U2603 on Chevrolet
On the Chevrolet Volt, U2603 is the first of a block of codes set when the Battery Energy Control Module loses communication with the battery interface modules
Severity: Inspect soon
Chevrolet Volt owners report the high-voltage battery control module failing with sudden reduced or lost drive power, a car that will not shift out of park or start, and a stall in traffic. High-voltage parts are not a home repair, so have it inspected soon.
It gets more serious if:
- Stop: Stop if the car loses drive power, shows Propulsion Power Is Reduced, or stalls while driving: pull over where it is safe and arrange a tow instead of restarting and continuing.
This page covers only what differs on Chevrolet. For what U2603 means, the ranked causes and the test order, see the U2603 guide.
What's different on Chevrolet
ChevroletYour car
2016–2018 · Volt
Supported by vehicle dataOwners of 2016-2018 Volts report U2603 through U2624 with P1E00 and a BECM replacement. Owner complaints cite a GM bulletin (18-NA-261) and a special coverage; neither document was read, so treat both as unverified.
Sources and review
- NHTSA complaint ODI 11745949: 2017 Chevrolet Volt
- NHTSA complaint ODI 11706596: 2017 Chevrolet Volt
- NHTSA complaint ODI 11669821: 2017 Chevrolet Volt
- NHTSA complaint ODI 11766936: 2018 Chevrolet Volt
- NHTSA complaint ODI 11752752: 2018 Chevrolet Volt
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error