TuningBot DTC Database · v4.37.14
Manufacturer-specific interpretation for Chevrolet. All interpretations of P1421
The control module detected that the signal in the Intake Air Low Pressure Switch circuit stayed above the expected operating range. This is the manufacturer-specific definition used by Chevrolet.
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Intake Air Low Pressure Switch Circuit High Voltage. The control module detected that the signal in the Intake Air Low Pressure Switch circuit stayed above the expected operating range. This is the manufacturer-specific definition used by Chevrolet.
P1421 is a manufacturer-specific code. In this database it is documented for: Chevrolet. The same number can mean something different on other brands.
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Understand the system behind this code: Diagnostic Strategy and DTC Logic
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