OBD Codes List

Diagnostic reference · P09A8

P09A8

Gate Select Position Circuit C Low

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

What it means

P09A8 means Gate Select Position Circuit C Low.

Check these first

  • A short to ground in the gate select position sensor C circuit
  • A sensor C that reads low or fixed
  • A worn sensing element inside sensor C
  • Corrosion at the sensor C connector

What to do next

  1. Read gate select position sensor C voltage on a scan tool
  2. Check the circuit for a short to ground
  3. Inspect the sensor C connector
  4. Compare sensor C output through the gate range
  5. Replace the sensor if the low reading persists
  6. Clear the code and retest

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Updated

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