Generic SAE-standard code: same meaning on every make.
640
Specific fault index within the subsystem.
Frequently asked questions about U0640
What does U0640 mean?
Lost Communication With EVAP Fuel Vapor Temperature Sensor Circuit. The control module detected improper operation of the Lost Communication With EVAP Fuel Vapor Temperature circuit.
Is U0640 generic or manufacturer-specific?
U0640 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove U0640 at file level?
Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U0640 is removable in your case.
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