P0A0C critical

Drive Motor A Position Sensor Circuit

The P0A0C code means the vehicle's onboard diagnostic system has detected: Drive Motor A Position Sensor Circuit. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $400 - $1,200 (parts and labor)

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Common Symptoms

Check Engine Light on
Hybrid system disabled
Vehicle may not move under electric power
Harsh shifting between electric and gas operation

Probable Causes (Ranked by Likelihood)

Failed motor position sensor (resolver) Very High
Damaged sensor wiring harness High
Corroded connector at motor position sensor Moderate
Failed hybrid control module sensor input Low

Step-by-Step Diagnostic Procedure

Read motor position sensor data with a scan tool while slowly rotating the drive motor.
Inspect the motor position sensor connector and wiring for damage.
Measure sensor output signal characteristics and compare to specification.
Check for proper sensor air gap if applicable.

Frequently Asked Questions

What is a motor position sensor in a hybrid?

The motor position sensor, often called a resolver, tells the hybrid control module the exact rotational position and speed of the electric drive motor. This is critical for precise motor control.

Can I drive without the motor position sensor working?

The vehicle may operate in a limited mode using only the gasoline engine, but the hybrid system will be disabled. Some vehicles may not move at all.

Is the motor position sensor inside the transmission?

In most hybrids, the motor position sensor is mounted on or near the electric motor within the transaxle assembly. Access typically requires significant disassembly.