OBD-II code · Powertrain (generic)
P07C9 Intermediate Shaft Speed Sensor C Circuit Low
Intermediate shaft speed sensor C (third intermediate sensor in heavy-duty or hybrid-coupled transmissions) signal voltage below the lower limit.
Is it safe to drive with P07C9?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness 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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Intermediate Shaft Speed Sensor C, Sensor Wiring
Related codes
- P07C5Intermediate Shaft Speed Sensor A Circuit Low
- P07C7Intermediate Shaft Speed Sensor B Circuit Low
- P07C6Intermediate Shaft Speed Sensor A Circuit High
- P07C8Intermediate Shaft Speed Sensor B Circuit High
- P07CAIntermediate Shaft Speed Sensor C Circuit High
- P07CBTransmission Fluid Thermostat Performance
- P07CCTransmission Mode Switch C Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.