P07A0
Transmission Friction Element G Slip Detected.
- Generic
- Powertrain
- Generic code
- High severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 7
- AreaTransmission
- A0
- FaultThe specific fault in that area
What it means
P07A0 is a generic powertrain code meaning the transmission control module has detected slip in friction element G, which is one of the clutches or brakes used to engage gears. It sets when the measured input and output speeds, or the calculated gear ratio, differ from the expected ratio while that element should be fully applied. Which physical clutch or brake is 'G' depends on the manufacturer and transmission, so the exact component must be confirmed for the specific model.
Symptoms
- Engine revs rising without matching acceleration during a gear change or under load
- Delayed, harsh or flared gear changes
- Transmission warning light or malfunction indicator lamp on
- Car dropping into limp mode and holding a fixed gear
- Burning smell from the transmission or dark, burnt fluid
- Loss of drive in one or more gears
Possible causes
- Low or incorrect transmission fluid level, or fluid that is degraded or contaminatedlikely
- Worn friction material on the affected clutch or brake packlikely
- Low or erratic hydraulic pressure from a faulty pressure control or shift solenoidpossible
- Valve body wear, sticking valves or internal fluid leaks between circuitspossible
- Faulty input or output speed sensor giving a false slip reading, or damaged wiring or connectorspossible
- Blocked filter or weak pump reducing line pressurerare
- Outdated transmission control software where the manufacturer has issued a fix for this faultrare
How to diagnose
- Read all stored and pending codes and the freeze frame data to see gear, speed, load and fluid temperature when the fault set
- Check for related codes such as solenoid, speed sensor or other slip codes, as they can point to the root cause
- Check the transmission fluid level and condition using the correct procedure for that model, looking for a burnt smell, dark colour or metallic debris
- Inspect the wiring and connectors to the transmission, speed sensors and solenoids for damage, corrosion or fluid ingress
- Compare live input and output speed sensor data against engine speed and road speed to confirm real slip rather than a sensor fault
- Monitor commanded versus actual gear ratio and clutch adaptation values during a road test to identify the gear in which slip occurs
- Carry out a line pressure test and solenoid checks following the manufacturer procedure for the transmission
- Check for any applicable software updates or technical bulletins for the model and transmission
How to fix
- Correct the fluid level and replace the fluid and filter with the specification the manufacturer calls for, if the fluid is degraded
- Repair or replace faulty speed sensors, wiring or connectors
- Replace the faulty pressure control or shift solenoid, or the valve body, if testing shows it is the cause
- Overhaul or replace the transmission if the friction element is worn or internal leakage is confirmed
- Update the transmission control software only if a known fault with the existing calibration is confirmed for that model
Can I keep driving?
Avoid driving beyond what is needed to get the car safely to a workshop, as continued slip quickly burns the clutch material and can cause costly internal damage. If the car is in limp mode or slipping noticeably, stop driving and have it recovered.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.