Module 2 (HPCM2)- P0ABB P0604 P0D26 P0CD2 P0C4A
On-Board Battery Charger Control Module (OBCM)- P0D3E P0D3F P1F05
Accessory (14V) Power Module (APM) P1EA8 P1EA9
Intermittent Navigation Radio Reset and Rear Park assist volume concerns
ANY issues regarding operatonal concerns of the climate control system, (esp with respect to heated seats or fan blower functions)

Many thanks goes out to early adopters of the Volt for their asisstance in identifying these issues and their patience in helping their dealer and Volt technical assistance in determining root causes and reach final resolutions.

There is no subsitute for "real-world" experience! :D

HTH
WopOnTour

Thanks for the details WOT!

I can confirm there are software updates available for a number of system modules for cars built prior to BU100954

These updates can be performed by your Volt dealer but are really only neccesary if very specific faults are being observed by the owner/s.

These include ANY of the following concerns,

Check Engine Light (MIL) or associated system warnings as a result of DTCs setting in any combination in the following modules:

Engine Control Module (ECM)- P0128 P0604 P06E4 P1133 P2181
Hybrid Powertrain Control Module 1 (HPCM1)- P07A3
Hybrid Powertrain Control Module 2 (HPCM2)- P0ABB P0604 P0D26 P0CD2 P0C4A
On-Board Battery Charger Control Module (OBCM)- P0D3E P0D3F P1F05

Plus ANY issues regarding operatonal concerns of the climate control system, (esp with respect to heated seats or fan blower functions)

*There will also be an update released very soon to remedy various Nav Radio issues resulting from a "resetting" condition

Many thanks goes out to early adopters of the Volt for their asisstance in identifying these issues and their patience in helping their dealer and Volt technical assistance in determining root causes and reach final resolutions.

There is no subsitute for "real-world" experience! :D

HTH
WopOnTour

When the GM engineers were at my house yesterday trying to diagnose power problems, they instructed me to take the car to the dealer to get the most current software upgrades. I am presuming they are referring to the ones you mention here.

You do a great service.

# 565

My check-engine light is back on. For the third time. Each time was about 2 or 3 weeks apart. Same 2 codes every time: P0D22 (Lithium Ion battery not performing as expected, service within 24 hours) and P1E00 (Electric propulsion control not performing as expected, service when convenient).

The first time I got the check engine light I took it to the dealer. They gave me a loaner car and kept the Volt 3 days. GM sent a specialist to look at it, they couldn't see anything wrong.

The second time I got the check engine light I ignored it and it went away after a few days.

This time I've set another appointment at the dealer for this Monday. I'll post the result.

I've never had any performance problems or "symptoms" other than the check engine light itself.

I charge every night with the Voltec 240V charger, wondering if there's something wrong with it.

honoreitiscom,

Just sent you a private message.

Thank you,
Caron - Chevrolet Volt Advisor
socialmedia@gm.com

My check-engine light is back on. For the third time. Each time was about 2 or 3 weeks apart. Same 2 codes every time: P0D22 (Lithium Ion battery not performing as expected, service within 24 hours) and P1E00 (Electric propulsion control not performing as expected, service when convenient).

The first time I got the check engine light I took it to the dealer. They gave me a loaner car and kept the Volt 3 days. GM sent a specialist to look at it, they couldn't see anything wrong.

The second time I got the check engine light I ignored it and it went away after a few days.

This time I've set another appointment at the dealer for this Monday. I'll post the result.

I've never had any performance problems or "symptoms" other than the check engine light itself.

I charge every night with the Voltec 240V charger, wondering if there's something wrong with it.

FYI...WOT posted a slightly different description for the POD22. He said it was "Battery charger output current performance". He also said that if it charged normally it should not be a big deal...

Stilgar

FYI...WOT posted a slightly different description for the POD22. He said it was "Battery charger output current performance". He also said that if it charged normally it should not be a big deal...

StilgarCorrect!
A DTC P0D22 has been oberved being set on a handful of Volts immediately after charging under fairly precise (typically colder) temperature conditions. There's nothing really wrong here except software designed to detect faults in the charging operations is just a bit too "picky".

