P07BA code meaning
Transmission Park Position Sensor/Switch B Circuit High
Powertrain system Generic code P07xx codes Check engine light
What P07BA means
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. P07BA is the same check as P07B4 for sensor B: above 853 counts (83.3 % of 5 V), ICCM above 70 %, after two trips. GM's bulletin for the 2017 LaCrosse, XT5 and Bolt EV lists it when the selector knob is not fully seated or the connector is not latched.
P07BA at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P07BA
- 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
Common causes of P07BA
- Most likelySignal shorted to positive or ground open
- PossibleSelector knob not fully seated or connector not latched
- PossibleSensor in the P button faulty
- Less likelySelector or control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Park position sensorElectronic range selectorSensor wiringTransmission control module
What each part of P07BA means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| BA | The exact fault in that area. |
What to do next
- Note P07BA and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P07BA
What does P07BA mean?
P07BA means "Transmission Park Position Sensor/Switch B Circuit High". With electronic gear selection the park position sensor/switch reports the park request or position. It is a generic code, so it means the same on every make.
Is it safe to drive with P07BA?
Drive gently and only to a workshop. With P07BA the car can go into limp mode (reduced power) to protect itself.
Will P07BA fail an emissions test?
P07BA is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P07BA to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P07BA clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.