P280A

Transmission Range Sensor A Circuit Not Learned

Moderate severity

The TCM has not learned the calibration window for transmission range sensor A. Selector positions cannot be mapped reliably until adaptation completes.

Common causes

Adaptation lost after battery disconnect or TCM reset
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 P280A mean?

P280A means "Transmission Range Sensor A Circuit Not Learned". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.

What are the most common causes of P280A?

adaptation lost after battery disconnect or tcm reset; 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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