P07C0: Input/Turbine Shaft Speed Sensor A 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. Low means a short to ground, high a short to supply or, depending on the circuit, an open. GM's transmission modules from 2019 (9-speed, 10-speed) flag below 0.25 V or above 4.75 V – a short of under 0.5 Ω – for more than 0.05 s with the system above 10 V for 5 s, after one trip. P07C0 is the high side: a short of the input sensor signal to supply. GM's 2019 nine-speed bulletin lists it together with P07BF and P0717 and traces it to an open inside the sensor.

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.

1. Check the fluid level and condition
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Read the input and output speed in live data
4. Check the connector and wiring
5. Check for other related engine codes
6. Consult the manufacturer's procedure for the transmission

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P07C0 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 7: Transmission
• C0: Specific fault in that system

Frequently asked questions

Can I keep driving with code P07C0?

Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.

What causes code P07C0?

The most common causes are: signal wire shorted to supply; open circuit or broken wire inside the sensor; corroded connector.

Related codes

• P07BFInput/Turbine Shaft Speed Sensor A Circuit Low
• P0715Input/Turbine Shaft Speed Sensor A Circuit
• P0716Input/Turbine Shaft Speed Sensor A Circuit Range/Performance
• P0717Input/Turbine Shaft Speed Sensor A Circuit No Signal
• P077DOutput Shaft Speed Sensor Circuit High
• P0700Transmission Control System (MIL Request)

Sources

• gsi.ext.gm.com: 25OBDG03A
• gsi.ext.gm.com: 20OBDG03A Diagnostics
• gsi.ext.gm.com: 19OBDG03B Diagnostics
• static.nhtsa.gov: MC 10154616 9999

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.