The control module detected a short circuit to ground in the Transmission Transfer Case Contact Plate 'C' circuit. This is the manufacturer-specific definition used by Ford.
TuningBot DTC Database · v4.37.14
P1857 Diagnostic Trouble Code (4 interpretations)
4 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 Odd 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
2 interpretationsThe control module registered the fault condition described as "Load Signal Error Message From ECU". This is the manufacturer-specific definition used by Audi.
Possible causes
- Vacuum leak
- intake system - air leak
The control module registered the fault condition described as "Load Signal: Error Message from ECU". This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 18265. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).
Symptoms
Malfunction Indicator Light (MIL) active
Possible causes
Fault Code(s) stored in Engine Control Unit (ECU)
Recommended checks
Check Engine Control Unit for Fault Code(s)
Related and nearby codes
How to read P1857
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 P1857
What does P1857 mean?
Diagnostic Trouble Code (4 interpretations). The control module detected a short circuit to ground in the Transmission Transfer Case Contact Plate 'C' circuit. This is the manufacturer-specific definition used by Ford.
Is P1857 generic or manufacturer-specific?
P1857 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 P1857 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
