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.
TCC - Drive Mode
This OSC function is used to test whether the torque converter clutch is LOCKING and UNLOCKING correctly.
The OSC functions for the TCC parameter allows the technician to choose the following:
- ON - Commands the TCC solenoid ON (100% duty cycle) to LOCK the torque converter clutch
- OFF - Commands the TCC solenoid OFF (0% duty cycle) to UNLOCK the torque converter clutch
- XXX - Cancels the OSC command for TCC and returns to normal operation
The vehicle requirements MUST BE MET when SENDING the OSC value for TCC. If the vehicle requirements are NOT MET when SENDING the OSC value, an ERROR MESSAGE will appear. When the ERROR MESSAGE is received, OSC is aborted and must be restarted. After SENDING the OSC value, if the vehicle requirements are no longer met, the ERROR MESSAGE will NOT appear, but the PCM will cancel the OSC value. The OSC value XXX may be sent anytime to cancel OSC.
The vehicle requirements for SENDING the TCC value OFF are as follows:
- Engine is RUNNING
- Gear selector is in OVERDRIVE
- Vehicle speed greater than 2 MPH
The vehicle requirements for SENDING the TCC value ON are as follows:
- Engine is RUNNING
- Gear selector is in OVERDRIVE
- Vehicle speed greater than 2 MPH
- Transmission Fluid Temperature (TFT) is between 60°F and 240°F
- Brake is OFF when vehicle is below 20 MPH
- Not an excessive load of the engine
- Not during an UPSHIFT or a DOWNSHIFT
- Engine speed is greater than 1500 RPM
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.