P245D code meaning
EGR Cooler Bypass Control Circuit High (Bank 1)
Powertrain system Generic code P24xx codes Check engine light
What P245D means
P245D is the short-to-supply case of the bank 1 bypass circuit. For the Duramax with a DC-motor bypass, GM's 2017 tables watch the current through the H-bridge while it drives the flap: more than 8 A in 160 of 200 samples sets a Type B fault. On the vacuum-switched version the check looks at resistance to the supply side, and the 2014 tables describe high voltage while the driver is on. Ram issued a PCM software update in 2025 for 2024 heavy-duty pickups with the 6.7 L Cummins that set P245D, together with other air handling codes, to remove false actuator faults, so the software level should be checked before the harness is opened. In a genuine case a wire touching a battery feed or an actuator with a low-resistance winding is found. Open circuit is P245A, short to ground P245C, bank 2 is P2491.
P245D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P245D
- Malfunction indicator lamp on
- Bypass actuator switched off by the controller and left in default position
Common causes of P245D
- PossibleControl software reporting a false actuator fault (known on some Ram diesels)
- PossibleControl wire shorted to a battery or ignition feed
- PossibleActuator motor drawing excessive current (low-resistance winding, binding)
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 P245D 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). |
| 5D | The exact fault in that area. |
What to do next
- Note P245D 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 P245D
What does P245D mean?
P245D means "EGR Cooler Bypass Control Circuit High (Bank 1)". P245D is the short-to-supply case of the bank 1 bypass circuit. It is a generic code, so it means the same on every make.
Is it safe to drive with P245D?
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 P245D fail an emissions test?
Yes, it can. P245D 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 P245D to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P245D 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.