P0908
UniversalP0908 indicates an intermittent electrical fault within the circuit that monitors the position of the gate select lever in the transmission. This circuit provides input to the Powertrain Control Module (PCM) or Transmission Control Module (TCM) regarding the driver's gear selection.
Medium SeverityThis code signifies an intermittent electrical problem in the circuit responsible for communicating your chosen gear (like Park, Reverse, or Drive) to the car's computer. This can lead to difficulties in gear engagement or prevent the vehicle from starting if the computer inaccurately registers the gate select position.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is securely in Park or Neutral with the parking brake engaged before performing any diagnostics or repairs. Disconnect the battery before working on electrical components to prevent accidental short circuits or injury.
Common Symptoms
- Check Engine Light illuminated
- Difficulty shifting gears
- Vehicle not starting in Park or Neutral
- Transmission may enter 'limp mode'
- Incorrect gear display on the dashboard
Common Causes
- Faulty gate select position sensor/switch
- Corroded or loose electrical connectors in the gate select circuit
- Damaged or frayed wiring in the gate select circuit
- Internal transmission control module (TCM) or powertrain control module (PCM) fault (less common)
- Shifter mechanism issues affecting sensor input
Frequently reported on: General/Universal
Diagnostic Steps
- Research the specific location of the gate select position sensor/switch for your vehicle model.
- Visually inspect the wiring and connectors related to the gate select sensor for any signs of corrosion, damage, or looseness.
- Clean any corroded connectors with electrical contact cleaner and ensure they are securely reconnected.
- If accessible, check the sensor's operation with a multimeter, referring to your vehicle's service manual for expected resistance values.
- Clear the code and test drive the vehicle to see if the issue reappears.
👨🔧 When to Call a Professional
If you experience difficulty shifting gears, the vehicle refuses to start in Park or Neutral, or the Check Engine Light illuminates intermittently, it's best to consult a professional mechanic. Intermittent electrical issues can be challenging to pinpoint without specialized diagnostic equipment.
Commonly Asked Questions
What does "intermittent" mean in P0908?
Intermittent means the fault is not constant; it appears and disappears, making it harder to diagnose as the problem may not be present during testing.
Can I drive with an intermittent P0908 code?
It is generally not recommended to drive for extended periods with this code. An intermittent fault could escalate into a permanent one, potentially leading to unexpected shifting issues or preventing your car from starting.
Is the gate select position sensor the same as the neutral safety switch?
In many vehicles, the gate select position sensor (or PRNDL switch) integrates the function of the neutral safety switch, which prevents the engine from starting unless the transmission is securely in Park or Neutral.
What tools do I typically need to diagnose P0908?
A basic OBD-II scanner to read and clear codes, a multimeter for electrical checks, and potentially a vehicle-specific service manual for wiring diagrams and sensor specifications are usually helpful.
Could a low battery cause P0908?
While less common, a severely weak or dying battery can sometimes cause various intermittent electrical issues, including triggering false or erratic diagnostic trouble codes, by providing unstable voltage to control modules.