P248EEGR Cooler Bypass Control Circuit/Open (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P248E is the bank 2 counterpart of P245A: the engine controller sees no proper load on the output that drives the EGR cooler bypass of the second cylinder bank, most often because the circuit is open. Only engines with a separate EGR path per bank can set it, which in practice means V engines with two coolers. No manufacturer documents this code publicly; the published diesel tables we checked only list bank 1. For comparison, GM's 2017 Duramax tables flag the bank 1 DC-motor flap when the load resistance with the H-bridge switched off exceeds 200 kOhm, rated Type B. CARB requires such actuators to be checked as comprehensive components. With the flap unpowered, warm-up or cooling of the recirculated gas is no longer controlled on that bank.
- What you may notice
- Check engine light on
- Longer warm-up or higher NOx on one bank because the bypass stays put
- Likely causes
- LikelyUnplugged connector or broken wire at the bank 2 bypass actuator
- PossibleOpen motor or solenoid winding in the bank 2 actuator
- RareFaulty output stage in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.