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 (4L60-E): Notes
PCM energizes TCC solenoid by grounding TCC control circuit with an internal quad-driver. When grounded (energized) by PCM, TCC solenoid stops converter signal oil from exhausting. TCC solenoid will de-energize when quad-driver no longer provides a ground. When TCC solenoid is de-energized, it will block exhaust fluid and release TCC. DTC 69 will set when:
- DTCs 21, 22 or 28 are not set.
- TCC slip speed indicates -20-20 RPM.
- TCC solenoid is commanded off.
- TP sensor signal is greater than 25 percent.
- Trans. range switch indicates D3 or D4.
- Commanded gear indicates 3rd or 4th gear.
- Engine speed is greater than 300 RPM.
- All conditions are met for 4 seconds.
PCM will default to early shift pattern.
- This test checks mechanical state of TCC. When PCM commands TCC solenoid off, TCC slip speed should increase.
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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.