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.
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HOMESERVICE MANUALSGMC1995SUBURBAN K2500, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 121 (ENGINE CONTROLS - TESTS W/CODES - 2.2L)TROUBLE CODE CHARTSCODE 45, RICH EXHAUST INDICATIONEGR PROBLEM
1995 GMC Suburban K2500, 6.5 F
EGR Problem
1995 GMC Suburban K2500, 6.5 FSECTION EGR Problem
WARNING: This page is about a different car, the 1995 GMC Sonoma and 1995 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
EGR valve sticking open at idle is usually accompanied by a rough idle and/or stalling. If Code 45 is intermittent, see INTERMITTENTS in TESTS W/O CODES - GASOLINE article.
CODE 45 TERMINAL & CIRCUIT WIRING IDENTIFICATION
| Application | PCM Terminal | Wire Color |
|---|---|---|
| Oxygen Sensor Signal | A10 | Purple |
| Oxygen 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.