GM Issues Fix For 2022 Bolt EV, Bolt EUV Transmission Malfunction Message
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GM has released a service update for certain 2022 Chevy Bolt EV and Bolt EUV over an issue related to the transmission.
The problem: in affected Chevy Bolt EV and Bolt EUV models, the driver information center (DIC) may display a malfunction indicator light (MIL) along with the message “Service Transmission, Unable to Shift,” or “Service Transmission Now, Unable to Shift Soon.”
The hazards: this problem does not pose a safety hazard, but it may affect the operation of the vehicle’s powertrain.
The fix: GM dealer technicians will be instructed to update the engine control module in affected vehicles. This should clear the error message in the DIC and clear the MIL.
Affected components: engine control module, software.
Affected vehicles:
- 2022 Chevy Bolt EV
- 2022 Chevy Bolt EUV
Number of affected vehicles: it’s unclear how many vehicles are affected by this Service Bulletin. Affected vehicles are located in North America, Brazil and South Korea.
Owners should: GM will notify owners of affected vehicles and instruct them to make an appointment with their dealer. Owners that are unsure whether or not their vehicle is affected by this service bulletin can reach out to GM directly with any questions or concerns they may have using the Service Update number and contact information included below.
Contacts:
- Service Update number: 22-NA-139
- Chevrolet Customer Service: 1-800-222-1020
The Chevy Bolt EV and Bolt EUV crossovers are produced at the GM Orion plant in Michigan. The 2023 model-year Bolt EV and Bolt EUV began rolling off the production line there on July 21st.
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Why would this even have a transmission – more complexity, cost and something else to break. They should just cut their losses with this tainted car and focus on their new Ultium platform vehicles.
If you don’t know the fact that all EVs have transmissions, then your opinion is invalid.
Sam:
Sorry – all Bolts have a very simple dual stage Helical reduction gearing, which is simply to allow the use of a low cost motor… If this weren’t an issue then the drive motor would directly drive the transaxle – similar to the way a high-speed elevator has a direct-drive motor running at the same speed as the car.
The fact that you got 15 thumbs up means plenty of others here don’t know how the car works either! No offense !
Common parlance in the past 150 years is such a simple system is ‘at best’ called a gear reducer and nothing more… It is *NOT* a transmission in the sense that term is commonly used.
Many have a 2 speed, as they need the torque to go up a hill without burning up the coils and intestate speeds without burning out the bearings
The bolt per se is a single speed unit, but also features a transaxle, gear reeducation, differential and locking park brake, so it’s a little less complicated than a 5 speed manual transaxle
Steve:
The ‘transmission’ in cars like the 2 versions of the VOLT perform multiple chores and 4 or 5 different operating modes (at least in the second generation models) – but I’m unaware currently of any PASSENGER car that is both FULLY ELECTRIC and also has a transmission, except for the esoteric Porsche Taycan.
I would hardly say that is ‘many’… Earlier versions of the Tesla Roadster had a 2 speed transmission locked in high gear… My later roadster had a simple gear reducer and that was it.
mvb
Relax;
GM has not made a Battery electric vehicle (BEV) – the trendy phrase indicating it has no internal combustion engine – that has a transmission in it – from the EV1 on, or even before that with some electric S10’s or Corvairs.
So there is no “complexity, cost, nor something else to break” in either the BOLT EV, EUV, Hummer EV, those BrightDrop van thingys , or my upcoming Caddy LYRIQ, or the upcoming Silverado, Blazer, and Equinox EVs.
I was one of the first to identity this problem to GM and my EUV was in the shop for 10 days while they searched for a fix!
Can this be fixed?
Yes, it’s a software update. My car is fine now.
Where do I get the software update?
COntact your dealer – it’s a TSB, not a recall.
So why should only a few vehicles have this problem. Should GM update software for all 2022 Bolts?
I think it depended on when the car was assembled – it was based on some bad modules. The software is a workaround basically…
Since my 2022 BOLT EUV doesn’t have a transmission – lets forget the goofy shut down faulty programming and start making me THE new battery I was promised over 1 1/2 years ago when I bought the thing!
I found the only bad problem with a single speed transmission; has no resever to pass, I tryed to pass a heavy hauler, the power was just not there, I’m so use to the car down shifting and flying by it. Not now. Bolt doesn’t fly well. Reminded me of being behind the wheel of those trucks with no passing abililty. Needed the generator to pass.
I have no problem passing truck. Now I’m not try to pass going 90 but hit 80 with ease. How fast you pass is a personal decision. Bolt EUV is not a sport car, it is a commuter car and city car that does all I need. Compared to other small compact cars and it far exceeds expectations.