Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Aids
1995 GMC Suburban K2500, 6.5 FSECTION Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 1996 Chevrolet Chevy Van, 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Sonoma, and 1995 GMC Safari. However, it is still accessible from the selected car via links, so may be relevant.
Verify a clean, tight connection for sensor ground. An open circuit at sensor signal terminal or ground terminal will result in a Code 13.
CODE 13 TERMINAL & CIRCUIT WIRING IDENTIFICATION
| Application | ECM/PCM Terminal | Wire Color | ||
|---|---|---|---|---|
| "C" & "K" Series | ||||
| 4.3L | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||
| "G" Series | ||||
| 4.3L A/T | ||||
| Oxygen Sensor Signal | A10 | Purple | ||
| Oxygen Sensor Ground | A12 | Tan | ||
| "L" & "M" Series | ||||
| 4.3L | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||
| "P" Series | ||||
| 4.3L | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||
| "S" & "T" Series | ||||
| 4.3L (VIN W) Pickup & A/T Utility | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||
| 4.3L (VIN Z) A/T Pickup | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.