P0715
Input/Turbine Shaft Speed Sensor A Circuit.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 7
- AreaTransmission
- 15
- FaultThe specific fault in that area
What it means
P0715 is the generic code for a fault in the input/turbine shaft speed sensor 'A' circuit in an automatic transmission or CVT. The transmission control unit compares the input shaft speed signal with engine speed and other speed signals. It sets the code when the signal is missing, erratic or implausible. Sensor location and the exact set conditions vary by model and gearbox.
Symptoms
- Malfunction indicator lamp or transmission warning lamp on
- Gearbox in limp mode, often stuck in one gear
- Harsh, delayed or flared gear changes
- Erratic or non-working speedometer or rev counter
- Torque converter lock-up not engaging, with higher fuel consumption
- Transmission shifts at the wrong times or not at all
Possible causes
- Faulty input/turbine speed sensorlikely
- Damaged, chafed or corroded wiring or connector between the sensor and the control unitlikely
- Metal debris or contamination on the sensor tip or reluctor from worn gearbox internalspossible
- Low, degraded or contaminated transmission fluid affecting sensor readings and operationpossible
- Damaged or worn sensor reluctor ring or drumpossible
- Internal transmission fault such as a slipping clutch or torque converter problem causing implausible speed readingsrare
- Faulty transmission control unit or software issue, where a known fault exists for that modelrare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting speed, gear and fluid temperature when the fault set
- Check for other related codes such as output speed sensor, engine speed or gear ratio faults, which point towards a common cause
- Check the transmission fluid level and condition as per the manufacturer's procedure, looking for burnt smell, debris or contamination
- Inspect the sensor wiring and connector for chafing, heat damage, water ingress, corrosion and bent or pushed-back pins
- Compare live data for input shaft speed, engine speed and output speed while driving or on a lift, checking the input signal is smooth and plausible
- Test the sensor circuit for supply, earth and signal continuity, and check the sensor resistance or signal output against the manufacturer's specification
- Remove the sensor if accessible and inspect the tip for metal particles, damage or incorrect fitment
- Check for any manufacturer service bulletins or software updates relevant to the model and gearbox
How to fix
- Repair or replace damaged wiring and clean or renew corroded connectors
- Replace the faulty input speed sensor and clear the codes, then confirm the fault does not return
- Correct the fluid level or change the transmission fluid and filter using the specified type, where fluid is the cause
- Clean the sensor and replace a damaged reluctor ring or related components if they are worn
- Investigate and repair internal transmission faults if the speed readings are implausible and wiring and sensor are proven good
- Update the transmission control unit software only where an outdated calibration is a known cause for that model
Can I keep driving?
Medium severity
The car can usually be driven carefully to a workshop, but limp mode and poor shifting mean it should be fixed soon. Continued driving with slipping or harsh shifts can damage the gearbox, so avoid heavy loads and long journeys.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.