What it means
A fault was detected in the transmission mode switch D circuit.
At a glance
- Usually lights the check-engine light
How it works
Transmission mode switch D is an input that tells the transmission control module about a mode or selector state, where that switch input is used. P07CE indicates a fault in the switch D circuit, but the code alone does not identify whether the signal is open, shorted, or otherwise implausible.
Common causes
Most likely first.
- Faulty transmission mode switch or selector
- Open or shorted switch wiring
- Loose, damaged, or corroded connector
- Fault in the transmission control module input circuit
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 check scan-tool data for transmission mode switch D while selecting the available modes to identify missing or implausible state changes.
- Locate switch D and inspect its connector, selector mechanism, and harness for looseness, corrosion, damaged pins, or chafing.
- With live data displayed, gently move the switch D harness and connector to check whether the reported state changes intermittently.
- Use the wiring diagram to test switch D's circuit for opens or shorts and verify terminal continuity through the selector's range of movement.
- If the switch and wiring test correctly, check the transmission control module input circuit against the manufacturer's specification.
Common fixes
- Secure a loose switch D connector and clean corroded terminals.
- Repair an open, shorted, or chafed section of switch D wiring.
- Repair damaged connector pins or a faulty selector linkage affecting the switch input.
- Replace the transmission mode switch or selector assembly if its D circuit fails testing.
Can I keep driving?
If the selector state is recognized and shifting is normal, drive cautiously to a repair location. Avoid relying on uncertain mode selection; stop if the vehicle selects an unexpected gear, shifts harshly, or slips.
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.