P2AB4Cold Start Intake Manifold Runner Control Stuck Open Bank 2
- 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
- P2AB4 is the bank 2 version of the open-stuck check during cold start, so it only appears on engines with a separate runner control for each cylinder bank, typically V or flat engines. The runner flaps of the second bank fail to leave their open position as long as the cold-start routine runs, so that bank burns its mixture with less charge motion than intended. No manufacturer documents P2AB4 publicly; the requirement comes from CARB's cold-start component monitoring, which only applies once the engine has been off for six hours or longer. Ford's 2020 to 2023 gasoline summary shows the conventional split for vacuum-actuated V engines, with P2004 for bank 1 and P2005 for bank 2. Comparing bank 2 with bank 1 helps: if only one side lags, look at that actuator, its vacuum line and its linkage. Bank 1 is P2AB3.
- What you may notice
- Check engine light on
- Uneven running between the banks shortly after a cold start
- Higher cold-start emissions
- Likely causes
- LikelyLeaking vacuum line or diaphragm on the bank 2 actuator
- PossibleBank 2 flap shaft stiff from deposits
- PossibleElectric actuator for bank 2 defective
- 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.