P0C18

Drive Motor B Position Sensor Not Learned

Moderate severity

The hybrid control module has not learned the rotor position offset for drive motor B. Phase commutation cannot be optimised until learning completes.

Common causes

Adaptation lost after battery disconnect
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $60-280
Sensor replaced without learn procedure
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $60-280
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does P0C18 mean?

P0C18 means "Drive Motor B Position Sensor Not Learned". It is a generic OBD-II code that points to a fault in the hybrid / ev powertrain.

What are the most common causes of P0C18?

adaptation lost after battery disconnect; sensor replaced without learn procedure — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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