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OBD-II · Engine and powertrain (P)

P245A

EGR cooler bypass control circuit circuit/open bank 1

What it means

The EGR cooler bypass flap lets exhaust gas skip the cooler when the engine is cold. The engine computer sees an open circuit in the bypass control.

Symptoms

  • engine warning light
  • usually no noticeable change
  • may slow warm-up or affect emissions

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01failed bypass solenoid or actuator
02unplugged or corroded connector
03broken wiring

What to check, step by step

  1. 01Inspect the connector and wiring to the bypass solenoid or actuator.
  2. 02On vacuum systems, check the vacuum hose and solenoid; on electric ones, run the actuator test.
  3. 03Check the flap moves freely and is not seized with soot.
  4. 04Replace the solenoid or actuator (sometimes only available with the EGR cooler).