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DTC codes / P2Cxx · Hybrid propulsion / P2CC6

P2CC6Generator Inverter Power Supply B Circuit Low

P2CC6 indicates that the generator inverter power supply B circuit has a low voltage condition, meaning the control module has detected a voltage below the expected threshold on that specific circuit. The inverter converts DC power from the battery to the high-voltage AC needed by the motor-generator, and a low supply voltage can prevent proper inverter operation.

SystemPowertrain
Code typeGeneric (all makes)
SeverityHigh
Fix difficultyProfessional
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the hybrid system warning light or check engine light
  • Reduced engine power or limp mode
  • The vehicle may fail to start or enter ready mode
  • No noticeable symptoms besides the warning light in some cases
  • Intermittent loss of charging or accessory power

Common causes, most likely first

  1. Corroded, loose, or damaged wiring or connectors in the inverter power supply B circuit
  2. Blown fuse or fusible link protecting the inverter power supply B circuit
  3. Faulty inverter assembly internal short or open circuit
  4. Failed voltage supply module or power control unit
  5. High resistance in a ground connection for the inverter
  6. Low auxiliary battery voltage or poor battery connections

How to diagnose and fix it

  1. Verify battery voltage and state of charge; recharge or replace the auxiliary battery if low
  2. Inspect and test the fuse and fusible link for the inverter power supply B circuit
  3. Perform a visual inspection of wiring and connectors for corrosion, chafing, or looseness
  4. Measure voltage drop across the power supply B circuit under load to identify high resistance
  5. Check ground connections for the inverter and power control unit for cleanliness and tightness
  6. If wiring and fuses are good, test the inverter assembly according to manufacturer procedures
  7. Replace the faulty inverter or power control module as needed and clear the code

Don't overlook the auxiliary battery

  • A weak or failing auxiliary battery is a common cause of this code because the inverter relies on a stable 12-volt supply to operate correctly.
  • Corroded ground connections can mimic a faulty inverter, so always check grounds before condemning expensive components.
  • The code can set intermittently due to a loose connector that only loses contact during vibration or temperature changes.
  • Some vehicles may store this code without any drivability symptoms, leading to misdiagnosis as a non-issue.
  • Always consult the factory service information for the specific voltage thresholds and circuit testing procedures for your vehicle.

Can I keep driving with P2CC6?

Do not continue driving with this code active, as a low inverter supply voltage can cause a sudden loss of power or prevent the vehicle from starting. Have the vehicle inspected by a qualified technician as soon as possible.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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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