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Home / DTC / P0907 — Gate Select Position Circuit A High

P0907 — Gate Select Position Circuit A High

Detailed page for trouble code P0907.

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Code

P0907

Generic P — Powertrain

Gate Select Position Circuit A High

Brand: Generic
Type: P — Powertrain
Views: UK: 20 EN: 43 RU: 27
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Page language: EN

Causes

  • Short to battery voltage on Gate Select Position Circuit A
  • Corroded, bent, or damaged connector pins at the sensor/actuator or module
  • Chafed or damaged wiring harness causing contact with a power source
  • Faulty gate select position sensor or solenoid (internal short or open)
  • Poor or missing ground connection in transmission harness or module
  • Control module (TCM/PCM) internal driver failure

Symptoms

  • Check Engine / MIL lamp illuminated
  • Transmission fault indication or reduced transmission performance (limp mode)
  • Inability to select gears or incorrect gear selection
  • Harsh, delayed, or erratic shifting
  • Stored transmission-related trouble codes or multiple related circuit codes

What to check

  • Retrieve freeze-frame and live data with a scan tool; confirm P0907 and note conditions when it set
  • Visual inspection: wiring harness, connectors, and transmission harness routing for damage or chafing
  • Inspect connector pins for corrosion, bent pins, moisture, or contamination
  • Backprobe the Gate Select Position Circuit A at the sensor/actuator with key on; measure voltage versus reference and ground
  • Check continuity from the harness connector to the control module and check for shorts to battery (+) and ground
  • Perform wiggle test on harness while monitoring live data/voltage to reproduce fault

Signal parameters

  • Typical sensor/actuator circuit uses PCM/TCM direct drive or reference; expected low-voltage signal range: ~0–5 V for position sensors
  • High-voltage condition: measured voltage near battery voltage (approx. 12 V) or above expected sensor upper limit indicates short to power or internal short
  • Low/zero volts indicates open circuit or short to ground (not this code but useful for comparative testing)
  • Solenoid coils are driven by PWM/duty control on some systems — duty cycle 0–100% or pulse-width vary with commanded position (refer to service manual)
  • Resistance checks: solenoid/actuator coil resistance varies by design (typically low ohms). Consult OEM spec before replacing.

Diagnostic algorithm

  1. Connect a scan tool, confirm P0907 is active or stored, record freeze-frame/live data and related codes.
  2. Visually inspect the Gate Select Position A connector and wiring harness for damage, corrosion, or fluid ingress; repair obvious issues.
  3. With ignition ON (engine off), backprobe the signal wire at the connector. Measure voltage to ground. If voltage is high (near battery), suspect short to +12V or internal short in the component.
  4. Disconnect the sensor/solenoid plug and re-check the circuit at the harness connector: if the high voltage clears with sensor unplugged, suspect short or failed sensor; if it remains, suspect wiring or module.
  5. Check continuity from the harness connector to the transmission control module for opens; check for shorts to battery and ground (bench multimeter continuity and resistance tests).
  6. Repair any wiring damage or connector faults found. After repair, clear codes and re-test drive to confirm code does not return.
  7. If wiring and connector are good and the fault persists with a known-good component swap (if available), evaluate/replace the control module per manufacturer procedures.
  8. After repairs, perform operational verification: confirm correct gear selection, monitor live data for Gate Select Position A during key-on and driving conditions, and ensure no related codes return.
  9. Safety note: Disconnect battery before major wiring repairs. Follow manufacturer safety procedures when working near the transmission and electrical connectors.

Likely causes

  • Wiring short to +12V (most likely when code reads 'High')
  • Bad connector pin or corrosion at sensor/actuator connector
  • Failed position sensor or shift/selector solenoid
  • Poor ground or high resistance ground path
  • Module driver failure (least likely after wiring and component checks)

Fault status

⚠️ Status
Gate Select Position Circuit A voltage above allowable range detected by control module (circuit high).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0906 P0908 P0750 P0705 P0706
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