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Related Medium and Heavy Trucks Questions
Does a 2000 model 379 Pete have a 9 pin diagnostic port for
Does a 2000 model 379 Pete have a 9 pin diagnostic port for the abs system? … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
430 satisfied customers
The engine fan will not come on automatically when water
The engine fan will not come on automatically when water temp gets high under a load. The fan works when I turn on manual switch and the fan works with the high pressure side of A/C. this is a C-16 en… read more
Cat Man
Cat Man
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Vocational, Technical or Trade Scho
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Clearance lights will not turn off. 2001 Peterbilt 379 Cat
had to pull the relay to turn lights off and the relay was hot … read more
Jackie Dempsey
Jackie Dempsey
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Automotive and Diesel Engines
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Peterbilt c15 trying to start on its own. It fried starter.
Peterbilt c15 trying to start on its own. It fried starter. Ive replaced it still doing the same.… read more
Scott Anthony
Scott Anthony
Master Technician
HS Diploma
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I have a 98 379 that the fan wont kick on after an inframe
I have a 98 379 that the fan wont kick on after an inframe new water pump, thermostats, new sensors. On the computer it says fan is constantly on … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
430 satisfied customers
Have 1992 379 peterbilt shop ecently replace old wiring.
Have 1992 379 peterbilt shop ecently replace old wiring. Everything dash signal all work but started down road everything goes out all dash everything trailer lights. Could it be ground or … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
I have a 1999 peterbilt when I turn the ignition switch off
I have a 1999 peterbilt when I turn the ignition switch off it only shuts off engine and stereo, heater and low oil pressure warning do not turn off … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
430 satisfied customers
I have a 2003 Peterbilt 379 cab and it keeps burning out the
I have a 2003 Peterbilt 379 cab and it keeps burning out the brake light switch … read more
Kent Van Wagner
Kent Van Wagner
40 satisfied customers
I have a 99 379 peterbilt that is throwing a # 25 code. It​
I have a 99 379 peterbilt that is throwing a # 25 code . It​ has a series 60 Detroit. What is causing it to throw that code #? … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
430 satisfied customers
What style plug is the connector for diagnostics on a 1992
what style plug is the connector for diagnostics on a 1992 peterbilt with a detriot engine??. i believe ddec 2... its a rectangle plug not a round plug like newer trucks... i need to see what its call… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,059 satisfied customers
I have a 2005 Peterbilt 379 c-15 Acert which seems to have
Hi, I have a 2005 Peterbilt 379 c-15 Acert which seems to have an ignition problem. As of yesterday I walked outside to begin my pre-trip and as I approached the truck I could hear the low air pressur… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,059 satisfied customers
C12 in 2000 peterbilt engine fan wont come even in manual
c12 in 2000 peterbilt engine fan wont come even in manual mode but light in dash works with switch just no fan ..unplugged air valve for fan fan starts on right away … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,059 satisfied customers
1994 Peterbilt 379 with 60 series Detroit diesel- The brake
1994 Peterbilt 379 with 60 series Detroit diesel- The brake lights only come on if I step on the brakes real hard. If I am using the brakes to slow down not stepping on them hard, they do not come one… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
207 satisfied customers
My blower motor runs on its own when I start my truck I
My blower motor runs on its own when I start my truck I pulled the bunk fuse now I can work my cab controls but my ac don't kick on 2004 peterbilt 379 exhd… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
Morning Jim,When the key is first turned on the 379 it lights
Morning Jim, When the key is first turned on the 379 it lights the dash bright then, they go out after about three seconds. Is there anyway of making the dash lights stay on when the headlights and Pa… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
I was installing a new refrigerator in a 2004 Peterbilt 379,
I was installing a new refrigerator in a 2004 Peterbilt 379, and when I turned on the switch for the refer, I lost all my can interior (not dash) lights and radio. All the fuses are good. What am I mi… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
peterbilt 1990 379 day cab, 3406 ac problems, I have power
peterbilt 1990 379 day cab, 3406 b ac problems, I have power to dash switch through relay on fuse block, fan in cab turns on , blows ok. have power in to high pressure for ac fan switch for big motor,… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,059 satisfied customers
On my 2003 peterbilt 379 when I put my lights on high beam
On my 2003 peterbilt 379 when I put my lights on high beam I've got high beam only on driver side and low beam on passenger side. I've replaced turn signal/dimmer switch. Same results.… read more
JCTech
JCTech
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Vocational, Technical or Trade Scho
352 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

5,059 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

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I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

4,023 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

cumminsdr

cumminsdr

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All types of Cummins applications

Curtis B.

Curtis B.

Technician

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Technician turned service manager on multiple lines of trucks and engines, used in industry.

Chris (aka-Moose)

Chris (aka-Moose)

Technician

353 satisfied customers

24 years of experience diagnosing & repairing

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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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