The control module detected improper operation of the Transmission Transfer Case Contact Plate 'D' circuit. This is the manufacturer-specific definition used by Ford.
TuningBot DTC Database · v4.37.14
P1858 Diagnostic Trouble Code (3 interpretations)
3 manufacturer-specific interpretations across 3 manufacturers in the TuningBot DTC database.
Ford
1 interpretation
Mitsubishi
1 interpretationThe control module detected a fault associated with the Even Number Gear Axle Interlock circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Mitsubishi.
VAG
1 interpretationThe control module registered the fault condition described as "Engine Speed Input Circuit Error Message From Engine Control". This is the manufacturer-specific definition used by Volkswagen.
Related and nearby codes
How to read P1858
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Frequently asked questions about P1858
What does P1858 mean?
Diagnostic Trouble Code (3 interpretations). The control module detected improper operation of the Transmission Transfer Case Contact Plate 'D' circuit. This is the manufacturer-specific definition used by Ford.
Is P1858 generic or manufacturer-specific?
P1858 is a manufacturer-specific code. In this database it is documented for: Ford, Mitsubishi, VAG. The same number can mean something different on other brands.
Can TuningBot remove P1858 at file level?
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.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic
