P041E code meaning
EGR Temperature Sensor B Circuit Intermittent/Erratic
Powertrain system Generic code P04xx codes Check engine light
What P041E means
Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. EGR temperature sensor B is the second temperature sensor in the EGR path; on GM diesels it sits before the cooler, on Ford diesels after it. P041E means its signal jumps. GM's diesels of 2016–18, the only documented users, set it when the measured resistance changes by more than 25 Ω between two samples 100 ms apart – faster than any real temperature change, so a loose contact or cracked sensor is the cause (40 of 50 samples, MIL after two trips). Dependent checks such as EGR cooler efficiency are then suspended.
P041E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.5 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P041E
- Check engine light on, may come and go
- Usually no noticeable symptom
- Further EGR temperature or cooler checks suspended
Common causes of P041E
- Most likelyLoose contact or corrosion at the sensor connector
- PossibleHarness chafed or broken (heat at the EGR pipe)
- PossibleSensor cracked internally (thermal cycling)
- Less likelyEngine module or ground connection
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR temperature sensor bSensor wiringEngine control module
What each part of P041E 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). |
| 1E | The exact fault in that area. |
What to do next
- Note P041E 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 P041E
What does P041E mean?
P041E means "EGR Temperature Sensor B Circuit Intermittent/Erratic". 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 P041E?
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 P041E fail an emissions test?
Yes, it can. P041E 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 P041E to fix?
Difficulty: easy. A typical repair takes 0.5 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P041E 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.