Powertrain, generic · Transmission
P07C4 Input/Turbine Shaft Speed Sensor C Circuit High
Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible
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.
Likely causes
Signal wire shorted to supply
Open circuit or broken wire inside the sensor
Corroded connector
Module input faulty
Symptoms
- Check engine light (GM after one trip)
- Limp mode, harsh shifts, no converter lock-up
- Adaption frozen
Repair estimate
DifficultyMediumWorkshop job
Parts and labour€120–600
Time1–4 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
input speed sensorsensor wiringtransmission control module
Related codes
References: law.cornell.edu, gsi.ext.gm.com, newtonnet.co.uk.