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. P07B2 means the circuit of sensor A is open: the module sees a missing or undefined signal. No manufacturer document available to us uses this code; GM covers an open analog circuit under its low and high codes (P07B3/P07B4), which CARB allows when an open cannot be told apart from an out-of-range value. Park may then not be selectable by button.
Medium severity. Can I keep driving?Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
Symptoms
- 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
Most likely causes
- Wire or connector to the selector open
- Connector not latched
- Sensor faulty
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
What each character of P07B2 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 7: Transmission
- B2: Specific fault in that system
Frequently asked questions
Can I keep driving with code P07B2?
Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
What causes code P07B2?
The most common causes are: wire or connector to the selector open; connector not latched; sensor faulty.
Related codes
- P07B3Transmission Park Position Sensor/Switch A Circuit Low
- P07B4Transmission Park Position Sensor/Switch A Circuit High
- P07B7Transmission Park Position Sensor/Switch A Circuit Intermittent/Erratic
- P07B8Transmission Park Position Sensor/Switch B Circuit/Open
- P07BETransmission Park Position Sensor/Switch A/B Correlation
- P0705Transmission Range Sensor A Circuit (PRNDL Input)
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.