Powertrain, generic · Transmission

P07BF Input/Turbine Shaft Speed Sensor A Circuit Low

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. 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.

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

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

P07C0P0715P0716P0717P077CP0700

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.