Cold start idle air control (IAC) system - RPM higher then expected
BMW · engine
Data confidence62%
The control module detected a fault associated with the Cold start idle air control (IAC) system - RPM higher then expected circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by BMW.
Traction Control System FI Data Line Failure
Honda · engine
Data confidence62%
The control module detected improper operation of the Traction Control System FI Data Line circuit. This is the manufacturer-specific definition used by Honda.
ETS warning lamp - short to positive
VAG · body
Data confidence62%
The control module detected a short circuit to battery voltage in the ETS warning lamp circuit. This is the manufacturer-specific definition used by Audi.
Possible causes
Instrumentation control module trouble code(s) stored
Powertrain: engine, transmission and driveline systems.
1
Manufacturer-defined range: the meaning can differ between brands.
677
Specific fault index within the subsystem.
Frequently asked questions about P1677
What does P1677 mean?
Diagnostic Trouble Code (3 interpretations). The control module detected a fault associated with the Cold start idle air control (IAC) system - RPM higher then expected circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by BMW.
Is P1677 generic or manufacturer-specific?
P1677 is a manufacturer-specific code. In this database it is documented for: BMW, Honda, VAG. The same number can mean something different on other brands.
Can TuningBot remove P1677 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.