P0A24 critical

Motor/Generator B Over Temperature

The P0A24 code means the vehicle's onboard diagnostic system has detected: Motor/Generator B Over Temperature. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $500 - $5,000 (parts and labor)

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Common Symptoms

Check Engine Light on
Hybrid system shutdown
Strong reduction in electric motor power
Burning smell from transaxle area in severe cases

Probable Causes (Ranked by Likelihood)

Motor/generator cooling system failure Very High
Sustained heavy load exceeding motor thermal capacity High
Low transaxle fluid level Moderate
Motor bearing failure generating excess friction heat Low

Step-by-Step Diagnostic Procedure

Check transaxle fluid level and condition.
Verify motor/generator cooling system operation.
Review driving history for sustained heavy load conditions.
After cooling, monitor motor temperature during a test drive.

Frequently Asked Questions

Can towing cause motor/generator overheating?

Yes, towing heavy loads creates sustained high torque demand. Most hybrid vehicles are not rated for heavy towing.

How do I prevent motor/generator overheating?

Avoid sustained heavy loads, ensure cooling system maintenance, maintain proper transaxle fluid level, and do not exceed the vehicle towing capacity.

What temperature causes motor/generator damage?

Motor winding insulation typically breaks down above 180 to 200 degrees Celsius. The control module will derate and eventually shut down the motor before reaching these levels.