P041C code meaning
EGR Temperature Sensor B Circuit Low
Powertrain system Generic code P04xx codes Check engine light
What P041C means
EGR temperature sensor B measures the gas temperature in the EGR path – for cooler monitoring, component protection and the EGR model. Whether it sits before or after the cooler depends on the maker: GM diesels have sensor A after and B before the cooler, Ford diesels sensor B after it. Like a coolant sensor it is an NTC, so a low voltage means hot. P041C means the signal is below its lower limit – very hot or shorted to ground; Ford puts below 0.10 V at about 961 °C. Thresholds: Ford diesel below 0.10 V for 3 s, Ford gasoline below 0.32 V for 5 s, GM's Duramax LML below 0.46 V for 5 s, GM 2018 a resistance below 164 Ω; MIL after two trips. A substitute value is used and the EGR cooler check (P2457) is suspended.
P041C 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 P041C
- Check engine light on
- Usually no change in driving
- Substitute value used, EGR cooler check suspended
Common causes of P041C
- Most likelySignal wire shorted to ground
- PossibleSensor shorted internally
- PossibleMoisture in the connector
- Less likelyActual overtemperature (cooler or coolant problem)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR temperature sensor bEGR coolerSensor wiringEngine control module
What each part of P041C 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). |
| 1C | The exact fault in that area. |
What to do next
- Note P041C 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 P041C
What does P041C mean?
P041C means "EGR Temperature Sensor B Circuit Low". EGR temperature sensor B measures the gas temperature in the EGR path – for cooler monitoring, component protection and the EGR model. It is a generic code, so it means the same on every make.
Is it safe to drive with P041C?
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 P041C fail an emissions test?
Yes, it can. P041C 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 P041C 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 P041C 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.