2003 Chevy  Monte Carlo. I replaced the PCM with a new one. had it programed and did the relearn procedure twice, car still will not start. When I did the relearn no telltale signs of the security showed.I put a PCM in from a different car and I can start the car but no gas gauge and trans shift points all wrong. When I did the relearn on used pcm the ringer went off the entire time, but no ringer with new computer. PLEASE HELP THANKS.

 

Answer: You did not specify the reason for the PCM replacement. Was it to fix a no start problem?
Assuming the new PCM was a new factory, and not an aftermarket, and it is the correct part number, the theft system and indicator is controlled by the BCM, not PCM. The chime should not be on when relearning theft system- this is also controlled by the BCM. Sounds like you have a BCM problem, or a more common problem with the theft system- the Passlock sensor / ignition cylinder.


Shift points are controlled by PCM with what is called "Adapts". Basically it learns the way you drive to set shift points for best shift. A new, or used computer would need time to relearn shift points. A used computer may not have same programming for your car, which can cause all sorts of problems.

 


Be Social With Us !

Leave your comments

Post comment as a guest

0
    • No comments yet.

    Latest Articles

    How to turn radiator fans on ...

    I have a 2006 Chrysler town & country van, I'm trying to add refrigerant to the air conditioner but ...

    2015 Ford F-150 Door Panel ...

    How do you remove the door panel from a 2015 F-150 Crew Cab? I am looking at the front passenger ...

    2006 Silverado Bogs Down Code ...

    I have a 2006 Silverado 5.3 and the check engine light recently came on showing code p0442. I have ...

    plate lights 99 chevy blazer

    Changed the bulbs on my plate lights and they still dont work. All my other lights work except my ...

    Login Or Register

    Log In Or Register
    ? The Benefits

    How Things Work

    Baisic Starting System Function and Operation

    The cranking circuit consists of the battery, starter motor, ignition switch, and related wiring.

    These starter motors are not serviceable and are replaced as assemblies only.

    Most of today's starter motors are non-repairable starter motors. They have pole pieces that are arranged around the armature within the starter housing. When the solenoid windings are energized, the pull-in winding circuit is completed to ground through the starter motor.

    Read more...

    Common Engine Codes

    Knock Sensor Codes P0325 and P0327

    The powertrain control module (PCM) contains integrated knock sensor (KS) diagnostic circuitry. The KS produces an AC voltage at all engine speeds and loads. The PCM then adjusts spark timing based on the amplitude and frequency of the KS signal.

    Read more...