With 4L80E Transmission

Torque Converter Clutch (TCC) Stuck "ON":

Trans Component Slipping:

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) commands the Torque Converter Clutch (TCC) Pulse Width Modulated (PWM) solenoid "ON" by modulating TCC signal fluid acting on the converter clutch shift valve. Then TCC apply fluid applies the torque converter clutch.

DIAGNOSTIC TROUBLE CODE (DTC) 69 WILL SET WHEN
- No DTC(s) 21, 22,28, 71, 74 are set.
- TCC slip speed RPM indicates between -5 and +10.
- TCC solenoid is commanded "OFF"
- Throttle Position (TP) sensor signal is greater than 25%.
- Trans range switch indicates D3 or D4.
- Commanded gear indicates 2nd or 3rd gear.
- All conditions are met for 2 seconds.

DTC 69 WILL CLEAR WHEN
Fault condition no longer exists and the ignition switch is cycled "OFF" then "ON."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This test checks for proper throttle position sensor operation.
2. This test checks the mechanical state of the TCC. When the PCM commands the TCC solenoid "OFF," TCC slip speed should increase.

DIAGNOSTIC AIDS
If the TCC is mechanically stuck "ON," vehicle speed is zero, brakes are applied, and D2 is selected, the TCC fluid will mechanically apply the TCC causing an engine stall.
Scan TP signal while depressing accelerator pedal with engine "OFF" and ignition "ON." Display should vary from below 0.85 volt when the throttle is closed to over 4.0 volts when the throttle is held at wide open throttle. Incorrect TP sensor values may affect TCC operation.