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Related Medium and Heavy Trucks Questions
I got a 27 code on my C15. I changed the sensor, the harness
I got a 27 code on my C15. I changed the sensor, the harness and the gauge still bouncing … read more
Nich1019
Nich1019
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Vocational, Technical or Trade School
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I have a 07 387 Peterbilt with a Eaton Fuller 10 speed
Hello I have a 07 387 Peterbilt with a Eaton Fuller 10 speed automatic trans. I had a tractor protection valve replaced now when pressing the brake to select a gear it will not go to geta … read more
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Justin
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Vocational, Technical or Trade School
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Jake brake stopped working on our 2002 Peterbilt 379. It's
Jake brake stopped working on our 2002 Peterbilt 379 … read more
Nich1019
Nich1019
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Vocational, Technical or Trade School
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04 peterbilt 379 with c15. Engine fan won't come on unless I
04 peterbilt 379 with c15 . Engine fan won't come on unless I do it manually with the switch in the dash … read more
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Nich1019
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I'm working on a 2005 Peterbilt 379 vin. *****************
I'm working on a 2005 Peterbilt 379 vin. ***************** caterpillar 6NZ76707. The cruise control isn't working found the service brake is showing it's depressed. I'm just needing to see if you can … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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Engine brake won't work on low setting. Has new harness
Engine brake won't work on low setting. Has new harness inside valve cover. I manually powered them and they work. No codes. … read more
Nich1019
Nich1019
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Cruise will not work. 05 peterbilt 379 cat accert c 15.
Cruise will not work JA: What's the make/model/year of your truck? Engine type? Customer: 05 peterbilt 379 cat accert c 15 JA: Are you fixing your truck yourself? What have you tried so far? Customer:… read more
Nich1019
Nich1019
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I already paid my subscription I need some more help. On the
Okay I already paid my subscription I need some more help … read more
Mike Mcmillan
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Where do I find the Peterbilt 379 brake pressure switch for
where do I find the Peterbilt 379 brake pressure switch for cruise control … read more
Nich1019
Nich1019
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Trying to locate fuse for brake lights 2007 peterbilt 387.
Trying to locate fuse for brake lights 2007 peterbilt 387 … read more
BrentR718
BrentR718
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I have a truck that's a peterbilt 379 with a cat c15 and
I have a truck that's a peterbilt 379 with a cat c15 and Jake brakes are not working on it when I turn the switch on nothing happens when I supply direct power my jake brakes work it electrical has no… read more
Cat Man
Cat Man
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I have a 2005 peterbilt 379 with a cat acert C15 in it the
I have a 2005 peterbilt 379 with a cat acert C15 in it the blower motor will not work on any speed I have gotten the multimeter out and started checking when I go to any point in the system be at the … read more
Andy
Andy
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My engine fan will not turn on. Either with the manual
My engine fan will not turn on. Either with the manual switch or just letting the ecm do it by water temp. I've replaced the fan air solenoid and it still will not engage. Unless I cut the wires to th… read more
Cat Man
Cat Man
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Vocational, Technical or Trade Scho
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Jake brakes wont work. 2003 pete 379 c15. Cat told me to
yes, cat told me to unplug the two wire connector to the micro switch and use a jumper wire to see if the jakes started working if they did then we would know the micro switch was bad well we did that an still no jakes … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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07 c15 379 Peterbilt, has code 385-3. Is this any easy
07 c15 379 Peterbilt, has code 385-3. Is this any easy sensor fix ? If so where is it located … read more
Cat Man
Cat Man
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On a 2005 387 peterbilt C15 cat i lost jake brakes
On a 2005 387 peterbilt C15 cat i lost jake brakes and cruise Do you have a wiring diagram of this circuit?… read more
Wayne
Wayne
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Vocational, Technical or Trade Scho
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Yesterday my speedometer, odometer, voltage gauge and
Yesterday my speedometer, odometer, voltage gauge and instrument light cluster stopped working. Checked fuses and relays in fuse box as well as relay directly behind gauges. Could not resolve the prob… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
14,844 satisfied customers
2003 peterbilt 387 for the past couple weeks my cruise control
2003 peterbilt 387 for the past couple weeks my cruise control has been going on and off now it doesn't work at all I by passed sensor on clutch pedal (no go) pulled of on clutch and brake pedal ( no … read more
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Meet the Experts:

Daniel Wilson

Daniel Wilson

14,844 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,353 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

5,115 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

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ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

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Curtis B.

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cumminsdr

cumminsdr

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All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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