Engineering is aware of it and is working on a software recalibration to remedy it. For now I would suggest ANYONE getting a Check Engine Light and Onstar indicates a P0D22 AND the car is charging and operating fine, that you just call your Volt advisor so the fault is logged. But visiting your dealer is probably a waste of everyone's valuable time at this point. (again assuming NO operational concerns exist)

As soon as an update is available I will post it in this thread

THANKS TO ALL THE VOLT PIONEERS!!!

WopOnTour

Took my Volt in for the second time for these same codes. My dealer had a GM engineer look at it. They did a "flash" on my car to update the software, which they said would fix my P1E00 code (and P0C4A). I believe the update they installed is called PIP4875.

Just as WOT indicated below, they said an update for the P0D22 error code is currently in the works. They said if I keep getting that code turning on my check engine light, in a few months I should be able to get another flash update to fix the P0D22 false alarms.

My dealer also said the problem was related to charging in extremely low temps, which is something I do all the time, and which also matches WOT's comments below.

Now I have to reset all my default settings, radio station presets, clock, etc. It was fun to see my full battery indicating 38 miles of range! I expect it will soon re-learn that it lives in the frozen tundra, and will once again start showing ~32 miles of range on a full charge.

My dealer is literally a 5 minute drive from my house, and they give me rides back and forth, so I don't view this as any hassle at all. And my dealer is in WI, not a launch state, and yet I've had no problem getting it serviced. So I'd have to say GM is doing a good job with this. Plus, I have had no actual problems with the car's performance/operation, just the check engine light.

I don't mind being an early adopter and helping diagnose these things. Seems to me GM made sure the car works before they launched. They may have been a bit aggressive with error code tolerances, which is good and is understandable. I'd rather they were more aggressive than lax. Now they are backing off the tolerances a bit in the software, just fine tuning, if I'm reading this right.

honoreitiscm, Thanks for sharing your experience getting your Volt "updated"
You are very correct in stating that basically the self-diagnostics routines for a few items had been "over-aggresive" detecting fault when in fact none exist. An unfortunate but not totally unexpected artifact of launching such a revolutionary propulsion system into public consumption across a very braod range of real-world usage and ambient condition.

The PIP4875 is actually a preliminary service bulletin used to inform the techs of the details of the update (which modules and which concerns)

Received official notification today that this has now been updated to PIP4875A (March 1 2011)

and now includes updates for the Accessory Power Module (APM) and potential DTCs P1EA8 P1EA9
it also includes navigation radio software revisions to address various concerns

BUT STILL is not corrected to deal with the false P0D22
Will post here if/when I learn more
WOT

I wonder if one of these service up dates will fix our screen from blacking out. Vin#951 I guess we'll find out Monday. No error messages though. Also, no more connections from MyVolt or smartphone. Started today.

deleted post (duplicate data)

I wonder if one of these service up dates will fix our screen from blacking out. Vin#951 I guess we'll find out Monday. No error messages though. Also, no more connections from MyVolt or smartphone. Started today.Doubtful. Your issue does not sound like a software related problem. Hopefully just a connection issue. Were you manually controlling your headlamps during daylight hours (when this fault was observed) by any chance?

In any case your dealer is sure to get it fixed up.
WOT

Doubtful. Your pissue does not sound like a software related problem. Hopefully just a connection issue. Were you manually controlling your headlamps during daylight hours (when this fault was observed) by any chance?

In any case your dealer is sure to get it fixed up.
WOT

No, the headlights are kept on auto. The console screen has been fine. It's only happening on the speed, range, etc. screen. While leaving the grocery store, the screen did not come on a all until driving for awhile. Then it blinked on and off randomly. Got home and shut the car off. Then started back up and drove up the street a short distance and the speedometer went to 0 and the screen went black for a second, then came back on. Hopefully, just a loose connection?

