2015 Chevrolet Silverado 6.6L Harness Damage
Posted to Technical Tips Forum on 12/20/2015
6 Replies
A Product Information Report (PIR) has been submitted
identifying the condition described below, that may or may
not exist on just this particular truck or others of the
same build. A simple repositioning and tightening of a loose
cable tie strap, may prevent the need for a subsequent
repair on other vehicles.
The vehicle is a 2015 Chevrolet Silverado HD 4WD truck with
6.6L Duramax engine and Allison 6 speed automatic
transmission combination. The truck was donated to our
program by GM for training and has 10 km accumulated through
plant and delivery.
Opening the hood to survey the engine compartment for the
first time, the Transmission Control Module (TCM) electrical
harness was found to be contacting the serpentine accessory
drive belt. [TCM harness to serpentine belt contact]
[Harness Chafed]
Further inspection of the harness revealed that the conduit
was rubbed through [2015 Chevrolet Silverado 2500 HD LT,
Photo] and the insulation was chafed through on one wire
in the harness, leaving the conductor bare, but otherwise
undamaged. [Conductor Insulation Rub Through]
Looking at the harness routing, the harness runs next to the
engine harness at the left front of the engine and should
make a high rise upwards before looping down under the upper
radiator hose to make connection at the TCM, which is
fastened to the radiator fan shroud.
A single cable tie was found loose at the base of where the
engine and TCM harnesses are located. [2015 Chevrolet
Silverado 2500 HD LT, Transmission Photo]
After repairing the wiring, conduit and re-affixing the
label [2015 Chevrolet Silverado 2500 HD LT, Transmission
Photo] the original cable tie was repositioned to maintain
the TCM harness securely and routed with sufficient
clearance from the drive belt. Moving the cable tie upwards
about 3.5" did the job. [2015 Chevrolet Silverado 2500 HD
LT, Transmission Photo]
Before fully securing the cable tie, clearance was verified
and also that the harness loop to the TCM did not put the
TCM connector terminals under stress from being at a too
severe angle. Sufficient clearance and routing allows for
engine movement without harness damage. [Secure
Harness]
With the harness re-positioned and clearance to the drive
belt verified [2015 Chevrolet Silverado 2500 HD LT,
Transmission Photo] the cable tie was secured and the two
harnesses taped together for added security.
Whether this might be an isolated incident or a common
concern, if you service customer vehicles with this
powertrain set up, it might be worth checking that the TCM
harness is properly secured to prevent any need for a
subsequent wiring repair.
Regards,
Martin from British Columbia
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