Gear Shift Position Circuit High
Diagnostic trouble code P0917 indicates that the powertrain control module (PCM) or transmission control module (TCM) has detected a high voltage condition in the gear shift position sensor circuit. This means the voltage signal from the sensor exceeds the maximum expected threshold, suggesting a short to voltage or a faulty sensor.
While the vehicle may still be drivable, a faulty gear shift position circuit can lead to erratic shifting, limp mode, or the inability to start the vehicle if the computer cannot verify it is in Park or Neutral. It should be diagnosed and repaired soon to prevent drivability issues.
Common symptoms
- Illuminated Check Engine Light
- Harsh or erratic transmission shifting
- Transmission stuck in limp mode (limited gears)
- Inability to start the engine (if Park/Neutral is not recognized)
- Incorrect gear indicator display on the dashboard
Likely causes
- Faulty gear shift position sensor (transmission range sensor)
- Short to voltage in the gear shift position sensor wiring harness
- Corroded, damaged, or loose electrical connector at the sensor
- Misadjusted gear shift linkage or sensor
- Internal transmission mechanical failure affecting the shift shaft
- Faulty PCM or TCM (rare)
What to check before replacing parts
Scan for additional codes and record freeze frame data.
Look for: Check if other transmission or sensor codes are present, which might indicate a shared circuit issue or a broader electrical problem.
Visually inspect the gear shift position sensor, wiring, and connectors.
Look for: Look for frayed wires, melted insulation, corrosion in the connector pins, or physical damage to the sensor housing that could cause a short to voltage.
Check the adjustment of the gear shift linkage and sensor.
Look for: Ensure the mechanical linkage moves smoothly and the sensor is properly aligned according to the manufacturer's specifications.
Test the gear shift position sensor circuit for a short to voltage.
Look for: Using a multimeter, check the signal wire for voltage that matches battery voltage or a 5V reference when it should be lower, indicating a short to power.
Test the gear shift position sensor resistance or voltage output through its range.
Look for: Verify that the sensor's output changes smoothly and stays within the manufacturer's specified voltage or resistance range as the gear selector is moved through all positions.
This page explains the generic P0917 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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