Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
If DTC C0870 is present, perform the diagnosis for that DTC first.
The following conditions may cause a malfunction to occur:
- An open in the 5 volt reference circuit of the air pressure sensor.
- A short to ground in the 5 volt reference circuit of the air pressure sensor.
- An open in the signal circuit of the air pressure sensor.
- A short to ground in the signal circuit of the air pressure sensor.
- An open in the low reference circuit of the air pressure sensor.
- A malfunction in the air pressure sensor.
- A leak in the air tube at the air pressure sensor may cause a faulty sensor voltage reading.