P22AB code meaning
O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 2)
Powertrain system Generic code P22xx codes Check engine light
What P22AB means
P22AB reports a break in the positive current control line of a wide-band probe mounted behind the catalyst or, on diesels, further down the aftertreatment on bank 1. On a Bosch-style five-wire probe this is the pump-current lead (IP/APE) through which the controller moves oxygen into or out of the pump cell. Chrysler lists the code for 2010-2012 Ram 2500/3500 pickups with the 6.7 Cummins in bulletins 25-004-12 and 25-002-14; the prescribed fix is new sensor connectors or an overlay harness before any sensor is replaced. GM names it in 21-NA-149 among faults from chafed harnesses on the 3.0 Duramax LM2. P22AC/P22AD cover low/high, P22B8 is bank 2, P2237 the upstream twin. The warning lamp comes on; the engine usually runs normally.
P22AB at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P22AB
- Check engine light
- Downstream oxygen reading frozen or missing in live data
- Related catalyst or aftertreatment monitors stay incomplete
Common causes of P22AB
- Most likelyCorroded, loose or poorly crimped terminal in the sensor or sensor-module connector
- PossiblePump-current wire broken or chafed through along the exhaust
- PossibleInternal open circuit in the downstream wide-band sensor
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank1 sensor2Oxygen sensor wiringECM
What each part of P22AB means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| AB | The exact fault in that area. |
What to do next
- Note P22AB 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 P22AB
What does P22AB mean?
P22AB means "O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 2)". P22AB reports a break in the positive current control line of a wide-band probe mounted behind the catalyst or, on diesels, further down the aftertreatment on bank 1. It is a generic code, so it means the same on every make.
Is it safe to drive with P22AB?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P22AB fail an emissions test?
Yes, it can. P22AB 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 P22AB to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P22AB clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.