What Does P07B2 Mean?
The transmission park position sensor/switch "A" circuit has an open condition. This sensor tells the TCM and other modules whether the transmission is in Park. An open circuit means the signal wire is broken, disconnected, or has a poor connection, preventing the TCM from reliably determining if the transmission is in the Park position. This can affect starter engagement, shift interlock operation, and backup camera activation.
Common Causes
35%
Damaged or disconnected wiring harness between park position sensor A and TCM
30%
Failed park position sensor/switch A with internal open circuit
20%
Corroded or backed-out connector pins at the sensor or TCM connector
10%
Damaged TCM internal circuitry on the sensor A input driver
5%
Chafed or broken wire from transmission movement causing intermittent open
Diagnostic Steps
1
Inspect the park position sensor A connector at the transmission for damage, corrosion, backed-out pins, or disconnection.
2
Measure sensor A signal circuit continuity from the sensor connector back to the TCM connector using a multimeter.
3
Check sensor A supply voltage and ground circuits at the sensor connector with the key on to verify the TCM is providing proper power.
4
Test the park position sensor itself by measuring resistance or voltage output while manually cycling through gear positions.
5
If wiring and sensor test good, check for TCM connector damage or consider TCM failure on the sensor A input circuit.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The transmission park position sensor/switch "A" circuit has an open condition. This sensor tells the TCM and other modules whether the transmission is in Park. An open circuit means the signal wire is broken, disconnected, or has a poor connection, preventing the TCM from reliably determining if th...
The most common cause of P07B2 (Transmission Park Position Sensor/Switch "A" Circuit Open) is: Damaged or disconnected wiring harness between park position sensor A and TCM
Typical repair costs for P07B2 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle may not start if the TCM cannot verify Park position. The shift interlock may malfunction, and reverse lights or backup camera may not operate correctly. Drive cautiously and avoid situations requiring precise Park engagement confirmation. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P07B2 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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