Motor Electronics Coolant Temperature High
The P0A06 code means the vehicle's onboard diagnostic system has detected: Motor Electronics Coolant Temperature High. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $200 - $800 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Hybrid system warning light
- Vehicle enters limp mode
- Possible automatic shutdown of hybrid system
Probable Causes (Ranked by Likelihood)
- Failed motor electronics coolant pump Very High
- Low coolant level in motor electronics circuit High
- Blocked radiator or cooling passages Moderate
- Failed coolant temperature sensor reading false high Low
Step-by-Step Diagnostic Procedure
-
Check motor electronics coolant level immediately.
-
Verify the coolant pump is running by listening for operation or checking current draw.
-
Inspect the motor electronics radiator for blockage or debris.
-
Compare coolant temperature sensor reading to an infrared thermometer reading on the coolant line.
Frequently Asked Questions
Is P0A06 an emergency?
Yes, P0A06 indicates the motor electronics are overheating. Stop driving as soon as safely possible. Continued operation can cause permanent damage to the inverter costing thousands to replace.
What cools the motor electronics in a hybrid?
Hybrid motor electronics have a dedicated cooling circuit with their own radiator, coolant pump, and coolant temperature sensor, separate from both the engine and hybrid battery cooling.
Can overheating damage the hybrid inverter?
Yes, excessive heat is the primary cause of inverter failure in hybrid vehicles. The inverter contains power transistors very sensitive to temperature. Damage can cost $2,000 to $5,000 or more.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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