P2AA6EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2AA6 is the bank 2 version of the bypass driver protection code. It only exists on engines with a separate EGR cooler and bypass actuator for the second cylinder bank, typically V engines whose banks each have their own exhaust manifold feeding EGR. The output stage for that actuator reports excessive current or junction heat and shuts itself off, which leaves the flap where it was. No manufacturer documents P2AA6 publicly. GM's diesel tables, which define the bank 1 code P2AA5 with a 170 °C driver limit and a Type B rating, show no bank 2 counterpart, as those engines use a single bypass. Causes match bank 1: a binding flap, a damaged motor or a partial short. Circuit faults on bank 2 are P248E, P2490 and P2491; a stuck flap is P24A6.
- What you may notice
- Malfunction indicator lamp on
- Bank 2 bypass flap stays in its last position
- Possible NOx or EGR temperature codes for bank 2
- Likely causes
- LikelyBank 2 bypass flap binding on soot or corrosion
- PossibleInternal fault in the bank 2 actuator motor
- PossiblePartial short in the bank 2 actuator wiring
- RareFaulty driver stage in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.