P07B7
Transmission Park Position Sensor/Switch A Circuit Intermittent/Erratic
Transmission / park position
Generic OBD-II
Medium
What it means
P07B7 means the signal from the transmission's park position sensor/switch "A" is dropping out or reading erratically rather than steadily. That switch tells the vehicle when the transmission is in Park, so an intermittent fault can upset the gear-position display and, on some vehicles, the neutral-safety start circuit — most often from a loose or corroded connector.
Medium
Can I keep driving? Usually drivable, but on some vehicles the engine may intermittently refuse to crank unless the switch confirms Park or Neutral. Get it fixed to avoid being stranded.
Common symptoms
What you'll notice
- Check-engine light on
- Intermittent no-crank unless the shifter is jiggled in Park or Neutral
- Wrong or flickering gear-position (PRNDL) display
- Shift-interlock trouble releasing out of Park
- Occasional rough or unexpected shift behavior
Common causes
Most likely first
- Intermittent open, short, or chafe in the park position sensor/switch wiringLikely
- Loose, corroded, or backed-out connector at the switchCommon
- A worn or failing park position sensor/switchCommon
- Misadjusted park/neutral switchLess often
- Failed transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Scan for codes and read freeze-frame data to capture when the fault sets.
- Because it's intermittent, wiggle-test the switch harness and connector while watching the park/neutral signal on a scan tool.
- Inspect the connector for corrosion, spread pins, or moisture and repair as needed.
- Check the switch adjustment and test its signal across the shifter range against spec.
- Replace the park position sensor/switch if it reads erratically; suspect the TCM only if wiring and switch are good. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P07B7?+
Once running, the car generally drives normally, but because this switch is tied to the start/interlock circuit you could occasionally get a no-crank until it's confirmed in Park or Neutral. Fix it before it leaves you stranded.
Can I just clear P07B7?+
It will clear, but an intermittent switch or wiring fault brings it back. Finding the loose or corroded connection is the real repair.
Related codes
Often seen with P07B7
Read & clear P07B7 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX