P248B: The AdBlue heater A detection gives a higher signal than normal
The AdBlue heater A detection gives a higher signal than normal. It is usually the part, its wiring or a connector with poor contact.
| Code | P248B |
|---|---|
| System | Engine and transmission |
| Group | P24xx, EGR, EVAP and particulate filter |
| Type | Generic: it means the same on every make |
How to read and clear P248B with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P248B with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2487 The exhaust gas temperature sensor (bank 2
- P2488 The exhaust gas temperature sensor (bank 2
- P2489 The exhaust gas temperature sensor (bank 2, sensor 5) fails now and then
- P248A The AdBlue heater A detection gives a lower signal than normal
- P248C The AdBlue heater B detection gives a lower signal than normal
- P248D The AdBlue heater B detection gives a higher signal than normal
- P248E The EGR cooler bypass control (bank 2) has a broken or disconnected wire
- P248F The EGR cooler bypass control (bank 2) gives readings outside the normal range
- P2400 EVAP leak detection pump control circuit open or faulty
- P2413 Exhaust gas recirculation (EGR) system performance
- P2414 O2 sensor exhaust sample error (bank 1, sensor 1)
- P2425 EGR cooler valve control circuit open or faulty
What does code P248B mean?
The AdBlue heater A detection gives a higher signal than normal. It is usually the part, its wiring or a connector with poor contact.
How do you clear P248B?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P248B comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
