Gate Select Position Circuit Range/Performance
The P0905 code indicates that the transmission control module (TCM) has detected a malfunction in the gate select position sensor circuit, which monitors the position of the gear selector (e.g., Park, Reverse, Neutral, Drive). The sensor's output signal is outside the expected range or performance parameters, often due to a faulty sensor, wiring issues, or a misadjusted shift linkage. This can cause incorrect gear selection or prevent the vehicle from starting.
01. Most Common Causes
- Faulty gate select position sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Misadjusted or worn shift linkage
- Faulty transmission control module (TCM)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in one gear or fails to shift
- Engine starts only in Park or Neutral intermittently
- Erratic or no gear position display on dashboard
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the gate select position sensor and wiring for damage or corrosion.
Step 3: Test sensor voltage and resistance with a multimeter against manufacturer specs.
Step 4: Check shift linkage adjustment and operation.
Step 5: If all else is normal, test TCM output signals or replace TCM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The transmission may not shift correctly, potentially causing unsafe driving conditions or leaving you stranded.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the part (sensor or linkage) and labor rates.