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 69, TCC Stuck On (4L80-E): Notes
1995 GMC Suburban C1500, 6.5 FSECTION Notes
PCM commands TCC PWM solenoid on by modulating TCC signal fluid acting on converter clutch shift valve. Then TCC apply fluid applies torque converter clutch. DTC 69 will set when:
- DTCs 21, 22, 28, 71 or 74 are not set.
- TCC slip speed indicates -5-10 RPM.
- TCC solenoid is commanded off.
- TP sensor signal is greater than 25 percent.
- Trans. range switch indicates D3 or D4.
- Commanded gear indicates 2nd or 3rd gear.
- All conditions are met for 2 seconds.NOTE: Test numbers refer to numbers on diagnostic chart.
- This test checks for proper throttle position sensor operation.
- This test checks mechanical state of TCC. When PCM commands TCC solenoid off, TCC slip should increase.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.