P1682 on GMC
Engine computer’s two ignition voltage feeds disagree (GM)
Severity: Inspect soon
GM bulletins tie P1682 to reduced engine power, possible stalling and intermittent no-crank or no-start, so get it diagnosed soon even if the car runs normally now.
It gets more serious if:
- Stop: Stop driving if the engine stalls or loses power while moving; GM lists engine stall with P1682 on the Traverse, Acadia and Enclave.
This page covers only what differs on GMC. For what P1682 means, the ranked causes and the test order, see the P1682 guide.
What's different on GMC
GMCYour car
2007–2017 · Acadia
Supported by vehicle dataSame bulletins as the Traverse: battery draw on earlier models, fuse block arcing or corrosion on 2013–2017. Whether the bulletin is still current is not verified.
19NA276Status unverified
Reduced engine power and/or stall with P1682 and/or P0689
2013–2017traverse · issued · NHTSA 10170495
Repair information for reduced power or stall with P1682 and/or P0689. Also covers Buick Enclave and GMC Acadia.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
PIT5643Status unverified
P0689 and/or P1682: arcing or corrosion at the fuse block
2013–2014enclave · issued · NHTSA 10151875
Check for arcing or corrosion on terminal 51 of the X3 connector at the underhood fuse block. Also covers Acadia and Traverse.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
PIT4649BStatus unverified
SES MIL with P1682, battery draw and/or no start
2007–2013acadia · issued · NHTSA 10245303
Also covers Enclave, Outlook and Traverse.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
PIT5253AStatus unverified
Intermittent crank/no start with P1682
2014sierra-1500 · issued · NHTSA 10111867
Follow service information; replace the engine controls ignition relay if diagnostics lead there. Also covers Silverado 1500.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Sources and review
- GM PIT4649B: SES MIL with P1682, battery draw and/or no start (2007–2013 Acadia, Enclave, Outlook, Traverse)
- GM bulletin 19NA276: reduced engine power and/or stall with P1682 and/or P0689 (2013–2017 Enclave, Traverse, Acadia)
- GM PIT5643: P0689 and/or P1682, arcing or corrosion at X3 terminal 51 of the underhood fuse block (2013–2014 Enclave, Acadia, Traverse)
- GM PI1422: intermittent crank/no start in cold climate, P1682 (2011–2015 Cruze, Verano)
- GM PIT5253A: intermittent crank/no start with P1682, engine controls ignition relay (2014 Silverado 1500, Sierra 1500)
- 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