What Does P280A Mean?
The PCM has not successfully learned or stored the calibration data for transmission range sensor 'A'. This typically occurs after sensor replacement, battery disconnect, or PCM replacement without performing the required relearn procedure.
Common Causes
45%
Relearn procedure not performed after sensor replacement or battery disconnect
25%
Sensor misaligned preventing successful calibration
15%
Faulty transmission range sensor A preventing learning
10%
PCM memory corruption or software issue
5%
Wiring or connector issue interfering with sensor signal during relearn
Diagnostic Steps
1
Step 1: Verify transmission range sensor A is properly installed and aligned per manufacturer specifications
2
Step 2: Perform manufacturer-specific transmission range sensor relearn/calibration procedure using appropriate scan tool
3
Step 3: Ensure vehicle battery is fully charged and connections are clean before attempting relearn
4
Step 4: Monitor live data during relearn to verify sensor provides proper voltage changes through all gear positions
5
Step 5: If relearn fails repeatedly, test sensor operation and wiring integrity; replace sensor if faulty
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The PCM has not successfully learned or stored the calibration data for transmission range sensor 'A'. This typically occurs after sensor replacement, battery disconnect, or PCM replacement without performing the required relearn procedure.
The most common cause of P280A (Transmission Range Sensor "A" Circuit Not Learned) is: Relearn procedure not performed after sensor replacement or battery disconnect
Typical repair costs for P280A range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not start, may start in wrong gear, or transmission may not shift properly. Backup lights and cruise control may not function.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P280A to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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