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2008 chev 2500 diesel no crank and park indicator not let…

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2008 chev 2500 diesel no...
2008 chev 2500 diesel no crank and park indicator not let and when had it running the only gauge that worked was volt gauge and programmer wouldnot communcate
Submitted: 4 months ago.Category: Chevy
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Answered in 8 minutes by:
3/21/2018
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,694
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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This definitely sounds like a communication issue within the truck. Gauge info, park/neutral info, starting info all comes over this data circuit, so I think you have the basic diagnosis pretty much down: there's a problem with the communication circuits.

This can be a bad module or a wiring issue. It will require a good scan tool (OEM quality, Snap On, etc) to query the modules in the truck and try to get to the bottom of it. I'm not sure this is a very DIY friendly sort of diagnosis, is this something you want to try to get into?

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Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

OK, you'll need a good scan tool, do you have that?

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Customer reply replied 4 months ago
snap on
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

OK, go into the truck and query all of the controllers, do a DTC check on the whole vehicle, and see what it reports.

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Customer reply replied 4 months ago
will not communacat with scanner
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

OK. Let me do some homework on this, we're going to have to take apart the communication circuits and see if we can isolate modules.

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Customer reply replied 4 months ago
ok thank you
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

There are two different data buses on this truck. Door modules, HVAC, cluster, theft deterrent are some of the low speed bus modules. Can you communicate with any of these?

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Customer reply replied 4 months ago
no
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

The key is on? Do you have power at all of the fuses that should have power on them (with the exception of headlight, crank, etc.)?

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