P2BACNOx Exceedence - Deactivation of EGR
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2BAC is reserved for the case where exhaust gas recirculation is not just off target but shut down altogether, whether by an unplugged valve, a blocked path, an unauthorised software change or a defect that leaves the valve closed. The European rules treat this as a typical tampering scenario: Regulation (EU) No 582/2011, Annex XIII, carries an EGR valve counter that ends first in a warning and then in inducement. California's rule, section (f)(6.2.1) of 13 CCR 1968.2, requires a malfunction when EGR flow is absent although expected. No maker documents P2BAC publicly. Compared with P2BAB, which covers wrong flow, this code needs a hard stop; component codes for valve circuit or position usually come along and point to the cause.
- What you may notice
- MIL and NOx warning, later inducement
- Harder, louder combustion
- EGR circuit or position codes stored as well
- Likely causes
- LikelyEGR valve unplugged, blanked off or disabled
- PossibleEGR valve stuck closed or actuator failed
- PossibleModified engine software with EGR switched off
- RareOpen or short in the EGR valve circuit
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.