Question about 2003 Pontiac Grand Prix

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Code u1040 03 pontiac gp - 2003 Pontiac Grand Prix

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Hi, if you are receiving a u1040 code ,the car needs to be put on a good scanner to see which module is not communicating this includes the pcm-ebcm-bcm-sir/sdm-ipc-radio and the pass key 111, you need to check the battery hots, ignition hots ,grounds and serial data lines to each module if the scanner cannot communicate with any of the modules, the serial data line will have a very low amount of voltage and will be moving between low voltages check all the fuses and relays battery connections and grounds, the ignition relay is a good one to check, also for the antitheft reprogram relearn there is a 30 minute relearn process ;;try to start the vehicle and release the key do not turn it off wait ten minutes until the security light goes out then turn the key off for 5 seconds and turn the key back on wait 10 more minutes for the light to go off again turn the key off for 5 seconds and then back on for 10 minutes more after the light goes off turn the key off for 5 seconds and now try to start the car, if it still doesn’t start then check for any connections under the hood for water damage or critter damage.

Take care

Posted on Aug 06, 2010

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