P0CC5

What it means

P0CC5 means the control unit monitoring the 14 volt power module (the converter that supplies the low-voltage system in a hybrid or electric vehicle) found that its two current sensors, A and B, do not agree within the expected tolerance. The control unit compares the two readings and sets the code when the difference is too large for too long. It does not say which sensor is wrong, and the layout varies by model.

Symptoms

• Warning lights on the dash, such as a hybrid or EV system fault light or the general warning light
• Low 12 volt battery warning, or a battery charge warning
• Reduced power or limp mode on some models
• Flickering lights, a weak-sounding horn or unstable electrical accessories
• Vehicle slow to ready up, or will not go to ready
• Other power module or DC-DC converter codes stored alongside

Possible causes

• Faulty current sensor A or B inside the 14 volt power module (DC-DC converter)likely
• Wiring or connector fault in the power module's sensor or signal circuits, such as corrosion, loose pins or chafinglikely
• Weak or failing 12 volt battery or poor battery connections causing unstable readings and current swingspossible
• Internal fault in the power module's control circuitry causing incorrect current readingspossible
• Overheating of the power module from a cooling or airflow problem affecting sensor accuracypossible
• Outdated control unit software where a manufacturer bulletin lists it as a known causerare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting battery voltage, load and temperature when the code set
2. Test the 12 volt battery condition and charging voltage, and check the battery terminals and earth connections for tightness and corrosion
3. Visually inspect the power module's wiring, connectors and mounting for damage, water ingress, corrosion or heat marks (high voltage parts must only be handled by a suitably trained technician following isolation procedures)
4. Check the cooling system or airflow to the power module is working, if the model has one
5. Compare the live data of current sensors A and B with minimal load and again with loads switched on; note which reading looks implausible
6. Check the supply, signal and earth circuits to the module with a multimeter against the manufacturer's wiring diagram
7. Look up manufacturer technical bulletins and software updates for this code and model
8. Clear the code and road test to see if it returns, and recheck the live data

How to fix

• Repair or replace damaged wiring, and clean or replace corroded or loose connectors
• Replace a weak 12 volt battery and fix poor terminal or earth connections
• Replace the 14 volt power module (DC-DC converter) if a sensor or internal fault is confirmed, following the manufacturer's procedure
• Restore proper cooling or airflow to the power module if overheating is found
• Apply a manufacturer software update only if a bulletin identifies outdated software as the cause

Can I keep driving?

Nearby codes

• P0CC4GenericDrive Motor A Coolant Pump Control Circuit High
• P0CC6GenericCharge Port Door A Open Request Switch Wake-Up Circuit