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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC MD Steel Tilt (F Model) 🢒 Bulletins 🢒 Service Engine Soon Lamp On, Malfunction Indicator Lamp (MIL) Illuminates Intermittently, DTC Set, Blown Fuses, Engine Will Not Start (Repair Wire(s))

Service Engine Soon Lamp On, Malfunction Indicator Lamp (MIL) Illuminates Intermittently, DTC Set, Blown Fuses, Engine Will Not Start (Repair Wire(s))

Subject:Service Engine Soon Lamp On, Malfunction Indicator Lamp (MIL) Illuminates Intermittently, DTC Set, Blown Fuses, Engine Will Not Start (Repair Wire(s))

Models:1997-2002 Chevrolet and GMC F Model (T Series) Medium Duty Tilt Cab Models
With Isuzu 7.8L Diesel Engine (VIN 3 -- RPO LG4) or Caterpillar® 3126 Diesel Engine (VIN C -- RPO LG5)
1997-2002 Isuzu FSR/FTR/FVR Medium Duty Commercial Vehicles
With 6HK1-TC Engine


Condition

Some customers may comment on one or more of the following conditions:

    • Intermittent MIL/Service Engine Soon indicator illuminated
    • Anti-Lock Brake System Warning Light illuminated
    • Engine will not start or stalls after start up
    • Various electrical system failures
    • Blown fuses

Cause

The front chassis harness chaffing near the left cab support may cause these conditions. The harness is routed through the wheelhouse near the left front tire. Abrasive debris and water enters the harness and over time may wear through the insulation of the wires enclosed in the harness.

Correction

Inspect and repair any damaged wires. Use the procedure listed below.


    Object Number: 853795 Size: SH
  1. Remove both p-clips securing the suspected harness (1) to the frame.
  2. Inspect the harness for damage by opening the conduit at the top (just below branch) and follow the wires all the way down to the frame. Damage normally occurs at the low point where the harness loops around the bottom of the frame.
  3. Clean away as much debris as possible and repair any damaged wires. Refer to Wiring Repairs in the Wiring Systems sub-section of the Service Information.
  4. Wrap the outside of the plastic conduit from branch to frame with 3M® Electrical Moisture Sealant Tape, P/N 06147, or equivalent to prevent future damage.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

N6600

Wiring and/or Connector, Brake System/Traction Control -- Repair

Use published labor operation time