P07BF: Input/Turbine Shaft Speed Sensor A Circuit Low

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. P07BF is the low side: a short to ground of the input sensor. A GM bulletin for 2019 nine-speed models (Enclave, Equinox, Malibu, XT4 and others) traces intermittent P07BF/P07C0 together with P0717 to an open inside the input speed sensor.

Symptoms

• Check engine light (GM after one trip)
• Limp mode, harsh shifts, no converter lock-up
• Adaption frozen

Most likely causes

• Signal or supply wire shorted to ground (chafing at the case)
• Sensor shorted internally
• Oil or moisture in the 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. With the connector unplugged, check whether the signal wire is making contact with ground.
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 P07BF means

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

Frequently asked questions

Can I keep driving with code P07BF?

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

What causes code P07BF?

The most common causes are: signal or supply wire shorted to ground (chafing at the case); sensor shorted internally; oil or moisture in the connector.

Related codes

• P07C0Input/Turbine Shaft Speed Sensor A Circuit High
• 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
• P077COutput Shaft Speed Sensor Circuit Low
• 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.