What Does P07BA Mean?
The transmission park position sensor/switch "B" circuit is reading higher voltage than expected. The TCM has detected that sensor B's signal voltage exceeds the normal operating range for the current gear position. This typically points to an open in the sensor circuit where the signal is pulled to reference voltage, a failed sensor with excessive resistance, or a short to a voltage source on the signal wire. Park detection redundancy is compromised by this fault.
Common Causes
35%
Open circuit in park position sensor B ground return or signal path
30%
Failed park position sensor B with high internal resistance or open element
15%
Short to battery voltage on sensor B signal wire from harness damage
15%
Corroded or loose sensor B connector causing high-resistance connection
5%
TCM reference voltage circuit problem affecting sensor B reading
Diagnostic Steps
1
Measure park position sensor B signal voltage at the TCM — reading near reference voltage (typically 5V) indicates an open sensor or return circuit.
2
Check sensor B ground/return circuit continuity from the sensor connector to the TCM connector.
3
Disconnect sensor B and measure resistance through all positions — high or infinite resistance confirms sensor failure.
4
Inspect the wiring harness for damaged insulation that could allow the signal wire to contact a voltage source.
5
Verify the sensor B connector is fully seated with proper terminal engagement and no corrosion.
Estimated Repair Cost
$120 - $550
Parts + labor, varies by vehicle and location
The transmission park position sensor/switch "B" circuit is reading higher voltage than expected. The TCM has detected that sensor B's signal voltage exceeds the normal operating range for the current gear position. This typically points to an open in the sensor circuit where the signal is pulled to...
The most common cause of P07BA (Transmission Park Position Sensor/Switch "B" Circuit High) is: Open circuit in park position sensor B ground return or signal path
Typical repair costs for P07BA range from $120 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Park position redundancy is reduced. The vehicle may still operate but relies solely on sensor A for Park verification. No-start conditions are possible depending on TCM programming. Always use the parking brake and schedule timely repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P07BA 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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