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P1789
Ignition Supply Malfunction
Jaguar · engine
Data confidence
62%
The control module detected improper operation of the Ignition Supply. This is the manufacturer-specific definition used by Jaguar.
TuningBot DTC Database · v4.37.15
P1789 Jaguar - Ignition Supply Malfunction
Manufacturer-specific interpretation for Jaguar. All interpretations of P1789
What P1789 means
Related and nearby codes
How to read P1789
P
Powertrain: engine, transmission and driveline systems.
1
Manufacturer-defined range: the meaning can differ between brands.
789
Specific fault index within the subsystem.
Frequently asked questions about P1789
What does P1789 mean?
Ignition Supply Malfunction. The control module detected improper operation of the Ignition Supply. This is the manufacturer-specific definition used by Jaguar.
Is P1789 generic or manufacturer-specific?
P1789 is a manufacturer-specific code. In this database it is documented for: Jaguar. The same number can mean something different on other brands.
Can TuningBot remove P1789 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.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic