How does the BCM work on a GMC Truck?
In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM. If this password matches the password stored in the PCM, the system enables fuel delivery.
Do you have to relearn a BCM code?
If you have this code, then the vehicle probably is equipped with a BCM, and you must perform a relearn. The next section applies only to those vehicles that use a BCM. For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process.
How does the BCM learn the resistance of a key?
For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process. In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM.
How to relearn the crankshaft position sensor?
The Crankshaft Position Sensor Relearn procedure requires the use of a scan tool that has this feature equipped. The scan tool will walk the installer through the procedure. Some of the steps to be expected are: Apply and hold brake Note: Some applications will be instructed NOT to hold brake pedal. Follow instructions on scan tool.
In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM. If this password matches the password stored in the PCM, the system enables fuel delivery.
If you have this code, then the vehicle probably is equipped with a BCM, and you must perform a relearn. The next section applies only to those vehicles that use a BCM. For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process.
For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process. In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM.
The Crankshaft Position Sensor Relearn procedure requires the use of a scan tool that has this feature equipped. The scan tool will walk the installer through the procedure. Some of the steps to be expected are: Apply and hold brake Note: Some applications will be instructed NOT to hold brake pedal. Follow instructions on scan tool.