TuningBot DTC Database · v4.37.15
Manufacturer-specific interpretation for Ford. All interpretations of P1391
The control module detected that the signal in the Glow Plug circuit stayed below the expected operating range. This is the manufacturer-specific definition used by Ford.
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Glow Plug Circuit Low Input Bank 1. The control module detected that the signal in the Glow Plug circuit stayed below the expected operating range. This is the manufacturer-specific definition used by Ford.
P1391 is a manufacturer-specific code. In this database it is documented for: Ford. 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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