TuningBot DTC Database · v4.37.15
Manufacturer-specific interpretation for Volvo. All interpretations of P1638
The control module detected a fault associated with the Engine control module (ECM), internal temperature high - stage 2 circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Volvo.
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Engine control module (ECM), internal temperature high - stage 2. The control module detected a fault associated with the Engine control module (ECM), internal temperature high - stage 2 circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Volvo.
P1638 is a manufacturer-specific code. In this database it is documented for: Volvo. 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. 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.
Understand the system behind this code: Diagnostic Strategy and DTC Logic
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