P07C0

What it means

P07C0 is a generic powertrain code meaning the transmission control module has detected a voltage or signal level that is too high in the input/turbine shaft speed sensor A circuit. The module monitors this sensor's signal against expected limits and against other speed inputs such as output speed and engine speed. If the signal sits above the expected range, the code is stored and the transmission may use a default strategy.

Symptoms

• Gearbox warning light or malfunction indicator lamp on
• Transmission stuck in one gear (limp mode)
• Harsh, delayed or flared gear changes
• Erratic or non-working speedometer or rev-related gauges on some models
• Torque converter lock-up not engaging or shuddering
• Reduced fuel economy

Possible causes

• Damaged wiring, such as a short to voltage on the sensor signal or supply wirelikely
• Corroded, loose or contaminated sensor connector or transmission harness connectorlikely
• Faulty input/turbine shaft speed sensorlikely
• Metallic debris on the sensor tip or damaged or incorrect reluctor/tone ringpossible
• Fault in the transmission control module or its internal circuitryrare
• Outdated control unit software where a manufacturer bulletin covers this faultrare

How to diagnose

1. Read all stored codes and freeze frame data, noting vehicle speed, gear and temperature when the code set, and check for related speed sensor or communication codes
2. Check the transmission fluid level and condition, as the correct level and clean fluid matter and metal debris can affect the sensor
3. Visually inspect the sensor wiring and connectors for chafing, heat damage, fluid ingress, bent pins and corrosion
4. View live data for input speed, output speed and engine speed and check whether the input reading is implausible or stuck high
5. Check the sensor circuit for short to voltage, open circuit and resistance against the manufacturer's wiring diagram and specifications, as pin layout and values depend on the model and gearbox
6. Test the sensor's supply and signal at the connector with the ignition on and while the sensor is turning, following the model-specific procedure
7. Remove the sensor if accessible and inspect the tip for debris, damage and correct fitting, and check the tone ring where access allows
8. Check for applicable software updates or technical bulletins for the specific vehicle and gearbox

How to fix

• Repair or replace damaged wiring and clean or replace faulty connectors
• Replace the input/turbine shaft speed sensor if it fails testing, using the correct part for the gearbox
• Clean debris from the sensor and correct the fluid level or service the fluid if contamination is found
• Repair or replace a damaged tone ring or related internal components if inspection shows a fault
• Update the transmission control module software only where an outdated calibration is a known cause for that model
• Repair or replace the transmission control module only after wiring and sensor faults have been ruled out

Can I keep driving?

Nearby codes

• P07BFGenericInput/Turbine Shaft Speed Sensor A Circuit Low
• P07C1GenericInput/Turbine Shaft Speed Sensor B Circuit Low