Hello all new Forum Memeber here. I have a question regarding 2 MIL codes P0CD2 and P1E00. I have seen both mentioned in this thread. Our vehicle is running fine with the exception of trying to get a "Full" charge. The vehicle is running in the Auburn Hills, MI area. When charging on the GM Voltec 220V unit for 8 continious hours we are only seeing 25-28 miles. When charging overnight using 110v we have seen as little as 0 miles up to 15 miles of battery life. Our VIN is BU100781.

My question is will / could the software upgrade mention above and the PIP4875A solve this issue?

Thanks for your response

Rodney

I charge my Volt outside here on Long Island. If the temperature is in the 30s in the morning (therefore colder overnight), I get about the same range as you - 25-28 miles(I charge only with the 120V unit). Be sure the charger is set to the "HIGH" position and that all of the green lights are on. Also, check the green charge light on the dashboard. Sometimes, the charger is particular with the order in which you plug it and the car in. You should first plug the charger into the outlet and then plug the charger into the car.
If all this is OK, get a Kill a Watt device (it measures watt/hours) and see if the car is getting a full night's charge.

You should no see '0 to 15' off the 110. Something is wrong. As other have said...ensure the 110 charger is set to HIGH (ie all green lights on).
Also...as the temp increase you will see a increase in total charge.
In Houston currently with average of about 65 degrees I am seeing a 42 mile range total daily.

Stilgar

First thanks for the input regarding the low battery milage that I've been experiencing. I will pay closer attention to the order that I plug in the home charger. One thing I'm struggling with is the "High" setting. Where can I find more information regarding this setting? Is there a section in the owners manual that refers to this setting?

I also want to add, because I don't think I made it clear that my vehicle has tripped the MIL light and the codes P1E00 and P0CD2 are what pops up on the OBDII equipment here at work. The local dealer stated that it was because the door to the charging port was not opening correctly. The document ID that they refered to is "PIC5415: Charge Port Door Freezes Shut and / or CEL with DTC P0CD2".

Still wondering if reflashing the vehicle might improve the charging situation.

Regards,
Rodney

Is there a section in the owners manual that refers to this setting?

Owners manual section "Charge Level Button" (on or about page 9-56, depending on edition). You can't change the charge level if the car is plugged in. Makes sense, since that sort of thing is negotiated at charge initialization.

First thanks for the input regarding the low battery milage that I've been experiencing. I will pay closer attention to the order that I plug in the home charger. One thing I'm struggling with is the "High" setting. Where can I find more information regarding this setting? Is there a section in the owners manual that refers to this setting? Regards, Rodney
Owner's manual page 9-56. Remember only change levels when it is not plugged into the car.

Hi, Rusty. You and I were typing at the same time again. (Great minds and all that.) ;)

Hi, Rusty. You and I were typing at the same time again. (Great minds and all that.) ;)

Yeah, and ours too! :D

First thanks for the input regarding the low battery milage that I've been experiencing. I will pay closer attention to the order that I plug in the home charger. One thing I'm struggling with is the "High" setting. Where can I find more information regarding this setting? Is there a section in the owners manual that refers to this setting?

I also want to add, because I don't think I made it clear that my vehicle has tripped the MIL light and the codes P1E00 and P0CD2 are what pops up on the OBDII equipment here at work. The local dealer stated that it was because the door to the charging port was not opening correctly. The document ID that they refered to is "PIC5415: Charge Port Door Freezes Shut and / or CEL with DTC P0CD2".

Still wondering if reflashing the vehicle might improve the charging situation.

Regards,
RodneyWell given that you ARE VIN# 00954 (and that is supposedly the cutoff point for the software bulletin) I would probably still have the dealer sheck to see if there are updates. The bulletin is clearly worded "Volts built before 000954" but...if you are getting this DTC it sounds like you just might need it still

WOT

Well given that you ARE VIN# 00954 (and that is supposedly the cutoff point for the software bulletin) I would probably still have the dealer sheck to see if there are updates. The bulletin is clearly worded "Volts built before 000954" but...if you are getting this DTC it sounds like you just might need it still

WOT

Once I got the fix WOT is talking about, the problem you describe went away for me.

# 565