Fault Code Lookup › Network codes › U2623
U2623 Network · manufacturer code
U2623 fault code: what 8 Chevrolet owners reported
U2623 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 8 complaints owners filed with NHTSA. Updated November 9, 2026.
- 8owner reports
- 1car model
- 0mention a crash
- 0mention a fire
- 2016–2018model years
Which cars get code U2623?
Every model whose owners mentioned U2623 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 U2623 show up?
By brand
- Chevrolet8
Component the owner filed it under
Is there a recall for U2623?
As of November 9, 2026, no NHTSA recall on the cars reporting U2623 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 U2623?
8 of the 8 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.
My 2018 Chevrolet Volt LT (VIN [XXX]) suffered a Battery Energy Control Module (BECM) failure at 142,185 miles. Gandrud Chevrolet in [XXX], diagnosed the failure, citing GM Technical Service Bulletin 18-NA-261 and diagnostic codes U2619, U2620, U2621, U2622, U2623 and U2624. The dealer replaced the BECM (part 24296900), programmed it, and performed associated work. The repair was completed XXX. The invoice was $3,160.70; I am seeking $3,066.25 in reimbursement for the qualifying repair expenses. GM denied coverage because my VIN is excluded from Special Coverage XXX, despite the dealership-confirmed BECM failure. I pursued the matter through GM Customer Assistance (case 106790207), mediation…
…B101D P1EOO P1EAC POAFA B3111 U3001 U2401 U2603 U2604 U2605 U2606 U2617 U2618 U2619 U2620 U2621 U2622 U2623 U2624 P1FD1 P1FD2 P1FD3 P1FD4
My 2017 Chevy Volt stalled, wont charge, safely concerns. safety-related special coverage is being denied by local Chevy dealer. Check Engine light codes U2603-06, U2623, well known issue in chevy volt community, that points to Chevy faulty BECM. Chevy replace these to some selected 2016-2018 vehicles, but they wont cover mine, while I have same exact issue. Please help to push on Chevy to cover all 2016-2018 Chevy Volt by recalls repairs with no cost to owner. thanks
…After reading the codes again in the afternoon, the following codes posted: P1E00, U2622, U2623, P1FD4, P0AFA. These codes and behavior are consistent with the following NTSB service documents, which call for the replacement of the BECM: Special Coverage N232432680 Technical Service Bulletin 18-NA-261 However, the vehicle in question does not appear to be one of the 19,000 vehicles covered under the special coverage, per GM’s warranty look-up. The vehicle has not yet been serviced for the above events, but it is assumed the BECM is failing, which is available for inspection. My safety was not put at risk this time, but it is possible for the BECM to fail in an unsafe manner. Additionally…
My 2017 Chevy Volt is having Battery Energy Control Module (BECM) issues. I receive the occasional error message of "propulsion is reduced" and engine fault codes of P1E00, U2619, U2620, U2621, U2622, U2623, and U2624. GM issued a Special Coverage bulletin (N232432680) extending the warranty for the Battery Energy Control Module (BECM) on 2016-2018 Chevy Volts to 15 years/150,000 miles. My Chevy Volt is within this year and mileage range, but for some reason my Chevy Volt VIN is not included in this Special Coverage (N232432680), which means that this special coverage for some reason doesn't apply to my 2017 Chevy Volt, even though it has the same issue. Is there a way that my 2017 Chevy…
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…
ERRORS: "UNABLE TO CHARGE", U2619, U2620, U2621, U2622, U2623, U2624, UB2AAA, BECM NEEDS REPLACING; ALSO "SHIFT TO PARK" ERROR IS VERY COMMON IN THIS CHEVY VOLT.
U2623: questions drivers ask
What does code U2623 mean?
U2623 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. 8 owners reported it to NHTSA, most often for the Chevrolet Volt (8); their reports describe what happened.
Which cars get code U2623 most often?
In NHTSA owner complaints, U2623 is mentioned most for the Chevrolet Volt (8), across 1 model and model years 2016 to 2018. Popular models collect more reports because more of them are on the road.
Is there a recall for code U2623?
As of November 2026, no NHTSA recall on the cars reporting U2623 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 U2623?
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 U2623. 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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