What Does P2800 Mean?
The PCM has detected a fault in the Transmission Range Sensor 'B' circuit, which monitors the position selector (PRNDL). This secondary range sensor circuit is reporting abnormal voltage or signal pattern that doesn't match expected gear selector position.
Common Causes
35%
Faulty transmission range sensor/switch (TR sensor B) internal failure
25%
Damaged or corroded transmission range sensor connector or wiring
20%
Misadjusted or improperly installed transmission range sensor
12%
Internal transmission shift linkage or manual valve position issue
8%
TCM/PCM internal circuit fault or software issue
Diagnostic Steps
1
Step 1: Inspect transmission range sensor connector for corrosion, bent pins, or moisture; clean and repair as needed
2
Step 2: Using scan tool live data, monitor TR sensor B voltage/position readings while slowly moving shifter through all gear positions
3
Step 3: Verify proper reference voltage (typically 5V or 12V depending on design) at TR sensor connector with ignition on
4
Step 4: Check TR sensor adjustment/alignment per manufacturer specifications; adjust if necessary
5
Step 5: If readings are erratic or out of range, test sensor resistance values per service manual; replace sensor if values are incorrect
Estimated Repair Cost
$200 - $550
Parts + labor, varies by vehicle and location
The PCM has detected a fault in the Transmission Range Sensor 'B' circuit, which monitors the position selector (PRNDL). This secondary range sensor circuit is reporting abnormal voltage or signal pattern that doesn't match expected gear selector position.
The most common cause of P2800 (Transmission Range Sensor "B" Circuit (PRNDL Input)) is: Faulty transmission range sensor/switch (TR sensor B) internal failure
Typical repair costs for P2800 range from $200 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not start in Park, may start in gear creating rollaway hazard, or may experience unintended shifts. Backup lights and cruise control may not function properly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2800 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
