What does code P1631 mean?

Q: What does code P1631 mean?

Anti-Theft Password Incorrect / O2 Sensor Slow Response. This code sets when the body control module (BCM) or theft deterrent module (TDM) receives an incorrect password from the engine control module (ECM) during the anti-theft handshake, or when the ECM detects that the upstream oxygen sensor is responding too slowly to changes in exhaust oxygen content. The computer has either failed to authenticate a module on the serial data bus or logged a slow-response fault from the oxygen sensor circuit.

DTC codes / GM codes / P1631

P1631 · GMAnti-Theft Password Incorrect / O2 Sensor Slow Response

This code sets when the body control module (BCM) or theft deterrent module (TDM) receives an incorrect password from the engine control module (ECM) during the anti-theft handshake, or when the ECM detects that the upstream oxygen sensor is responding too slowly to changes in exhaust oxygen content. The computer has either failed to authenticate a module on the serial data bus or logged a slow-response fault from the oxygen sensor circuit.

SystemPowertrain

Code typeGM specific

SeverityHigh

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.