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I have a 2014 Peterbilt 389 with c15 cat glider. Have a

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I have a 2014...

I have a 2014 Peterbilt 389 with c15 cat glider. Have a j1939 engine code. But the trucks runs good. Have no gauges working. So I suspect the engine ecm is good and cat told me that it’s not the engine ecm

Mechanic's Assistant: What is the complete model and serial number of your machine?

389k peterbilt. 1NPXGGGG8OD246608

Submitted: 1 year ago.Category: Medium and Heavy Trucks
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Answered in 11 minutes by:
8/4/2021
Technician: Daniel Wilson,
 replied 1 year ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 15,140
Experience: Owner at DJ Wilson
Verified

Hi, My name is***** will be glad to try to help. We can follow up as needed on here. Professionals are not employees of the site but users of the site and help on here as time allows depending on their daily schedule.Sorry to hear you're having these troubles with this truck. If the engine ECM is confirmed good with 100% certainty, you must keep in mind that this is a multiplex electrical system where all of the control modules on the truck are programmed to communicate with one another. A loss of datalink communication could be the result of multiple different potential causes. There could be a problem within the wiring or connector pins causing a short or open circuit, faulty terminating resistor within the wiring harness, loss of power or ground to a control module, faulty control module, software related glitch or problem requiring reprogramming from the dealer, faulty instrument cluster or CECU by Paccar terminology. I hope you find this information helpful. Reply back with the results of these checks if any further help is needed. It is a pleasure to help anyway I can.

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Customer reply replied 1 year ago
I also have ground from ecm and node having 9 volts. Ground for lights have 9 volts. Have gone through all wires for rubbing. None found. Checked all grounds and all cables. New Starter. New batteries. 2 weeks in shop with no luck. All lights work and drives and operates normal except for gauges and dash never turns off
Technician: Daniel Wilson,
 replied 1 year ago
Sometimes when these things happen, it may require another set of hands and eyes physically on this while also obtaining and referencing the electrical schematics.
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Daniel Wilson
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Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 15,140
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