What Does P280B Mean?
The PCM has not successfully learned or stored the calibration data for transmission range sensor 'B'. This requires completion of the manufacturer's relearn procedure after sensor installation, battery service, or PCM replacement.
Common Causes
45%
Relearn procedure not performed after sensor replacement or battery service
25%
Transmission range sensor B misaligned or improperly installed
15%
Defective transmission range sensor B
10%
PCM not retaining learned values due to memory or power issue
5%
Sensor wiring or connector problem preventing proper signal during learning
Diagnostic Steps
1
Step 1: Confirm transmission range sensor B is correctly installed and properly aligned with transmission shaft
2
Step 2: Ensure battery voltage is above 12.5V and all connections are secure before attempting relearn
3
Step 3: Execute manufacturer-specific transmission range sensor B relearn procedure using factory scan tool or equivalent
4
Step 4: Verify sensor output voltage changes appropriately through all shift positions during relearn process
5
Step 5: If relearn fails, test sensor resistance, voltage output, and wiring continuity; replace components as needed
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 'B'. This requires completion of the manufacturer's relearn procedure after sensor installation, battery service, or PCM replacement.
The most common cause of P280B (Transmission Range Sensor "B" Circuit Not Learned) is: Relearn procedure not performed after sensor replacement or battery service
Typical repair costs for P280B range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May prevent vehicle from starting in Park, cause starting in wrong gear, or result in improper shift patterns. Backup lights may be inoperative.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P280B 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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