P1632 BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC, SATURN: THEFT DETERRENT START DISABLE SIGNAL RECEIVED
POST UPDATED IN May, 2023
P1632 BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC, SATURN: THEFT DETERRENT START DISABLE SIGNAL RECEIVED
The Immobilizer Module or Vehicle Theft Deterrent Module (VTD) sends the password to enable the ignition to the Engine Control Module (ECM) via a serial data circuit. After the password is received, the ECM challenges the password and works with the immobilizer controller to perform a calculation on the challenge. If the calculated response from the immobilizer module is equal to the ECM‘s calculation, the ECM will allow the vehicle’s engine to start. On the other hand, if the enable password is invalid, there will not be communication with the immobilizer module or a fuel disable password will be sent from the immobilizer, the ECM will disable the vehicle starting.
The setting of the P1632 OBDII diagnostic code is carried out when the calculated response of the immobilizer module does not match the calculation performed by the ECM.
Reasons to set the P1632 OBD2 fault code:
To troubleshoot the DTC P1632 OBDII, try this: