P07BDTransmission Park Position Sensor/Switch B Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- With electronic gear selection the park position sensor/switch reports the park request or position. On GM's shift-by-wire selectors (2017 LaCrosse, XT4/XT5, Bolt EV, later SUVs and pickups) it is the P button, read by two redundant analog sensors A and B with separate 'released' and 'pressed' voltage zones. P07BD means sensor B's signal jumps or drops out intermittently. No manufacturer document available to us uses this code; GM covers intermittent P button problems as zone or correlation faults (P07BB, P07BE). A loose contact in the selector connector is the likely cause.
- What you may notice
- Check engine light, 'service transmission' or 'unable to shift' message
- Park cannot be selected by button, or the car will not shift out of P
- P button illumination off
- Likely causes
- LikelyLoose contact in the selector connector or harness
- PossibleSensor with intermittent fault
- RareOff-centre pressing or a hand resting on the button
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.