What Does P0A06 Mean?
The hybrid/EV powertrain control module has detected that the motor electronics coolant pump 'A' control circuit is reading low. This indicates the pump circuit has a short to ground, the pump motor is shorted internally, or the control signal is being grounded. The pump may be running at full speed uncontrolled or may not be responding to commands properly.
Safety Warning
A shorted pump circuit could blow fuses, disable cooling entirely, or cause uncontrolled pump operation. Risk of power electronics overheating. Do not operate under electric power.
Common Causes
35%
Coolant pump A motor internally shorted to ground
30%
Pump control wire shorted to ground from harness damage
20%
Water or coolant intrusion into the pump connector causing a short
15%
Control module pump driver shorted internally
Diagnostic Steps
1
Step 1: Disconnect the pump connector and check for coolant or moisture contamination. Coolant pump connectors are prone to leaks that cause shorts. Dry thoroughly and inspect pins.
2
Step 2: Measure pump motor resistance with the connector unplugged. Very low resistance (near 0 ohms) or continuity to the pump housing indicates an internal motor short.
3
Step 3: On the harness side, check for continuity between the pump control wire and ground. No continuity should exist. If present, trace and repair the harness short.
4
Step 4: Monitor the pump control circuit voltage at the control module connector with the pump disconnected. Verify the driver can output proper voltage without the load.
5
Step 5: If all external tests pass, reconnect and command the pump on/off via bidirectional controls while monitoring current draw. Excessive current confirms an internal pump fault.
Estimated Repair Cost
$300 - $1,200
Parts + labor, varies by vehicle and location
The hybrid/EV powertrain control module has detected that the motor electronics coolant pump 'A' control circuit is reading low. This indicates the pump circuit has a short to ground, the pump motor is shorted internally, or the control signal is being grounded. The pump may be running at full speed...
The most common cause of P0A06 (Motor Electronics Coolant Pump "A" Control Circuit Low) is: Coolant pump A motor internally shorted to ground
Typical repair costs for P0A06 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A shorted pump circuit could blow fuses, disable cooling entirely, or cause uncontrolled pump operation. Risk of power electronics overheating. Do not operate under electric power.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A06 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Motor Electronics Cooling
Difficulty
Type
Generic (SAE)
Recommended Tools
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