Transmission Park Position Sensor/Switch A Circuit High
What it means
P07B4 means the park position sensor/switch signal is reading too high (out of range). This switch confirms the gear selector is in Park; the transmission module uses it for the gear-position display and, on many vehicles, to allow the engine to crank. A circuit-high fault usually points to a short to voltage, a corroded connector, or a failed switch. It doesn't cause an engine no-start on its own, but a bad park/neutral signal can inhibit cranking on some designs.
Can I keep driving? Mostly a warning-light and gear-display issue, but because this switch confirms Park, some vehicles may crank only in certain positions or not at all — have it diagnosed.
Common symptoms
What you'll notice
- Check-engine light on
- Wrong or missing gear-position (PRNDL) display
- On some vehicles, no-crank in Park or start only in Neutral
- Occasional rough or unexpected shifts
Common causes
Most likely first
- Short to voltage or damaged wiring in the park position switch circuitLikely
- Faulty park position sensor/switchCommon
- Misadjusted park/neutral switchCommon
- Corroded connector at the switchLess often
- Transmission control module (TCM) faultLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the reported signal is high/out of range.
- Inspect the switch wiring and connector for shorts to voltage and corrosion.
- Check the park/neutral switch adjustment.
- Test the switch signal through the full range of gear positions; replace if faulty.
- If wiring and switch are good, suspect the TCM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P07B4?+
Can I just clear P07B4?+
Related codes
Often seen with P07B4
Read & clear P07B4 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.