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U2605 Network · manufacturer code
U2605 fault code: what 6 Chevrolet owners reported
U2605 is a manufacturer-specific network code (network: communication between the car's control modules), so its exact definition belongs to the carmaker and is not in the generic OBD-II list. What it meant in practice is below, from 6 complaints owners filed with NHTSA. Updated November 9, 2026.
- 6owner reports
- 1car model
- 0mention a crash
- 0mention a fire
- 2016–2017model years
Which cars get code U2605?
Every model whose owners mentioned U2605 in a complaint, most reports first. Each year opens that car's full problem report. Popular models collect more reports because more of them are on the road.
Where does U2605 show up?
By brand
- Chevrolet6
Component the owner filed it under
Is there a recall for U2605?
As of November 9, 2026, no NHTSA recall on the cars reporting U2605 names this code or its most-reported component. Recalls can be issued at any time: check your VIN at nhtsa.gov/recalls.
What happened when owners saw U2605?
6 of the 6 reports, spread across the models above, as the owners wrote them. NHTSA removes names and VINs; long reports are trimmed. CarHooq has not verified individual claims.
I have a 2016 Chevy volt. It had to be towed to a Chevy dealership because it will not drive. The BECM module has failed, as is apparently the case with so many volt owners. GM, as a result of lawsuits about this car, extended the warrantee to fix the issue, but my vin number is not included in the case. The gar is a brick, and there is no way to fix it now. GM doen't even replace these batteries any more, and most often just buys back the bad vehicles. I still owe 9k on this car and it is useless now. I need help. These are the codes is is throwing. B101D P1EOO P1EAC POAFA B3111 U3001 U2401 U2603 U2604 U2605 U2606 U2617 U2618 U2619 U2620 U2621 U2622 U2623 U2624 P1FD1 P1FD2 P1FD3 P1FD4
While driving approximately 65 MPH on an interstate highway, the vehicle's check engine light illuminated. Very shortly after, the dashboard screen displayed the message "propulsion power reduced," and the internal combustion engine turned on. The vehicle's power was significantly reduced, almost causing an accident when another car started merging without checking their blind spot, forcing me into the left lane in front of a third vehicle that had to brake sharply to allow me to accelerate to keep up with traffic in that lane. Upon scanning the vehicle with an OBDII reader, codes P1E00, P1F06, U2603, U2604, U2605, U2606, U2617, and U2618 were present. Together, these codes indicate an issue…
My experience required me to tow my 2017 Chevy Volt from a parking garage, where the BECM died, to 2 different dealerships back and forth to my home. I have been charged over $1,000 in towing and diagnostics at my local dealerships. As usual they informed that I need a new $10k battery. I did my own research and the error codes (U2603, U2604, U2605, U2606, U2617, U2618, U2619, U2620, U2621, U2622, U2623, U2624 and P1E00) clearly indicate that my BECM failed. I was able to check the health and status of the traction battery and it functioning correctly. On my 3rd trip to my local dealership service department with the Special Coverage Program N232432680 in hand, the dealership informed me…
…I managed to capture these error codes while the MIL light was on: U2603, U2604, U2605, U2606, U2617, U2618, U2619, U2620, U2621, U2622, U2623, U2624 [XXX] my vehicle no longer drives or shifts out of park, "Not able to charge" message displayed, CEL light on. A class action lawsuit revealed a technical service bulletin 18-NA-261 released in 2018 (see attached) accusing GM of continuing support of the known faulty module. The result of the case was Special Coverage Bulletin N232432680 which acknowledges and addresses the above mentioned issues by replacing a faulty BECM common to ALL Chevy Volt models years 2016-2018. My VIN is EXCLUDED from coverage due to being a CARB compliant vehicle…
The car states the battery will not charge and cannot move the car. I connected it to a code reader with the following codes showing: P1E00 U2618 U2606 U2605 U2617 U2604
BECM failure resulted in a situation where the vehicle drove with erratic surging power delivery throwing engine codes P1E00, U2603,U2604, U2605,U2606 Regen braking in this vehicle has a dedicated control on the steering wheel which applies only regen braking no friction brakes. When battery state of charge is high this can result in a situation where the regen braking button abruptly (i.e. during one extended activation of the button) delivers less brake force than the user is demanding.
U2605: questions drivers ask
What does code U2605 mean?
U2605 is a manufacturer-specific network code (network: communication between the car's control modules), so its exact definition depends on the carmaker and is not in the generic OBD-II list. 6 owners reported it to NHTSA, most often for the Chevrolet Volt (6); their reports describe what happened.
Which cars get code U2605 most often?
In NHTSA owner complaints, U2605 is mentioned most for the Chevrolet Volt (6), across 1 model and model years 2016 to 2017. Popular models collect more reports because more of them are on the road.
Is there a recall for code U2605?
As of November 2026, no NHTSA recall on the cars reporting U2605 names this code or its most-reported component. Recalls can be issued at any time, so check your VIN at nhtsa.gov/recalls.
What should I do if my car shows U2605?
Write down when the code appeared and what the car did (warning lights, loss of power, noises, speed, weather). Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer or independent workshop to read the stored freeze-frame data before anyone clears the code, and keep the repair order. If the car loses power in traffic, stop driving it. CarHooq does not diagnose: these are owner reports and official recall notices, not repair advice.
How this page was made
CarHooq read the text of every owner complaint filed with NHTSA for 19 US and European brands (model years 2012 onwards) and picked out the diagnostic trouble codes owners wrote down. This page lists every mention of U2605. Manufacturer codes have no public standard definition, so CarHooq shows only what owners reported. Nothing here is a diagnosis. More answers: the fault code FAQ. Data: NHTSA Office of Defects Investigation (public domain), retrieved November 9, 2026. How CarHooq reports are made.
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