What does code P1629 mean?

Q: What does code P1629 mean?

Anti-Theft Divide Cranking Signal. P1629 on GM vehicles means the body control module (BCM) or theft deterrent module has detected a problem with the anti-theft divide cranking signal, which is the coded message that authorizes the powertrain control module (PCM) to allow engine cranking. The computer has either not received the correct signal from the theft deterrent system or has seen a voltage or timing condition on the cranking circuit that does not match the expected secure value.

DTC codes / GM codes / P1629

P1629 · GMAnti-Theft Divide Cranking Signal

P1629 on GM vehicles means the body control module (BCM) or theft deterrent module has detected a problem with the anti-theft divide cranking signal, which is the coded message that authorizes the powertrain control module (PCM) to allow engine cranking. The computer has either not received the correct signal from the theft deterrent system or has seen a voltage or timing condition on the cranking circuit that does not match the expected secure value.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyProfessional

AreaComputer and output circuits

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.