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 MANUALSGMC1995C3500 HD 6.5 F, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 74 (ENGINE CONTROLS - TESTS W/CODES - BODY CONTROL COMPUTER)
1995 GMC C3500 HD 6.5 F, Automatic
Section 74 (Engine Controls - Tests W/Codes - Body Control Computer)
1995 GMC C3500 HD 6.5 F, AutomaticSECTION Section 74 (Engine Controls - Tests W/Codes - Body Control Computer)
WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Module Location
- Self Diagnostic Tests
- Notes
- Test 1A - Trouble Codes
- Test 2A - Blank Scan Tool Message Screen
- Test 7A - Short To Battery
- Test 7B - Short To Battery
- Test 7C - Short To Battery
- Test 7E - Short To Battery
- Test 7F - Short To Battery
- Test 8A - Short To 5 Volts
- Test 8B - Short To 5 Volts
- Test 8E - Short To 5 Volts
- Test 8F - Short To 5 Volts
- Test 8G - Short To 5 Volts
- Test 9A - Short To Ground
- Test 9B - Short To Ground
- Test 10A - Bus + & Bus - Shorted Together
- Test 14A - Not Receiving Bus Messages Correctly
- Test VER-1 - Verification Procedure
- Wiring Diagrams
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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.