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P07A6

Transmission Friction Element C Performance/Stuck Off.

  • Generic
  • Powertrain
  • Generic code
  • High severity

How this code is built

P
SystemPowertrain
0
Defined bySAE, the same on every car
7
AreaTransmission
A6
FaultThe specific fault in that area

What it means

P07A6 means the transmission control unit has detected that friction element C (a clutch or brake pack inside the automatic gearbox) is not engaging when commanded and is behaving as if stuck off. The control unit saw input and output shaft speeds, or the calculated gear ratio, that did not match the gear it requested, which points to slip or lack of drive. Which physical clutch or brake is 'element C' depends on the gearbox design, so this varies by make and model.

Symptoms

  • Engine revs rise without matching acceleration (flare or slip) in one or more gears
  • Gearbox fails to engage a particular gear or drops into neutral-like behaviour
  • Harsh, delayed or erratic shifts
  • Gearbox goes into limp mode, often stuck in one gear
  • Warning light on the dashboard, possibly with a gearbox fault message
  • Burning smell from the transmission fluid in more severe cases

Possible causes

  • Low, degraded or contaminated transmission fluid reducing clutch apply pressurelikely
  • Worn or burnt friction plates in element C, causing sliplikely
  • Faulty shift solenoid or pressure control solenoid feeding element Clikely
  • Valve body wear, sticking valves or internal hydraulic leaks, including worn seals on the clutch pistonpossible
  • Wiring or connector fault between the transmission control unit and the solenoid or speed sensorspossible
  • Faulty input or output speed sensor giving a false slip readingpossible
  • Fault within the transmission control unit or outdated calibration known for this issue on the specific modelrare

How to diagnose

  1. Read all stored codes and freeze frame data to see gear, speed, temperature and load when the fault set, and note any related solenoid or speed sensor codes
  2. Check the transmission fluid level and condition (colour, smell, debris) following the procedure for that gearbox, as some are sealed and need a specific temperature check
  3. Inspect the transmission wiring harness and connectors for damage, corrosion, chafing and fluid ingress
  4. Check for relevant technical service bulletins or calibration updates for the specific model and gearbox
  5. Use live data to compare commanded gear with input and output shaft speeds and watch for slip in the affected gear
  6. Check solenoid resistance and operation against the manufacturer specification, and test speed sensor signals
  7. Carry out a line pressure test where the model allows, to find hydraulic or clutch pack problems
  8. Inspect the fluid pan for excess friction material or metal particles before deciding on internal work

How to fix

  • Correct the fluid level or replace degraded fluid and filter with the specified type
  • Repair or replace damaged wiring, connectors or terminals
  • Replace the faulty solenoid or speed sensor
  • Repair or replace the valve body or worn seals as diagnosed
  • Overhaul or replace the gearbox if element C or other internal parts are worn or burnt
  • Apply an updated transmission control unit calibration only if the manufacturer lists it as a fix for this fault

Can I keep driving?

High severity

Avoid driving beyond what is needed to get the car to a workshop, as continued slip can quickly burn the clutch pack and cause costly gearbox damage. If the gearbox is in limp mode or slipping badly, have the car recovered.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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