Envoy 2WD V8-5.3L VIN P (2004)
Engine Control Module: Description and Operation
Theft Deterrent
POWERTRAIN CONTROL MODULE
The powertrain control module (PCM) contains the remainder of the logic of the theft deterrent system. If a class 2 message containing a valid password
is received from the BCM, the PCM will continue to allow the fuel injectors to operate. The PCM will allow the fuel injectors to operate until it decides
there is no valid password coming from the BCM. If the PCM does not receive a class 2 message, or receives a class 2 message with an incorrect
password, the engine will crank and will not run or will start and stall immediately.
