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, 7.4 NREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 6.5L DIESELDIAGNOSTIC TROUBLE CODE CHARTSDTC 45, EGR VENT ERRORNOTES
1995 GMC Suburban K2500, 7.4 N
DTC 45, EGR Vent Error: Notes
1995 GMC Suburban K2500, 7.4 NSECTION Notes
When PCM recognizes operating range for no EGR, PCM energizes EGR vent solenoid which allows rapid venting of EGR vacuum. This solenoid is normally open. DTC 45 will set when:
- Ignition voltage is present on EGR vent control circuit when EGR vent is commanded on.
Or
- No ignition voltage is present on EGR vent control circuit when EGR vent is commanded off.
PCM will default to shut off EGR system.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This step determines if DTC 45 is result of a hard failure or an intermittent condition.
- This step checks if PCM and wiring are okay.
- This step checks power and control circuits.
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.