P248E code meaning
EGR Cooler Bypass Control Circuit/Open (Bank 2)
Powertrain system Generic code P24xx codes Check engine light
What P248E means
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.
P248E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P248E
- Check engine light on
- Longer warm-up or higher NOx on one bank because the bypass stays put
Common causes of P248E
- Most likelyUnplugged connector or broken wire at the bank 2 bypass actuator
- PossibleOpen motor or solenoid winding in the bank 2 actuator
- Less likelyFaulty output stage in the engine control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR cooler bypass valve b2
What each part of P248E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 8E | The exact fault in that area. |
What to do next
- Note P248E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P248E
What does P248E mean?
P248E means "EGR Cooler Bypass Control Circuit/Open (Bank 2)". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P248E?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P248E fail an emissions test?
Yes, it can. P248E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P248E to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P248E clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.