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DTC codes / P0Cxx · Hybrid propulsion / P0C6C

P0C6CGenerator Position Sensor Circuit B Circuit High

P0C6C indicates that the generator position sensor circuit B is reporting a voltage higher than the manufacturer's expected range. The engine control module (ECM) or hybrid control module monitors this sensor to determine the rotational position of the generator, and it sets the code when the signal voltage stays above the normal threshold for a calibrated time.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon light.
  • Often no symptoms besides the warning light, especially if the generator continues to charge normally.
  • Intermittent charging system warning light or battery symbol on the dash.
  • Reduced or fluctuating charging voltage noticed on a volt gauge or through accessory performance.
  • Possible engine hesitation or stall if the generator position signal is used for load management.
  • In hybrid vehicles, a transition to reduced power mode or limited generator operation.

Common causes, most likely first

  1. Damaged or chafed wiring in the generator position sensor B circuit, causing a short to voltage.
  2. Corroded, loose, or water-intruded connector at the generator position sensor or the control module.
  3. Failed generator position sensor B, internally shorted and pulling the signal high.
  4. Faulty engine control module or hybrid control module driver for the sensor circuit.
  5. Metal debris or contamination on the sensor tip or reluctor wheel, altering the signal.
  6. Aftermarket accessory installation that tapped into the sensor wiring and introduced a voltage fault.

How to diagnose and fix it

  1. Connect a scan tool and record the freeze-frame data and any stored or pending codes to confirm the fault condition.
  2. Visually inspect the generator position sensor, its connector, and the wiring harness for damage, corrosion, or loose pins.
  3. Measure the sensor reference voltage and signal voltage at the sensor connector with a digital multimeter and compare to the manufacturer's specification.
  4. Disconnect the sensor and check for a short to voltage on the signal circuit by measuring voltage with the key on and the sensor unplugged.
  5. Perform a wiggle test on the harness while monitoring the sensor signal on a scan tool to reveal intermittent wiring faults.
  6. If the circuit tests good, substitute a known-good sensor and clear the code to see if it returns.
  7. If the code persists after sensor replacement, diagnose the control module and its programming or replacement as the final step.

Generator Position Sensor B Circuit High Pitfalls

  • A short to voltage on the signal wire is often caused by a harness rubbing against a sharp bracket or heat shield, not by the sensor itself.
  • The generator position sensor B circuit may share a reference voltage with other sensors, so a fault elsewhere can pull the entire reference line high and set this code.
  • On some vehicles, a weak or failing battery can cause erratic sensor signals and set this code without any sensor or wiring fault.
  • Clearing the code and immediately test-driving may not be enough; the fault may only reappear after a specific number of drive cycles or under certain temperature conditions.
  • Aftermarket electrical accessories wired into the charging system can back-feed voltage onto the sensor circuit and trigger this code intermittently.

Can I keep driving with P0C6C?

You can usually drive the vehicle with this code if the charging system is still working and the battery warning light is not on, but avoid long trips or heavy electrical loads until it is diagnosed. If the charging voltage drops or the engine runs poorly, stop driving and have the vehicle inspected promptly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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