P2ABB code meaning
Wastegate Position Sensor B Circuit Low
Powertrain system Generic code P2Axx codes Check engine light
What P2ABB means
P2ABB reports that the position signal of the turbocharger B wastegate is too low, as a short to ground, a broken signal or supply wire or a failed sensor would cause. Ford's 2020-23 gasoline summary applies the same window as for turbo A and sets the code below 0.50 V after 4 s. In that document the threshold line for this sensor names sensor A, evidently an editing slip, since the heading and code title both refer to B. Ford lists P2ABB in TSB 23-2353 and SSM 54083 for twin-turbo applications such as the F-150 3.5L and Expedition/Navigator. The two GM tables reviewed here (2019 L3B, 2025) contain only the A codes. On a V6 the bank 2 flap can then no longer be positioned, so expect reduced boost and power. High is P2ABC, the bank 1 counterpart P2AB8.
P2ABB at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2ABB
- Check engine light
- Less power, especially when accelerating hard
Common causes of P2ABB
- Most likelySensor wire chafed to ground near the bank 2 turbocharger
- PossibleOpen reference supply or signal wire, loose connector
- PossiblePosition sensor in wastegate actuator B failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Wastegate position sensor bWiring harnessECM
What each part of P2ABB means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| BB | The exact fault in that area. |
What to do next
- Note P2ABB 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 P2ABB
What does P2ABB mean?
P2ABB means "Wastegate Position Sensor B Circuit Low". P2ABB reports that the position signal of the turbocharger B wastegate is too low, as a short to ground, a broken signal or supply wire or a failed sensor would cause. It is a generic code, so it means the same on every make.
Is it safe to drive with P2ABB?
Drive gently and only to a workshop. With P2ABB the car can go into limp mode (reduced power) to protect itself.
Will P2ABB fail an emissions test?
Yes, it can. P2ABB is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2ABB to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2ABB clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.