Gear Shift Position Sensor Circuit Low
The gear shift position sensor signal is below the normal operating range.
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What it means (plain English)
Inside the transmission, there's a sensor that tells the computer what gear the vehicle is in. If it reads too low or fails, the computer gets confused and can’t tell what gear to use.
What the computer is actually seeing
The engine control module (ECM) expects a signal voltage around 0.5 to 4.5 volts corresponding to the gear position. If it sees a voltage below 0.5 volts, it triggers this fault code.
What a healthy reading looks like
Expected signal voltage range: 0.5V (in gear) to 4.5V (in neutral/park).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the gear shift position sensor wiring for any visible damage or loose connections. If found, repair or reconnect as necessary.
- 22. Ensure the transmission fluid is at the correct level. Check level with the vehicle on a level surface, and top up if low. If low, investigate for leaks.
- 33. Using a multimeter, check the voltage at the gear shift position sensor connector. Expect to see between 0.5V and 4.5V when shifting through gears. If not, replace the sensor.
- 44. If the sensor voltage is correct but the code persists, check the connector for corrosion or damage. Repair/replace as needed.
- 55. If the sensor and wiring are good, consider testing the transmission control module for faults.
Common causes
- Faulty gear shift position sensor
- Damaged wiring or connectors to the sensor
- Faulty transmission control module (TCM)
- Low transmission fluid levels
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally driveable, but watch for any shifting issues and fix it soon to avoid potential damage to the transmission.
Will the fault come back after I fix it?
If the sensor and wiring are correctly repaired or replaced, the code shouldn't come back.
Why does this code sometimes pair with SPN 2135?
SPN 2135 relates to the transmission control module; if the gear shift sensor fails, it may affect module operation, triggering multiple codes.
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