What Does P07BB Mean?
The transmission park position sensor/switch "B" circuit performance is low, meaning the sensor signal falls within the valid voltage range but reads lower than expected for the actual gear position. The TCM has detected a rationality fault where sensor B output does not match the anticipated value, trending toward the low end. This suggests sensor degradation, mechanical misalignment, high-resistance wiring, or shift linkage issues affecting the sensor's reading accuracy.
Common Causes
30%
Park position sensor B mechanically misaligned on the transmission
30%
Worn or contaminated sensor B element producing inaccurate low-range readings
20%
High-resistance connection in sensor B circuit causing signal voltage drop
15%
Manual valve or park mechanism wear affecting sensor positioning
5%
Partial ground fault on sensor B signal wire
Diagnostic Steps
1
Monitor park position sensor B voltage in real-time through all gear positions and compare to manufacturer voltage specification chart.
2
Verify sensor B alignment and mounting — check that it is properly indexed to the manual valve shaft.
3
Check shift cable adjustment to ensure the manual valve fully seats in each detent position.
4
Measure sensor B circuit resistance and check for high-resistance connections causing voltage drop.
5
If alignment and wiring are correct, replace sensor B — internal element wear causes gradual performance degradation.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The transmission park position sensor/switch "B" circuit performance is low, meaning the sensor signal falls within the valid voltage range but reads lower than expected for the actual gear position. The TCM has detected a rationality fault where sensor B output does not match the anticipated value,...
The most common cause of P07BB (Transmission Park Position Sensor/Switch "B" Circuit Performance/Low) is: Park position sensor B mechanically misaligned on the transmission
Typical repair costs for P07BB range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle should still be drivable but Park position detection via sensor B is unreliable. The TCM may fall back to sensor A only. Always engage the parking brake. Have the issue diagnosed and corrected in a timely manner.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P07BB 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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