P07B2
Transmission Park Position Sensor/Switch A Circuit/Open
Transmission
Generic OBD-II
Medium
What it means
P07B2 means the transmission control module sees an open (broken) circuit from the park position sensor/switch, which tells the system when the transmission is in Park. Because many vehicles only allow cranking in Park or Neutral, this fault can cause a no-crank condition, a wrong gear reading, or incorrect shifting. The usual cause is open or corroded wiring, a bad connector, or a failed sensor/switch.
Medium
Can I keep driving? The car may refuse to crank out of Park, or shift/read gear position incorrectly — get it checked promptly since it can leave you unable to start.
Common symptoms
What you'll notice
- Check-engine light on
- Engine won't crank in Park (or cranks in the wrong gear)
- Wrong or no gear indicated on the dash
- Rough or incorrect shifting
- Possible limp (fail-safe) mode
Common causes
Most likely first
- Faulty park/neutral position sensor or switchLikely
- Open, shorted, or corroded wiring in the sensor circuitCommon
- Corrosion or a poor connection at the sensor connectorCommon
- Misadjusted transmission range sensor/switchLess often
- Failed transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and scan for related transmission range sensor codes.
- Inspect the sensor connector and wiring for opens, corrosion, or damage — the most common cause of a circuit/open code.
- Verify the range sensor/switch adjustment and that it matches the actual shifter position.
- Test the park position sensor/switch signal through the range of gears; replace if it drops out or reads open.
- If wiring and sensor are good, evaluate the TCM. Clear and retest.
FAQ
Quick answers
Is it safe to drive with P07B2?+
If it's already running, it will usually still drive, but the bigger risk is that it may not crank the next time you park. Address it promptly so you're not stranded.
Can I just clear P07B2?+
It returns as soon as the circuit reads open again. The wiring, connector, or sensor needs repair, not just a reset.
Related codes
Often seen with P07B2
Read & clear P07B2 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