What it means
Voltage on the TCC pressure control solenoid control line is below the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
How it works
The torque converter clutch (TCC) pressure control solenoid controls hydraulic pressure for converter lockup. The transmission control module monitors the solenoid control line; this code sets when voltage falls below the expected window, which can result from a short to ground or a shorted solenoid coil.
Common causes
Most likely first.
- Control wire shorted to ground
- Internal short in solenoid coil
- Connector pins corroded - high contact resistance
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Check freeze-frame and live data to confirm the TCC solenoid circuit low condition and when it occurs.
- Inspect the solenoid connector and harness for chafed insulation, a wire contacting ground, corrosion, moisture, or damaged pins.
- Wiggle the harness while watching the circuit status to see whether movement changes the low signal.
- Check the control wire for a short to ground and inspect the solenoid coil for an internal short, following the vehicle's wiring information.
- Compare circuit and coil test results with the manufacturer's specification to identify whether the wiring, connector, or solenoid is at fault.
Common fixes
- Repair a control wire shorted to ground.
- Repair chafed insulation or damaged wiring in the TCC solenoid circuit.
- Repair corroded or damaged solenoid connector terminals and seals.
- Replace the TCC pressure control solenoid if its coil is shorted and the wiring is sound.
Can I keep driving?
Avoid towing and demanding driving if the transmission shifts harshly, shudders, or slips. Stop if it cannot shift safely, since a low solenoid circuit signal can interfere with TCC pressure control and increase transmission wear.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.