What it means
The signal from park position sensor or switch A is outside the expected performance range on the low side.
At a glance
- Usually lights the check-engine light
How it works
Park position sensor or switch A provides a signal that the transmission control module uses to assess park position. P07B5 sets when the signal is outside the expected performance range on the low side, even if it is not simply a fixed short-to-ground condition.
Common causes
Most likely first.
- Park position sensor or switch A fault
- Damaged wiring or poor connector contact
- Sensor misalignment or mechanical wear
- Fault in the transmission control module input circuit
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Record freeze-frame data and watch sensor A's live signal while selecting the relevant positions, noting when it falls below the expected performance range.
- Inspect sensor A's mounting and alignment, along with its connector, for looseness, wear, corrosion, or poor contact.
- Inspect circuit A wiring for damage or chafing that could weaken or distort the signal.
- Use the wiring diagram and manufacturer's procedure to test sensor A's signal and circuit continuity through the relevant operating states.
- If the sensor and wiring behave correctly, test the transmission control module input against the manufacturer's specification.
Common fixes
- Restore a loose or misaligned sensor A installation if the manufacturer's procedure allows adjustment.
- Repair poor connector contact or damaged circuit A wiring.
- Replace sensor or switch A if its low-side output remains out of range during testing.
- Repair the module input only if testing rules out sensor A and its circuit.
Can I keep driving?
Use the parking brake whenever parked and avoid driving if the gear indication or shifting becomes unreliable. If harsh shifts, slipping, or limp mode occur, stop driving because continued operation can increase transmission wear.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.