Code Definition

P1835 — Transmission Kickdown Switch Malfunction

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Isuzu

About P1835

P1835 is a manufacturer-specific powertrain diagnostic trouble code recorded for Isuzu vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1835 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This Isuzu DTC is set when the Transmission Control Module (TCM) or Powertrain Control Module (PCM) detects an invalid or missing signal from the kickdown switch circuit. The kickdown switch, typically located on or near the accelerator pedal, signals the module to command a downshift during heavy throttle input for extra acceleration. The code is triggered if the switch signal is stuck high or low, out of the expected voltage range, or not changing with throttle input as it should. The driver may notice the transmission fails to kick down for passing, holds gears oddly, or shifts inconsistent...

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