U0642: The evaporative emission system pressure sensor circuit B is not answering on
The evaporative emission system pressure sensor circuit B is not answering on the car network. It is usually that control unit, its power supply or the network wiring.
| Code | U0642 |
|---|---|
| System | Communication network |
| Group | U06xx, Lost communication with sensors and control units |
| Type | Generic: it means the same on every make |
How to read and clear U0642 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 U0642 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
- U063D The high voltage electronics coolant pump is not answering on the car network
- U063E The exhaust heat exchanger bypass valve actuator A is not answering on the car
- U063F The engine coolant flow control valve position sensor is not answering on the
- U0641 The evaporative emission system pressure sensor circuit A is not answering on
- U0643 The turbocharger A temperature sensor is not answering on the car network
- U0644 The wastegate position sensor A is not answering on the car network
- U0645 The active air deflector module is not answering on the car network
- U0646 The engine electronics coolant pump A is not answering on the car network
What does code U0642 mean?
The evaporative emission system pressure sensor circuit B is not answering on the car network. It is usually that control unit, its power supply or the network wiring.
How do you clear U0642?
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, U0642 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.
