What it means
The transmission range control A circuit signal is below the expected level. The cause may be an electrical fault, but the code does not specify the wiring fault or circuit design.
At a glance
- Usually lights the check-engine light
How it works
The transmission control module monitors the signal level on transmission range control A. P07EA sets when that signal falls below the expected level; a short to ground, poor connector contact, or damaged harness may cause it, but the code does not specify the circuit design.
Common causes
Most likely first.
- Control wire shorted to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Record freeze-frame data and range-control A live data to see when the signal was low and whether it changes with selector movement.
- Inspect the range-control A harness for chafing or insulation worn through to ground, and check its connector for corrosion or poor pin contact.
- Following the manufacturer's procedure, measure the circuit signal and compare it with the manufacturer's specification.
- With power safely isolated as specified, check for a short to ground and inspect connector pins for excessive contact resistance.
- If wiring and connectors pass, test the connected range-control component and module circuit according to the manufacturer's diagnostic procedure.
Common fixes
- Repair insulation worn through where the range-control A wire contacts ground.
- Clean corroded connector pins and restore a sound terminal connection.
- Repair a confirmed shorted wire or high-resistance connection.
- Replace a faulty range-control component or repair a module circuit only after testing confirms the fault.
Can I keep driving?
Avoid driving if the transmission display disagrees with the selected range or shifts become unpredictable; stop safely if it slips or loses drive. A low range-control A signal can cause incorrect range information and may leave shifting limited.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.