OBD-II code · Powertrain (generic)
P07CD Transmission Mode Switch C Circuit High
Transmission mode switch C input reads stuck high — short to battery voltage. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P07CD?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySwitch wire shorted to battery voltage
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Transmission Mode Switch C
Related codes
- P071CTransmission Mode Switch A Circuit High
- P071FTransmission Mode Switch B Circuit High
- P078FTransmission Mode Switch C Circuit
- P07D0Transmission Mode Switch D Circuit High
- P07D3Transmission Mode Switch E Circuit High
- P07D6Transmission Mode Switch F Circuit High
- P07CAIntermediate Shaft Speed Sensor C Circuit High
- P07CBTransmission Fluid Thermostat Performance
- P07CCTransmission Mode Switch C Circuit Low
- P07CETransmission Mode Switch D Circuit
- P07CFTransmission Mode Switch D Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.