Faulty or misadjusted transmission range sensor or Park/Neutral switch; Damaged, chafed or corroded wiring in the Park sensor circuit, including a short to earth; Loose, corroded or water-damaged connector at the sensor or control unit; Worn or misadjusted selector lever, cable or linkage so the position does not match the sensor; Low or incorrect supply or reference voltage to the sensor; Fault inside the transmission or engine control unit; Outdated control unit software where a known fault exists for that model.

P07B5

Transmission Park Position Sensor/Switch A Circuit Performance/Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
B5: FaultThe specific fault in that area

What it means

P07B5 is a generic powertrain code meaning the control unit has found a performance fault or a low signal in the Park position sensor or switch 'A' circuit. The transmission or engine control unit saw a signal that was too low, or one that did not agree with the selector position, other gear position inputs or vehicle speed. The exact layout of the Park sensor, and whether it is built into the selector or the transmission range sensor, depends on the model and transmission.

Symptoms

Engine will not crank or start in Park, or only starts in Neutral
Gear selector position shown wrongly on the dashboard
Reversing lights not working or staying on
Harsh, delayed or no engagement when moving the selector
Transmission warning light or malfunction message
Car goes into limp mode or a fixed gear

Possible causes

Faulty or misadjusted transmission range sensor or Park/Neutral switchlikely
Damaged, chafed or corroded wiring in the Park sensor circuit, including a short to earthlikely
Loose, corroded or water-damaged connector at the sensor or control unitlikely
Worn or misadjusted selector lever, cable or linkage so the position does not match the sensorpossible
Low or incorrect supply or reference voltage to the sensorpossible
Fault inside the transmission or engine control unitrare
Outdated control unit software where a known fault exists for that modelrare

How to diagnose

Read all stored codes and freeze frame data, noting selector position, vehicle speed and whether the fault is current or intermittent
Check for related codes for other gear position, supply voltage or communication faults, and deal with those first
Inspect the selector linkage or cable and the sensor connector and wiring for damage, corrosion, water or oil contamination
Using live data, move the selector through every position and check the displayed Park signal changes cleanly and matches the lever
Check the sensor supply, earth and signal circuits with a multimeter against the manufacturer's specification, including voltage drop and continuity
Wiggle test the harness with live data on display to find intermittent faults
Check the sensor adjustment and selector linkage alignment to the manufacturer's procedure for that model
Check for software updates or technical bulletins for the vehicle before considering the control unit

How to fix

Repair or replace damaged wiring and clean or replace corroded connector terminals
Replace the transmission range sensor or Park switch if its signal is faulty
Adjust or replace the selector cable or linkage and set the sensor position to specification
Restore correct supply and earth to the sensor by repairing the cause of the voltage fault
Update the control unit software only if a known fault exists for that vehicle, or replace a confirmed faulty control unit

Can I keep driving?

Medium severity

The car may be driveable, but it could fail to restart or go into limp mode, so get it checked soon. Avoid relying on Park alone, and use the handbrake whenever you stop.

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