OBD Codes List

Diagnostic reference · P0C6B

P0C6B

Generator Position Sensor Circuit B Low

System
Powertrain control (P code)
Lamp
Check Engine Light
Category
Powertrain - Fuel/Air Metering

What it means

P0C6B means Generator Position Sensor Circuit B Low.

Where it lives

For P0C6B, the sensor sits on the circuit this code reports. The description of P0C6B reports a fault at the sensor.

Check these first

  • A short to ground in the generator position sensor B circuit
  • A weak generator position sensor B output
  • Corrosion at the sensor B connector
  • A low reference voltage feeding sensor B
  • Worn brushes or a bearing disturbing the sensor B signal

What to do next

  1. Read generator position sensor B voltage on a scan tool
  2. Inspect the sensor B connector and wiring
  3. Test the sensor B circuit for a short to ground
  4. Measure the sensor B output against the reference
  5. Replace the sensor if the output stays low
  6. Clear the code and retest

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Updated

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