P07E4
Unable to Engage Park.
- Generic
- Powertrain
- Generic code
- High severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 7
- AreaTransmission
- E4
- FaultThe specific fault in that area
What it means
P07E4 is a generic powertrain code meaning the transmission control system was unable to engage Park when it was commanded. The control unit requested Park, usually through the selector or a park button, but the park actuator, position feedback or related signals did not confirm that Park had engaged. Exact detection logic and hardware depend on the vehicle and transmission type.
Symptoms
- Selector or park button seems to select Park but the car may not hold on a slope
- Warning message on the dash about Park, transmission or shift fault
- Transmission warning light or general fault light on
- Car may roll when stopped or when the engine is switched off
- Unable to remove the key or switch off normally, depending on model
- Unable to select a drive gear, or the gear indicator flickers or shows no position
Possible causes
- Faulty park actuator, park motor or parking pawl mechanism (on shift-by-wire or electrically actuated systems)likely
- Low or unstable supply voltage, or poor earth to the transmission control unit or actuatorlikely
- Damaged wiring or poor connector contact at the actuator, position sensor or selector modulepossible
- Faulty transmission range or park position sensor giving feedback that does not match the commandpossible
- Selector, shift lever or park button assembly fault, or a mechanical cable or linkage out of adjustment where fittedpossible
- Hydraulic or internal transmission fault, or a mechanical fault with the parking pawl, that stops Park engagingrare
- Outdated or faulty control unit software where the manufacturer has identified it as a known causerare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting gear selected, vehicle speed and battery voltage when the fault set
- Check the battery condition and charging voltage, and fix any low-voltage problem before going further, as it can set many related codes
- Inspect the wiring and connectors at the selector, park actuator, range sensor and transmission control unit for damage, corrosion, water ingress or loose pins
- Check the power and earth supplies to the transmission control unit and actuator against the manufacturer's wiring diagram
- Compare the commanded and actual park or range position in live data while operating the selector, and check for other selector or gear position codes
- Perform an actuator or output test if the vehicle supports it, and listen and feel for the actuator operating
- Check any shift cable, linkage or selector adjustment on mechanically linked systems
- Look up manufacturer service bulletins and software updates for the specific model and transmission before condemning parts
How to fix
- Repair or replace damaged wiring, connectors or earth points found during testing
- Replace the park actuator or park mechanism if it fails testing, following the model-specific procedure
- Replace the range or park position sensor, or the selector assembly, if it gives faulty or inconsistent signals
- Correct low battery voltage or charging faults, and replace the battery if it cannot hold charge
- Adjust or repair the shift linkage or cable where fitted
- Update the control unit software only where a manufacturer-approved update addresses this fault, and carry out any required adaptation or relearn
Can I keep driving?
High severity
Avoid driving if Park may not hold, as the car could roll away when parked. If you must move it, use the handbrake or electric parking brake every time and chock the wheels on a slope, then get it checked promptly.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.