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03 gmc 2500hd 6.0 gas. truck is going crazy

Driver side door ajar warning randomly comes on, doors lock and unlock by themself while driving down the road. idle sometimes drops to around 300 when switching drives. when door ajar light comes on, the dome light wont go off and i have to cover it when passing cars. any suggestions?!

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Check door switch connection and operation.
If the door switch is part of the door lock mechanism, within the door itself, then remove door panel, disconnect the mechanism's electrical connector and re-check that the interior light no longer comes on with that door ajar. If it doesn't, then you likely have a faulty door lock mechanism, which you will have to replace.
This faulty switch will also have the affect on your random central locking function.


This is not likely connected to the engine performance issue.

Posted on Nov 04, 2012

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Posted on Jan 02, 2017

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  • 10 Answers

SOURCE: my door ajar comes on sometimes when door is not ajar

There is a magnet type sensor in the door jamb and door that come together when you close the doors.You have to replace the magnet switch in the door that it is bad in. these newer model Fords are notorious for those particular switches going bad

Posted on Mar 28, 2009

  • 20 Answers

SOURCE: keeps trying to lock doors,

The "BCM" module on your van has become unreliable.
The BCM is the "Body Control Module" that all these systems go through. The issue is that these are cold soldered and after a time the solder joints break on the computer connection. It is located behind the fusebox underneath the steering wheel.
If you know someone who can solder. You can use an 8mm and a 10mm socket to remove the BCM. Open it up and resolder the joints with a soldering iron. After that everything should be fine.
It is easier than it sounds.

BODY CONTROL MODULE
REMOVAL
Disconnect battery negative cable.
Remove lower steering column cover and knee blocker reinforcement.
Disconnect two wire connectors from bottom of Body Control Module (BCM) Body Control Module .
Remove bolts holding junction block (fuse Panel) to dash panel mounting bracket.
Remove junction block from mounting bracket.
Remove screws holding BCM to junction block.
Slide BCM downward to disengage guide studs on junction block from channels on BCM mounting bracket.
Remove BCM from junction block.
Re-solder Main connection points
INSTALLATION
Reverse the preceding operation.

Posted on May 08, 2009

  • 91 Answers

SOURCE: My door ajar light stays on sometimes while

spray the door latch with WD - 40 on both doors then open and close multiple times. Sometimes they get stuck ond this help if they free up once a month should keep it away

Posted on Apr 27, 2009

alicantecoli
  • 22219 Answers

SOURCE: My 2004 Suburban warns that the driver door is

sensor switch in door pillar

Posted on Jan 25, 2010

walleyracing
  • 76 Answers

SOURCE: 2003 Jetta Door ajar light keeps coming on and

You need to replace the door jamb switch. Little button on the door jamb that is pressed in when doors are shut.

Posted on May 03, 2010

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