What it means
The input/turbine shaft speed sensor C circuit signal is above the expected range.
At a glance
- Usually lights the check-engine light
How it works
Input/turbine shaft speed sensor C provides speed information used by the control module to manage transmission operation. This code sets when sensor C's circuit signal exceeds its expected high-side range, which may indicate a short to a voltage source.
Common causes
Most likely first.
- Signal wire shorted to reference voltage
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
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
- Read freeze-frame and live data to check sensor C speed and when its signal rose above the expected range.
- Inspect sensor C's connector and wiring for pinched insulation, corrosion, loose pins, or contact with a powered circuit.
- Use the wiring diagram to check the C signal for a short to reference voltage or battery voltage and inspect its connections.
- Check whether sensor C reports a plausible changing speed as the shaft turns using available scan data or the vehicle's service procedure.
- If the harness is intact, test sensor C and the control module input against the manufacturer's specification.
Common fixes
- Secure or clean sensor C's connector if its contacts are poor.
- Repair a signal wire shorted to reference voltage or battery power.
- Replace pinched or damaged wiring in the sensor C circuit.
- Replace input/turbine shaft speed sensor C if its output remains high.
- Repair the transmission control module input circuit if testing isolates the fault there.
Can I keep driving?
Avoid heavy loads and limit driving if shifts are harsh, delayed, or slipping. Stop and arrange a tow if the transmission cannot shift predictably, since continued driving can cause further damage.
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.