Fault code P0C32 is called “Hybrid Battery Cooling System Performance” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.
Technical description and explained code P0C32
The P0C32 malfunction code is intended to be displayed exclusively on hybrid vehicles. Indicates that the Powertrain Control Module (PCM) has detected a fault with the hybrid battery cooling system.
The hybrid battery contains 3 temperature sensors that continuously measure the battery temperature with thermistors. The thermistor resistance tells the PCM the battery temperature.
If the battery temperature is lower the thermistor resistance will be high and if the temperature is high the resistance will be low. This resistance is measured by the PCM, which then determines the optimum airflow for the blower fan. To keep the battery functioning properly.
If the battery cooling system is faulty, the battery may overheat, causing various operating problems.
If the hybrid battery cooling system does not work properly, the control module will store the code P0C32. The malfunction indicator lamp (MIL) may then illuminate.
Symptoms of vehicle malfunctions
The main signal that an error P0C32 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.
It can also be warning signs such as:
- The “Check engine” control lamp on the control panel will illuminate (the code will be stored as a fault).
- Other high voltage battery related codes may be present.
- Elevated battery temperature.
- Reduced vehicle performance.
- Increased fuel consumption.
- Deactivation of the electric motor unit.
The severity of code P0C32 is high, as there is a risk of excessive temperature rise if the hybrid battery cooling system malfunctions. Which, in turn, may lead to an emergency engine shutdown.
Factors that can cause this error code
The error code P0C32 can mean that one or more of the following problems have occurred:
- The hybrid battery thermistor is defective.
- Faulty smart battery pack.
- Defective battery temperature sensor.
- Corrosion, loose or broken electrical wiring and connections.
- Defective cooling fan module.
- Vehicle’s 12-volt battery is not delivering desired voltage.
- Sometimes faulty PCM is the cause.
How to fix or reset OBD-2 code P0C32
Some suggested steps for troubleshooting and fix the error code P0C32:
- Connect an OBD-II scanner to the vehicle’s diagnostic connector and read all stored data and error codes.
- Clear the error codes from the computer memory and test-drive the vehicle to see if the P0C32 code appears again.
- If the error code appears again, visually inspect the electrical wires and connectors related to the hybrid battery cooling system.
- If necessary, repair or replace any shorted, broken, damaged, or corroded components.
- Check the battery thermistor and temperature sensor.
- Test the cooling fan.
- Test the battery and make sure the system voltage is normal.
- If the problem persists, check and replace the hybrid control module if necessary.
Diagnose and repair of problems
The first step in the P0C32 troubleshooting process is to review the Technical Service Bulletins (TSB). For known problems with a particular vehicle.
The advanced diagnostic steps are very vehicle specific. They may require, special equipment and knowledge to accurately perform the steps.
Visual inspection
Perform a visual inspection of the hybrid battery cooling system, check the thermistor and battery temperature sensor, as well as the electrical connection of the fan. Disconnect the connector and inspect for corrosion or bent contacts. If necessary, repair and apply dielectric grease to the terminals.
Open the fuse box and inspect the fuses related to the hybrid battery cooling system. The bottom of the fuse box cover usually indicates the location.
If these steps will not help you find the problem that caused error P0C32, there may be a bad connection to the PCM or the PCM itself is malfunctioning. If this is the case, it is better to consult a specialist for reprogramming or replacing the ECU.
On which vehicles does this problem occur most frequently
Fault code P0C32 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:
- Chevrolet (Malibu)
- GMC (Yukon)
Fault code P0C32 can sometimes be found with other errors. The most common are the following: P0A7A, P0A93, P0C31.
