P07BETransmission Park Position Sensor/Switch A/B Correlation
- 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. P07BE compares the two redundant sensors in the P button: both report a valid but different state – one pressed, one released – for about 30–60 s, checked only without circuit faults and at low speed. GM's petrol engine modules and ICCM rate it after two trips, the 2018 diesel engine module after one. GM's bulletins note that off-centre pressing or a hand resting on the button can set it; the remedy is control module software or a new shift knob.
- 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
- LikelyOff-centre pressing or a hand resting on the P button
- PossibleControl module software
- PossibleOne of the two sensors faulty or sticking
- RareShift knob worn or not seated
- 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.