P07BFInput/Turbine Shaft Speed Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Check engine light (GM after one trip)
- Limp mode, harsh shifts, no converter lock-up
- Adaption frozen
- Likely causes
- LikelySignal or supply wire shorted to ground (chafing at the case)
- PossibleSensor shorted internally
- PossibleOil or moisture in the connector
- RareModule input faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €120 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.