Question about 2003 Pontiac Montana
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Posted on Jan 02, 2017
Check to see if security light on dash is on after turning key to on/start position and letting dash lights run dianosis.(after 10 to 15 seconds). Pontiac uses a security theft system which shuts-down fuel injectors when a different key is used or the Body Control Module thinks the car is being stolen. Pontiac designed this so the owner would have to bring the vehicle back to the dealer. My Grand Am did this and it cost me alot, just to have the dealer reset it.( took them 5 min.) You may have to re-learn the pcm and bcm. It's the same as the dealer re-setting them. The proceedure is (1) turn the key to the on/start position and leave there for 12 minutes.
(2) turn the key to the off position for 30 seconds.
Repeat steps 3 times.
After that the car should start.
I know this is a hassle, but it's a lot cheaper than taking it to the dealer. Hope this helps.
Posted on Sep 15, 2011
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