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. Intermediate shaft sensor B is a further sensor on a countershaft or planetary element. No manufacturer document available to us uses this code; GM reports further 10-speed intermediate sensors under its own codes. The expected logic follows the other sensors (above about 4.75 V); the speed-based codes for sensor B are P2745–P2748.
Medium severity. Can I keep driving?Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
Symptoms
- Check engine light (GM after one trip)
- Limp mode, harsh shifts, no converter lock-up
- Adaption frozen
Most likely causes
- Signal wire shorted to supply
- Open circuit or broken wire inside the sensor
- Corroded connector
- Module input faulty
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P07C8 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 7: Transmission
- C8: Specific fault in that system
Frequently asked questions
Can I keep driving with code P07C8?
Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
What causes code P07C8?
The most common causes are: signal wire shorted to supply; open circuit or broken wire inside the sensor; corroded connector.
Related codes
- P07C7Intermediate Shaft Speed Sensor B Circuit Low
- P2745Intermediate Shaft Speed Sensor B Circuit
- P2746Intermediate Shaft Speed Sensor B Circuit Range/Performance
- P2747Intermediate Shaft Speed Sensor B Circuit No Signal
- P2748Intermediate Shaft Speed Sensor B Circuit Intermittent
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.