P0640: The intake air heater control has an electrical fault
The intake air heater control has an electrical fault. It may be the part itself, its connector or the wiring.
| Code | P0640 |
|---|---|
| System | Engine and transmission |
| Group | P06xx, Control unit and auxiliary outputs |
| Type | Generic: it means the same on every make |
How to read and clear P0640 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 P0640 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
- P063C The generator voltage detection gives a lower signal than normal
- P063D The generator voltage detection gives a higher signal than normal
- P063E The input needed to configure the throttle control unit automatically is missing
- P063F The automatic configuration input for the engine coolant temperature sensor is
- P0641 Sensor reference voltage A: circuit open or faulty
- P0642 Sensor reference voltage A: circuit low
- P0643 Sensor reference voltage A: circuit high
- P0644 The driver display series communication has an electrical fault
- P0600 Serial communication link fault
- P0601 Internal control module memory checksum error
- P0602 Control module programming error
- P0603 Internal control module keep alive memory (KAM) error
What does code P0640 mean?
The intake air heater control has an electrical fault. It may be the part itself, its connector or the wiring.
How do you clear P0640?
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, P0640 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.
