Various Driveability Symptoms-Malfunction Indicator Lamp (MIL) Illuminates Intermittently, DTCs Set, Blown Fuse, Engine Will Not Start (Repair Wire(s) and Reroute Harness)

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

These conditions may be caused from the engine wiring harness that connects to the underhood fuse/relay center chaffing against the transmission housing. This contact may cause a rub through to the wires enclosed in that harness, resulting in the above conditions. Damage to the harness may also result in several stored diagnostic trouble codes.

Repair any damaged wires and reroute harness to a new location. Use the procedure listed below.

1. Remove the air cleaner assembly. Refer to the Engine Controls sub-section of the Service Manual for removal procedure.



2. Disconnect the hose (1) from the secondary AIR injection check valve.
3. Position AIR hose so that it runs on the back side of the engine wiring harness. The engine wiring harness (2) should now be located in the fork of the AIR Y-pipe.
4. Connect the hose to the secondary AIR injection check valve. Install the hose protector, P/N 22664960, to the AIR hose at the location where the hose contacts the transmission. Position split in the hose protector to face the opposite of the transmission.
5. Repair any damaged wires. Refer to Wiring Repairs in the Wiring Systems sub-section of the Service Manual.
6. Install the air cleaner assembly. Refer to the Engine Controls sub-section of the Service Manual for installation procedure.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: