Powertrain
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Lights the check engine lamp
P2AA5: EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 1
Standardized SAE J2012 code · P2Axx codes
What does P2AA5 mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Common causes
- High Bypass actuator mechanically jammed
- Medium Control wire shorted to ground
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2AA5 on the same make and model first.
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