What Does P07BC Mean?
The transmission park position sensor/switch "B" circuit performance is high, meaning the sensor signal is within valid range but reading higher than expected for the actual gear position. The TCM has detected that sensor B output is offset toward the high end of its expected range, not matching the anticipated voltage for the current transmission position. This is a performance/rationality fault indicating sensor degradation, misalignment, or a wiring issue affecting signal accuracy.
Common Causes
30%
Park position sensor B misalignment or improper installation producing offset readings
30%
Degraded sensor B element producing inaccurate high-range voltage output
20%
Partial open or high-resistance ground return elevating sensor B signal voltage
15%
Shift cable maladjustment causing manual valve not to fully seat in detent positions
5%
Partial short to voltage on sensor B signal wire
Diagnostic Steps
1
Monitor park position sensor B voltage in real-time through all positions and compare to factory voltage specification chart.
2
Verify sensor B alignment and mounting on the transmission relative to the manual valve shaft.
3
Inspect and adjust the shift cable to ensure the manual valve fully engages each detent position.
4
Check sensor B ground circuit for high resistance — measure voltage drop across the ground path with sensor energized.
5
If mechanical alignment and wiring confirm correct, replace park position sensor B due to internal element drift.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The transmission park position sensor/switch "B" circuit performance is high, meaning the sensor signal is within valid range but reading higher than expected for the actual gear position. The TCM has detected that sensor B output is offset toward the high end of its expected range, not matching the...
The most common cause of P07BC (Transmission Park Position Sensor/Switch "B" Circuit Performance High) is: Park position sensor B misalignment or improper installation producing offset readings
Typical repair costs for P07BC range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is likely drivable but sensor B provides inaccurate Park position data. The TCM may rely solely on sensor A. Gear display may occasionally be incorrect. Always use the parking brake and schedule repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P07BC to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control / Park System
Difficulty
Type
Generic (SAE)
Recommended Tools
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