P1840

Set by the manufacturer, so it means different things on different makes. 7 makes in the table below.

More codes than this one? Paste your whole scan

What P1840 means, by make 7 makes

Audi Pressure regulating valve 6-N371 short to positive 4748 18248
Chevrolet Internal Mode Switch S Circuit Low Voltage
Citroen Transmission Transfer Case Shift Motor Short Circuit To Battery
Ford Transmission Transfer Case Shift Motor Short Circuit To Battery
Peugeot Transmission Transfer Case Shift Motor Short Circuit To Battery
Subaru SPORT MODE SWITCH CIRCUIT (MANUAL SWITCH)
Volkswagen Pressure regulating valve 6-N371 short to positive 4748 18248

Each line is that manufacturer's own meaning for P1840. They are genuinely different faults, not rewordings of one, so a meaning listed against one make says nothing about the others. If your make is not listed, we do not hold it - your manufacturer's service information is the authority.

Code structure P1840

Powertrain

engine, transmission and emissions

Manufacturer-specific

Defined by the vehicle manufacturer, so the meaning varies between makes.

Fault index

identifies the specific fault

Powertrain Manufacturer-specific

Nearby codes in the P1 range

Manufacturer code meanings from kierandrewett/obd (b56a07a), used under the MIT licence. Copyright (c) Kieran Drewett. SpareRadar is not affiliated with the dataset's authors.