P2AB3Cold Start Intake Manifold Runner Control Stuck Open Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2AB3 is part of the cold-start component checks that CARB phases in for 20, 50 and 100 percent of new vehicles in 2026, 2027 and 2028. Right after a start that follows a long standstill, charge motion, runner and swirl valves must follow the cold-start command clearly, toward the target and further than they would at a start without that strategy. The test only counts after at least six hours off, at -6.7 °C or warmer, with coolant no more than 15 °C above ambient. P2AB3 means the runner control on bank 1 stays in its open position when the cold-start strategy calls for a change. No manufacturer documents P2AB3 publicly. For comparison, Ford's ordinary IMRC check runs continuously above 40 °F coolant and judges stuck plates after 4 events (P2004). Weaker mixture motion raises cold emissions.
- What you may notice
- Check engine light on
- Rougher idle in the first minutes after a cold start
- Higher cold-start emissions, otherwise often unnoticed
- Likely causes
- LikelyActuator or vacuum unit too weak to move the flaps when cold
- PossibleFlap shaft stiff from carbon or oil deposits
- PossibleLinkage detached or broken between actuator and shaft
- 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: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.