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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29427
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 2003 chevy 3500, that's got a P0802 code, abs,

Customer Question

Customer: Good afternoon, I have a 2003 chevy 3500, that's got a P0802 code, abs, brake and no shift indication. wont attempt to start because it doesn't know its in park, happen the other day driving down road. trans derated and would only shift 1 2 3 all same lights, 1 mile latr cleared itself and good last 2 dys, today shut truck off and when I went to restart same problem. I installed a new trans control module on side of trans no change 8.1 liter with ***** ***** trans
JA: Thanks. Can you give me any more details about your issue?
Customer: P0802 code, abs lite,brake light no shifting indicator will not start
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Submitted: 11 months ago.
Category: Chevy
Customer: replied 11 months ago.
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Expert:  GM Tech (Cam) replied 11 months ago.

Hi there, I am Cam. There are a couple other things this could be. It could be a bad contact in the ignition switch (very common), possibly wiring or ground and connections. Knowing this, I would consider changing the ignition switch as they are cheap, 35-40 for an AC Delco one (document attached) and then check the wiring as outlined.

Check the vehicle for a possible weak battery or a dead battery in dual battery applications. Also check for possible poor battery cable connections, poor grounds, UBEC connections, or possibly an ignition switch dropping out during crank.