Powertrain, generic (extended)

P2498 EGR Cooler Bypass Position Sensor Range/Performance (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

With P2498 the bank 2 bypass position signal is electrically valid but not believable, for example because it does not change when the flap is commanded, settles at an unexpected value or no longer matches the end stops learned earlier. There is no public manufacturer description for this bank 2 code. The closest documented case is bank 1: GM's 2015 LML Duramax showed P2493 together with other bypass sensor codes, and GM's answer was a complete new bypass valve, because sensor and valve form one unit. On a twin-cooler engine the same reasoning applies to the second bank, so a sensor fault and a mechanically binding flap must be told apart with live data before parts are ordered. The bank 1 version is P2493; the actuator side of bank 2 is P248F.

Likely causes

Worn bank 2 bypass valve with built-in sensor
Flap binding so the sensor reads a position other than commanded
End-stop learn values invalid after a repair

Symptoms

  • Check engine light on
  • Measured and commanded bypass position differ on bank 2

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–900
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egr cooler bypass position sensor b2

Related codes

P2493P2497P2499P249AP248F

References: law.cornell.edu, static.nhtsa.gov.