P0A06 Fault Code

Motor Electronics Coolant Pump "A" Control Circuit Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0A06 fault code indicates an issue with the Motor Electronics Coolant Pump 'A' Control Circuit. This code typically arises when the engine control module (ECM) detects that the voltage in the coolant pump circuit is lower than expected, which can affect the cooling efficiency of the motor electronics. Adequate cooling is crucial for the operation of hybrid and electric vehicles, making this a significant fault that requires attention.

What are the symptoms of the P0A06 code?

Drivers may experience several symptoms when the P0A06 code is triggered:

• Warning lights on the dashboard, typically the check engine light.
• Overheating of the electric motor or inverter system.
• Reduced performance or efficiency from the hybrid or electric system.
• Audible noise from the coolant pump, possibly indicating a malfunction.
• Increased engine temperature readings.

What causes the P0A06 code?

Several factors can lead to a low control circuit voltage for the coolant pump:

• Faulty coolant pump.
• Damaged or corroded wiring in the control circuit.
• Poor electrical connections at the pump or ECM.
• Failed relay controlling the coolant pump.
• A blown fuse in the pump circuit.

How to fix P0A06?

Addressing the P0A06 fault code involves several diagnostic and repair actions:

1. Begin by checking all relevant fuses and replacing any that are blown.
2. Inspect the wiring for any signs of damage, corrosion, or loose connections.
3. Test the coolant pump for functionality and replace it if it is faulty.
4. Ensure relays controlling the pump are operational and replace them if necessary.
5. Clear the fault codes and monitor the system to ensure the issue is resolved.