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2003 GMC 1500 all wheel drive and steer. had AAA jump start.

Customer Question
2003 GMC 1500 all...

2003 GMC 1500 all wheel drive and steer . had AAA jump start. Now gauges , AC and rear steer don"t work. truck starts and runs, Have ABS light and others on dash.

Mechanic's Assistant: Have you checked the fuses? The dashboard bulbs?

Yes

Mechanic's Assistant: Are you fixing your 2500 yourself? What have you tried so far?

No. trucks in shop, hes a very good mech. I was told a MINI fuse. cant locate,

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No. trucks got 60000. was a gift. way ahead of its time . want to fix it correctly

Submitted: 1 month ago.Category: GMC
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Customer reply replied 1 month ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 1 month ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 1 hour by:
3/18/2018
GMC Mechanic: JFN1, ASE Certified Technician replied 1 month ago
JFN1
JFN1, ASE Certified Technician
Category: GMC
Satisfied Customers: 5,628
Experience: GM Master Technician
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I would be looking to see if there is power on all of the fuses. Notorious problem on this truck is the ignition switch, which would drop a whole circuit when the switch fails, and this circuit usually affects gauge operation, HVAC operation, and occasionally transmission operation/cause a check engine light, but all of these symptoms don't necessarily go together.

I like to use a test light and just touch the tops of all the fuses to see that they all have power, and that they all have power on both pins of each fuse (fuse is good, not burned). This takes just a few moments and removes a lot of guessworks.

Is your mechanic getting any useful scan data, trouble codes, etc?

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Customer reply replied 1 month ago
truck runs . no respond from scan . no reply at all. I have had problems with key and position recently during shut off. also a clicking sound while driving near fuse box. if I turn off ignition stop problems. window control at loose and have just recently malfunctioned. All symptoms match. what needs to be replaced and who is the right person to do it. good mech or dealership ?
Thanks Billy
GMC Mechanic: JFN1, ASE Certified Technician replied 1 month ago

I would pick "good mechanic" over dealership, simply because going to the dealership isn't a guarantee of getting a good mechanic. Certainly, dealers have the resources, but they also have their share of less than best mechanics.

Jump starting does funny things to computers. I don't know if your guy has done this yet, but when there has been a power disruption followed by computer weirdness (which is what you have) I always start with disconnecting both battery cables from the battery, and touching the ends together for several seconds. This will remove any logic lockup issues, which are pretty common when you have unstable battery voltage.

From that point, I'd get into the class 2 data circuits. Why is the ECM not communicating, but the engine runs? That doesn't make sense, you'd think that if the ECM was dead, the engine wouldn't start, so obviously the ECM isn't dead. It's just the communication circuit that's being affected. Any computer on the network can bring down the communications, a good scan tool (read: GM Tech 2 or equivalent) is necessary to really get into this vehicle's systems and see which computer is mucking up the works.

If your mechanic is good with this sort of thing, let him have at it. What part of the country are you in? Perhaps I can refer you to someone.

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Customer reply replied 1 month ago
I'm located in Santa Barbara Ca. The key tumbler has just started to act up. Believe it left ignition on over night. I have a appointment Monday at Paradise Chevy. I just like to know more about a problem. I build old cars, but this one is got to many bells I hope they bring back all wheel 4 steering. This truck work the landslides in Montecito last months. great truck.
GMC Mechanic: JFN1, ASE Certified Technician replied 1 month ago
I think your dealer appointment sounds perfect. 4 wheel steering just never really caught on. It was an expensive option. I’ve heard nothing from GM about bringing it back, seemed to not be in high enough demand. Sounds like a great truck, I love those trucks.
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GMC Mechanic: JFN1, ASE Certified Technician replied 1 month ago

Did you get this worked out?

Please take a moment to rate my answers using the stars at the top of the page, that's how I get compensated. Let me know if you need anything else, I am happy to follow up.

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