OBD-II code · Powertrain (generic, extended)
P2AA5 EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 1
The output driver for the EGR cooler bypass actuator on bank 1 reports current or junction temperature above its protection threshold. Stalled actuator or short to ground.
Is it safe to drive with P2AA5?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyBypass actuator mechanically jammed
- PossibleControl wire shorted to ground
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–6 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Cooler Bypass Actuator B1, Ecm
Related codes
- P2AA6EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 2
- P2AA2Alternative Fuel Return Line Insufficient Flow
- P2AA3Cold Start EGR B Flow Insufficient Detected
- P2AA4Cold Start EGR B Flow Excessive Detected
- P2AA7Engine Coolant Bypass Valve B Position Sensor Circuit
- P2AA8Engine Coolant Bypass Valve B Position Sensor Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.