Motor Electronics Coolant Pump Performance Failure
The auxiliary electric coolant pump cooling the drive motors and power inverter is spinning at an incorrect speed or drawing improper current. This leaves electronics prone to overheating under heavy loads, triggering immediate power derating (limp mode).
Estimated Cost
$425
Repair Time
1-2 hours
Difficulty
Shop Recommended
Can I Fix This Myself?
Professional Service Recommended
This repair involves high-voltage components or specialized equipment.
What professionals will use:
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Step-by-Step Fix Instructions
- 1
Check motor electronics cooling reservoir fluid level at the max fill line.
- 2
Inspect radiator and hoses for impact punctures or fluid leaks.
- 3
Replace any blown fuses assigned to the coolant pump circuit.
- 4
Run a scan tool Coolant Loop Air Purge to remove trapped air causing cavitation.
- 5
Check for solid 12V supply at the pump housing electrical plug.
- 6
Drain cooling fluid, unbolt harness, and install a new auxiliary electric coolant pump.
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Step-by-Step Diagnostic Wizard
Answer each question to narrow down the root cause of your P0C73 fault.
Check for Physical Damage
Step 1 of ~5
Inspect the undercarriage near the front left motor (Motor A). Look for impact damage, bent wiring harness, or signs the vehicle has been off-road with significant rock strikes.
Is there visible physical damage or wiring harness disturbance near the front motor?
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