What it means
The transmission range multi-function select circuit signal is below the expected level. The code does not specify the circuit design or exact electrical fault.
At a glance
- Usually lights the check-engine light
How it works
The transmission range select circuit carries the selector position signal to the control module. P07EF sets when that signal is lower than expected; a short to ground, chafed wiring, or a poor connector contact can pull it down.
Common causes
Most likely first.
- 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 compare the scan-tool range reading with the selected position to see when the low signal appears.
- Inspect the range select harness along its route for chafing, crushed sections, or insulation worn through to ground.
- Check the range switch or sensor connector for corrosion, damaged pins, or a loose connection that could add resistance.
- Using the wiring information for the vehicle, test the select circuit for an unintended short to ground and check continuity through the harness.
- Measure the circuit signal at the sensor and at the control module while changing selector positions, comparing readings with the manufacturer's specification.
- If the signal is correct at the module connector but the fault remains, check the module circuit using the vehicle's diagnostic procedure.
Common fixes
- Repair chafed wiring and restore its insulation and routing.
- Clean or replace corroded or damaged connector terminals.
- Repair a select wire shorted to ground.
- Replace a range switch or sensor only if its output remains low with a verified circuit.
- Repair a confirmed control module circuit fault after verifying its wiring.
Can I keep driving?
If the range display is wrong, shifts are abnormal, or the transmission enters limp mode, avoid driving until the signal fault is checked; the selected gear may not be recognized correctly. Continued driving with slipping or erratic shifts can increase transmission wear.
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.