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.
DTC 67, TCC Solenoid Circuit Fault (4L60-E): Notes
1995 GMC Suburban K2500, 7.4 NSECTION Notes
Ignition voltage is supplied directly to TCC solenoid. PCM controls solenoid by providing ground path through TCC control circuit. DTC 67 will set when:
- PCM commands solenoid on and voltage remains high (B+) for 2 seconds.
- PCM commands solenoid off and voltage remains low (zero volts) for 2 seconds.
PCM will default to no TCC and no 4th gear in hot mode.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This test checks PCM's ability to control solenoid.
- This test checks power supply to TCC solenoid.
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.