Diagnostic Aids

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the wiring for poor electrical connections at the TCM and powertrain control module (PCM). Inspect for the following conditions:
- A bent terminal
- A backed-out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire
- A broken wire inside the insulation
When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
You may have to drive the vehicle in order to experience a condition.
If P0875, previously P1713, is shown in failure records as being set first on the failure list followed by P0872, previously P1711, combined with P0708, this generally indicates a PNP internal switch failure. Often, when the DTCs are cleared, they do not return. This may be due to moisture that was present at the time the DTC was set, causing a short internally.
Inspect the PNP switch linkage carefully for proper adjustment and for signs of damage.