U18A2 on Chevrolet
On Chevrolet, U18A2 means the engine computer lost communication with the fuel pump driver control module
Severity: Inspect soon
Chevrolet owners report a stall with no warning, including at about 35 mph and on the highway, and a no-start; fuel delivery loss is a safety risk in traffic, so have it checked soon.
It gets more serious if:
- Stop: Stop if the engine stalls while driving, or you smell fuel or see fuel leaking: do not keep restarting it; get it towed.
This page covers only what differs on Chevrolet. For what U18A2 means, the ranked causes and the test order, see the U18A2 guide.
What's different on Chevrolet
ChevroletYour car
2014–2016
Supported by vehicle dataGM information PIP5427 covers 2014-2016 Silverado, Tahoe and Suburban (and GMC and Cadillac twins) with P2635, U0074 and/or U18A2. Whether it is still current is not verified.
PIP5427Status unverified
SES light with P2635, U0074 and/or U18A2
2014–2016silverado-1500, silverado-2500-hd, silverado-3500-hd, tahoe, suburban · NHTSA 10099961
Preliminary information for technicians: follow published diagnostics when P2635, U0074 and/or U18A2 are stored, with U0074 taking priority over U18A2.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Sources and review
- GM PIP5427: SES light with P2635, U0074 and/or U18A2 (2014-2016 full-size trucks and SUVs)
- NHTSA complaint ODI 11744381: 2022 Chevrolet Blazer
- NHTSA complaint ODI 11654420: 2020 Chevrolet Equinox
- Fuel Pump Power Control Module Internal Short
- 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