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2003 GMC Sierra Questions & Answers
Code P0442 2003 GMC Sierra
Are you located somewhere cold? some vehicles will not allow the evap to run its cycle under cold conditions, you shouldnt have to drive more than 180 miles, but you might have too. If you can take it to a heated garage and run it it might help
GMC 2003 1500 HD Crew Cab, Door ajar light goes
Who looked at it ? Dealer ? Did the place's you had look at the vehicle hook up a factory scan tool an view data to door module's an the BCM ? Door ajar is a fuction of the door modules an the BCM - body control module . One of these modules is seeing an input that makes it think door is open .
The door ajar indicator system consists of the following components:
• The driver door module (DDM)
• The passenger front door module (PDM)
• The body control module (BCM)
• The instrument panel cluster (IPC)
• The driver information center (DIC)
• The driver door ajar switch
• The passenger door ajar switch
• The left rear door ajar switch
• The right rear door ajar switch
• The liftgate ajar switch
Driver Door Ajar And Passenger Door Ajar
The DDM and PDM receive a discrete input from the respective door ajar switch to indicate the status of the door. The DDM or PDM then communicates this status to the IPC via class 2 message. The IPC, upon receipt of this class 2 message, will illuminate the appropriate door ajar message in the DIC and also send a class 2 message to the radio to activate the door ajar audible warning when the following conditions are met:
• The transmission is removed from PARK
• The vehicle speed is greater then 8.05 km/h (5 mph)
Left Rear Door Ajar And Right Rear Door Ajar
The BCM receives a discrete inputs from both the left and right rear door and liftgate ajar switches to indicate the status of the doors and liftgate. The BCM then communicates this status to the IPC via class 2 message. The IPC, upon receipt of this class 2 message, will illuminate the appropriate door ajar message in the DIC and also send a class 2 message to the radio to activate the door ajar audible warning when the following conditions are met:
• The transmission is removed from PARK
• The vehicle speed is greater then 8.05 km/h (5 mph)
Could have DTC'S - diagnostic trouble codes . Looking at data paramiters on the scan tool tool would show what switch is faulty or what part is .
I have a 2003 GMC
Check the throttle position sensor it is used to adjust the idle when the engine is cold. The ECT switch by the thermostat outlet will sometimes send the wrong signal to the computer and tell the engine the temp is higher than what it is and that can also cause problems. Hope this helps. I would also check the cat and muffler and be sure the exhaust is not restricted. If it is then back pressure will not allow fuel to be drawn into the cyl. properly. Put your hand on the exhaust pipe and it can give you and idea if the exhaust is partially plugged or restricted. Hope this helps.
2003 GMC sierra 2500, rear directions faintly light but they speed up when I brake, brake lights dont work, back up lights dont work. When I break it looks like the four way flashers are on. Front ok
Well, it sounds like a ground problem to me. If a ground problem, it can cause some weird things to happen. See the rear junction block, I'd check those grounds. Because those grounds are connected, ground wire is black, it looks like hunting a needle in a haystack. In the diagram, the top wires should be voltage and bottom wires ground. I guess you could try a separate redundant ground, at rear, for lamp/s? Click on the comment link.
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