What Does P0A07 Mean?
The hybrid/EV powertrain control module has detected that the motor electronics coolant pump 'A' control circuit is reading high. This indicates the pump is not drawing current when commanded, typically due to an open in the pump ground circuit, a stuck relay, or the pump motor winding failing open under load. The power electronics cooling is compromised.
Safety Warning
Power electronics will not be cooled properly. The system will likely derate or shut down electric drive. Do not attempt sustained electric driving until repaired.
Common Causes
30%
Open ground circuit for coolant pump A preventing current flow
30%
Coolant pump A motor failing open under load (thermal winding failure)
25%
Pump relay stuck open or intermittent
15%
High resistance in pump power feed causing voltage drop
Diagnostic Steps
1
Step 1: Command the coolant pump on via bidirectional scan tool controls. Listen for pump operation and feel for coolant flow in the lines. No operation confirms the circuit high condition.
2
Step 2: Verify battery or HV voltage is reaching the pump connector when commanded on. If voltage is present but the pump does not run, the pump motor or ground is faulty.
3
Step 3: Measure pump motor resistance. If it reads OL when cold, the motor windings are open. If it reads in spec cold but the pump still fails, the motor may be opening under thermal load.
4
Step 4: Verify the pump ground circuit continuity back to the control module or chassis ground point. Clean and tighten ground connections.
5
Step 5: Test the pump relay by swapping with an identical relay or bench testing it. Check for voltage at the relay coil terminals when the pump is commanded on.
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 high. This indicates the pump is not drawing current when commanded, typically due to an open in the pump ground circuit, a stuck relay, or the pump motor winding failing open ...
The most common cause of P0A07 (Motor Electronics Coolant Pump "A" Control Circuit High) is: Open ground circuit for coolant pump A preventing current flow
Typical repair costs for P0A07 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Power electronics will not be cooled properly. The system will likely derate or shut down electric drive. Do not attempt sustained electric driving until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A07 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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