Wiring fault such as short to voltage, chafed insulation or high resistance in the sensor circuit; Corroded, loose or contaminated connector at the sensor or control unit; Faulty park position sensor or switch; Selector, linkage or cable out of adjustment, so the sensor reads a position that does not match the selector; Fluid ingress or contamination at the sensor, where the design allows it; Low or poor supply voltage or a poor earth affecting the sensor reference; Fault in the transmission control unit, or outdated software where the manufacturer lists it as a known cause.

P07B6

Transmission Park Position Sensor/Switch A Circuit Performance High.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
B6: FaultThe specific fault in that area

What it means

P07B6 means the transmission control unit has seen the signal from the park position sensor or switch (circuit A) reading higher than expected, or higher than it should for the selector position or vehicle state. The module compares this input with the range sensor, selector position and vehicle speed, and sets the code when the value is too high or implausible. The exact sensor type and layout depend on the model and transmission.

Symptoms

Gearbox warning light or check engine light on
Engine will not start, or starts only in Neutral or at certain selector positions
Selector position on the dash shows the wrong gear or flickers
Park position not recognised, or the car feels as if it is not locked in Park
Harsh, delayed or missing gear engagement
Transmission may default to a limited operating mode

Possible causes

Wiring fault such as short to voltage, chafed insulation or high resistance in the sensor circuitlikely
Corroded, loose or contaminated connector at the sensor or control unitlikely
Faulty park position sensor or switchlikely
Selector, linkage or cable out of adjustment, so the sensor reads a position that does not match the selectorpossible
Fluid ingress or contamination at the sensor, where the design allows itpossible
Low or poor supply voltage or a poor earth affecting the sensor referencepossible
Fault in the transmission control unit, or outdated software where the manufacturer lists it as a known causerare

How to diagnose

Read all stored codes and freeze frame data, noting selector position, vehicle speed and battery voltage when the code set, and check for other range sensor or network codes
Check the battery condition and charging voltage, as low voltage can cause false readings
Inspect the sensor wiring and connectors for damage, corrosion, water ingress, bent pins or loose terminals
Using live data, compare the park sensor reading with the selector position as you move through each gear and check for jumps or dropouts
Wiggle-test the harness and connector while watching live data to find intermittent faults
Check the selector linkage or cable adjustment and the selector assembly for wear or damage, following the manufacturer's procedure
Measure the sensor supply, signal and earth against the manufacturer's specification, and check the harness for continuity and shorts
Check for any published software update or service bulletin for the model and transmission

How to fix

Repair or replace damaged wiring and terminals in the sensor circuit
Clean, secure or replace a corroded or loose connector
Replace the park position sensor or switch if it fails testing
Adjust or repair the selector linkage or cable to the specified setting
Correct charging or earth faults found during testing
Update the transmission control unit software only if an applicable update exists, or repair or replace the unit once other causes are ruled out

Can I keep driving?

Medium severity

The car may still drive, but the park position input is unreliable, so it may fail to start, not hold in Park properly or enter a limited mode. Always use the handbrake when parking and get it diagnosed soon.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.