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OBD-II · Engine and powertrain (P)

P245D

EGR cooler bypass control circuit high bank 1

What it means

The EGR cooler bypass flap lets exhaust gas skip the cooler when the engine is cold. The control circuit voltage is above the valid range.

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
01open circuit or short to voltage
02failed bypass solenoid
03corroded connector

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).