P07C4 code meaning
Input/Turbine Shaft Speed Sensor C Circuit High
Powertrain system Generic code P07xx codes Check engine light
What P07C4 means
These low/high codes are a purely electrical check of the sensor's signal voltage at the module and run even with the vehicle at rest – unlike the circuit, range, no-signal and intermittent codes, which evaluate speed while driving. Low means a short to ground, high a short to supply or, depending on the circuit, an open. No manufacturer document available to us uses this code, and no production transmission with a third input speed sensor was found. The expected logic follows GM's sensor A check (above 4.75 V); the remaining codes for sensor C are P07F1 ff.
P07C4 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P07C4
- Check engine light (GM after one trip)
- Limp mode, harsh shifts, no converter lock-up
- Adaption frozen
Common causes of P07C4
- Most likelySignal wire shorted to supply
- PossibleOpen circuit or broken wire inside the sensor
- PossibleCorroded connector
- Less likelyModule input faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Input speed sensorSensor wiringTransmission control module
What each part of P07C4 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| C4 | The exact fault in that area. |
What to do next
- Note P07C4 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P07C4
What does P07C4 mean?
P07C4 means "Input/Turbine Shaft Speed Sensor C Circuit High". These low/high codes are a purely electrical check of the sensor's signal voltage at the module and run even with the vehicle at rest – unlike the circuit, range, no-signal and intermittent codes, which evaluate speed while driving. It is a generic code, so it means the same on every make.
Is it safe to drive with P07C4?
Drive gently and only to a workshop. With P07C4 the car can go into limp mode (reduced power) to protect itself.
Will P07C4 fail an emissions test?
Yes, it can. P07C4 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P07C4 to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P07C4 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.