P045D code meaning
EGR B Control Circuit High
Powertrain system Generic code P04xx codes Check engine light
What P045D means
Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. EGR B is a second EGR valve next to valve A – on diesels with two EGR circuits the low-pressure valve, which takes exhaust after the particulate filter and feeds it in before the turbo compressor. GM's diesels of 2016–18 and FCA's 2.2-litre diesel in the Jeep Wrangler use it. P045D means the drive circuit of valve B is shorted to the supply, or the actuator draws overcurrent with the driver on (comparable to P0490 for valve A). The driver is switched off and EGR B stays inactive. GM lists this code among those that switch off the low-pressure EGR position control, but publishes no thresholds for it; the description follows the comparable valve A checks and CARB, which requires output circuits to be monitored.
P045D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P045D
- Check engine light on
- Low-pressure EGR switched off, possibly higher NOx
- Usually no change in driving
Common causes of P045D
- Most likelyControl wire shorted to a supply wire
- PossibleActuator motor shorted internally (overcurrent)
- PossibleMoisture or corrosion in the connector
- Less likelyEngine module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR valve bLow pressure EGR valveEGR wiringEngine control module
What each part of P045D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 5D | The exact fault in that area. |
What to do next
- Note P045D 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 P045D
What does P045D mean?
P045D means "EGR B Control Circuit High". Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. It is a generic code, so it means the same on every make.
Is it safe to drive with P045D?
Drive gently and only to a workshop. With P045D the car can go into limp mode (reduced power) to protect itself.
Will P045D fail an emissions test?
Yes, it can. P045D 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 P045D to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P045D 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.