P245A code meaning
EGR Cooler Bypass Control Circuit/Open (Bank 1)
Powertrain system Generic code P24xx codes Check engine light
What P245A means
The bypass lets cold-start EGR skip the cooler and is switched back to cooling once the engine is warm. P245A flags the bank 1 control circuit, usually as an open. GM's 2017 tables show both actuator types: on the Duramax with a DC-motor flap the controller sees a load resistance above 200 kOhm while the H-bridge is off and needs 160 failures in 200 samples, while the vacuum-switched version needs 24 of 30 samples with the flap commanded to cooling; both are Type B. Ford used P245A differently on its 2013 to 2015 6.7 L Power Stroke, as an intrusive check that fails when the gas temperature after the cooler moves by less than 3 °C per second after the flap switches; in 2023 that test carries P245B. Ford reflashed 2018 to 2019 Super Duty PCMs for P245A. Shorts are P245C and P245D, bank 2 is P248E.
P245A 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 P245A
- Malfunction indicator lamp on
- EGR cooler bypass no longer switching; possible P2457 or P24A5 as follow-up
Common causes of P245A
- Most likelyOpen wire or unplugged connector at the bypass actuator
- PossibleActuator motor or solenoid winding open
- Less likelyControl software needing an update (some Ford diesels)
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 b1
What each part of P245A 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). |
| 5A | The exact fault in that area. |
What to do next
- Note P245A 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 P245A
What does P245A mean?
P245A means "EGR Cooler Bypass Control Circuit/Open (Bank 1)". The bypass lets cold-start EGR skip the cooler and is switched back to cooling once the engine is warm. It is a generic code, so it means the same on every make.
Is it safe to drive with P245A?
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 P245A fail an emissions test?
Yes, it can. P245A 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 P245A 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 P245A 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.