P07C6
Intermediate Shaft Speed Sensor A Circuit High.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 7
- AreaTransmission
- C6
- FaultThe specific fault in that area
What it means
P07C6 is a generic powertrain code meaning the transmission control module has seen the signal voltage from intermediate shaft speed sensor A sitting higher than expected. This usually points to an open circuit, a short to voltage or a faulty sensor, and the module can no longer trust the shaft speed reading. The sensor location and number of intermediate shafts depend on the transmission design.
Symptoms
- Gearbox warning light or engine management light on
- Transmission in limp mode or stuck in one gear
- Harsh, delayed or flared gear changes
- Erratic or non-working speedometer or rev readings on some models
- Reduced performance or poor fuel economy
- Torque converter lock-up or clutch operation disabled
Possible causes
- Faulty intermediate shaft speed sensor A giving a high or out-of-range signallikely
- Damaged, chafed or broken wiring causing an open circuit or short to voltage in the sensor signal or supply linelikely
- Corroded, loose or contaminated connector at the sensor or transmission harness pluglikely
- Transmission fluid contamination with metal debris affecting the sensor signal (on sensors exposed to fluid)possible
- Damaged or incorrectly fitted sensor, air gap or reluctor ring fault (depends on transmission design)possible
- Fault in the transmission control module or an outdated calibration known for this code on the specific modelrare
How to diagnose
- Read all stored codes and freeze frame data, noting vehicle speed, gear and temperature when the fault set, and check for other speed sensor codes
- Check the transmission fluid level and condition, as the correct level and spec matter for sensors that sit in the fluid
- Visually inspect the sensor wiring and harness for chafing, heat damage, fluid ingress and rubbing points
- Inspect and disconnect the sensor and transmission connectors, checking for bent pins, corrosion, moisture and fluid in the plug
- Using live data, compare intermediate shaft speed with input and output shaft speed and see whether the reading is stuck high or erratic
- Check supply, signal and ground circuits against the manufacturer wiring diagram for open circuits or shorts to voltage, and measure the sensor resistance or output to specification
- Remove the sensor if accessible and examine it for metal debris, damage and the condition of its mounting and air gap
- Check for manufacturer technical bulletins or calibration updates for this model before replacing the control module
How to fix
- Replace the intermediate shaft speed sensor A if it fails testing
- Repair or replace damaged wiring and fix any short to voltage or open circuit
- Clean, repair or replace faulty connectors and ensure they are fully seated and sealed
- Correct the fluid level or change the fluid and filter if contaminated, and investigate the source of any debris
- Refit or replace a damaged sensor or reluctor component as found
- Update the transmission control module software only if a known fault or outdated calibration applies, or replace the module if confirmed faulty
Can I keep driving?
The car can usually be driven carefully for a short time, but limp mode and harsh shifts can stress the transmission, so have it diagnosed soon. Avoid heavy loads and long journeys, and stop if shifting becomes severe or the gearbox slips.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.