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DTC codes / P2Cxx · Hybrid propulsion / P2CC7

P2CC7Generator Inverter Power Supply B Circuit High

P2CC7 indicates that the generator inverter power supply B circuit has been detected by the control module as operating above its expected voltage range. The inverter converts DC power from the high-voltage battery into AC power for the generator, and a high voltage on this supply circuit points to a wiring, connector, or internal inverter fault rather than a charging system failure.

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

Symptoms you may notice

  • Illumination of the hybrid system warning light or check engine light, often with no other noticeable symptoms
  • Reduced or disabled generator function, leading to a loss of high-voltage charging capability
  • The vehicle may enter a fail-safe mode with reduced power or limited electric-only operation
  • Possible inability to start the engine or engage drive if the inverter is disabled
  • In some cases, a message on the dash indicating a hybrid system fault or service required

Common causes, most likely first

  1. A short to voltage or high resistance in the power supply B circuit wiring, including chafed or damaged harnesses
  2. Corroded, loose, or damaged connector pins at the inverter or generator connections
  3. Internal failure of the generator inverter assembly, such as a faulty voltage regulator or power module
  4. A failed or degraded 12-volt auxiliary battery causing unstable reference voltage to the inverter control circuit
  5. Water intrusion or contamination in the inverter housing or connectors, leading to abnormal voltage feedback
  6. A fault in the control module that monitors the circuit, though this is less common

How to diagnose and fix it

  1. Perform a visual inspection of the inverter and generator wiring harnesses for damage, chafing, or corrosion, and check connector pins for tightness and cleanliness
  2. Measure the 12-volt battery voltage and charging system output to rule out a weak battery or charging issue affecting the inverter control circuit
  3. Use a scan tool to retrieve all stored codes and freeze-frame data, then clear codes and test-drive to see if P2CC7 returns
  4. Backprobe the power supply B circuit at the inverter connector and measure voltage with the key on and engine running, comparing to manufacturer specifications
  5. Check for continuity and resistance in the power supply B circuit between the inverter and the control module, looking for opens or shorts
  6. If wiring and connectors are good, perform a voltage drop test on the circuit under load to identify high resistance
  7. If the circuit tests normal, follow the manufacturer's diagnostic flow for inverter internal fault confirmation, which may require replacement of the inverter assembly

What the inverter circuit test reveals

  • A high voltage on the power supply B circuit often results from a poor ground connection at the inverter, which can cause the circuit to float high rather than a direct short.
  • Technicians sometimes replace the inverter only to find the root cause was a chafed wire in the harness near the generator, so always inspect the entire circuit before condemning the inverter.
  • The code can be set by a weak 12-volt battery that causes the control module to misread the supply voltage, so always load-test the battery first.
  • In some vehicles, this code may be stored as history after a low-voltage event such as a jump start, and it may not indicate a current fault if it does not return after clearing.
  • The power supply B circuit is often shared with other sensors or modules, so a fault in a related system can set this code without any issue in the inverter itself.

Can I keep driving with P2CC7?

If the vehicle drives normally with only the warning light on, you can drive short distances to a repair shop, but avoid heavy acceleration or long trips. If the vehicle enters fail-safe mode or loses power, stop driving and have it towed to prevent further damage.

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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