TuningBot DTC Database · v4.37.14
3 manufacturer-specific interpretations across 3 manufacturers in the TuningBot DTC database.
ChevroletThe control module detected that the signal in the Internal Mode Switch 'A' circuit stayed above the expected operating range. This is the manufacturer-specific definition used by Chevrolet.
FordThe control module detected improper operation of the Transmission Transfer Case Shift Motor circuit. This is the manufacturer-specific definition used by Ford.
PSAThe control module detected that the Mechanical or hydraulic fault on the engine brake function in the first sequential mode was not coherent with related operating data. Documented for the AM6/AT6 automatic gearbox ECU on Peugeot applications; the same PSA control units are also fitted to Citroën models.
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Diagnostic Trouble Code (3 interpretations). The control module detected that the signal in the Internal Mode Switch 'A' circuit stayed above the expected operating range. This is the manufacturer-specific definition used by Chevrolet.
P1838 is a manufacturer-specific code. In this database it is documented for: Chevrolet, Ford, PSA. 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 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.
Understand the system behind this code: Diagnostic Strategy and DTC Logic
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