OBD Codes List

Diagnostic reference · P09A5

P09A5

Gate Select Position Circuit B High

System
Transmission (P code)
Lamp
Check Engine Light
Category
Powertrain - Transmission

What it means

P09A5 means Gate Select Position Circuit B High.

Check these first

  • A short to power in the gate select position sensor B circuit
  • An open in the sensor B ground
  • A sensor B that reads high or fixed
  • Corrosion at the sensor B connector
  • A control module fault

What to do next

  1. Read gate select position sensor B voltage on a scan tool
  2. Check the circuit for a short to power
  3. Test the sensor B ground
  4. Inspect the sensor B connector
  5. Replace the sensor if the reading is fixed high
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.