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 138 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 5.7L.)MISCELLANEOUS ECM/PCM/VCM CONTROLSTRANSMISSION (C-8)CONVERTER LOCK-UP SIGNAL AT TRANSMISSION
1995 GMC Suburban K2500, 6.5 F
Converter Lock-Up Signal At Transmission
1995 GMC Suburban K2500, 6.5 FSECTION Converter Lock-Up Signal At Transmission
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 1996 GMC Yukon, 1996 GMC Vandura Special, 1996 GMC Vandura, 1996 GMC Suburban, and 1996 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.
- Warm engine to operating temperature. Raise vehicle and support drive wheels. Support suspension where necessary to prevent damage to drive axles.
- Disconnect converter clutch connector at transmission. Connect a test light across converter clutch harness terminals. See Figure. Start engine and place transmission in Drive. Accelerate vehicle to 45 MPH and note test light.
- If test light is not on, check solenoid power supply wire of harness for open or short to ground. Check ground circuit for open between harness connector and ECM/PCM/VCM. If harness is okay, see CONVERTER LOCK-UP SIGNAL FROM ECM/PCM/VCM below.
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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.