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DTC codes / GM codes / P1835

P1835 · GMKick-Down Switch

P1835 on a GM vehicle indicates that the powertrain control module (PCM) has detected an implausible signal from the kick-down switch circuit, which is used to signal a forced downshift when the accelerator pedal is pressed fully. The PCM monitors the switch voltage and sets this code when the signal does not match expected values during key-on or driving conditions.

SystemPowertrain
Code typeGM specific
SeverityLow
Fix difficultyIntermediate
AreaTransmission

Symptoms you may notice

  • The malfunction indicator lamp (MIL) illuminates on the instrument cluster.
  • The transmission may not downshift when the accelerator pedal is pressed to the floor, reducing passing power.
  • Harsh or delayed shifts may occur as the PCM substitutes default shift logic.
  • In some cases, the transmission may stay in a single gear or enter limp mode.
  • Often no symptoms besides the warning light, especially if the switch fails only intermittently.

Common causes, most likely first

  1. Faulty kick-down switch located at the accelerator pedal assembly.
  2. Wiring harness damage (open, short, or chafed wires) between the switch and the PCM.
  3. Corroded or loose electrical connector at the switch or PCM.
  4. Misadjusted or sticking accelerator pedal mechanism preventing proper switch actuation.
  5. Failed PCM (rare, but possible after other causes are ruled out).

How to diagnose and fix it

  1. Connect a scan tool and verify P1835 is current; record freeze-frame data and check for other codes.
  2. Inspect the kick-down switch connector and wiring for corrosion, damage, or loose pins; repair as needed.
  3. Test the kick-down switch operation with a multimeter: check for continuity or voltage change when the pedal is pressed to the floor.
  4. Check switch adjustment per GM service information; adjust or replace the switch if it does not actuate correctly.
  5. Clear the code and perform a road test to see if it returns; if it does, backprobe the PCM connector to check signal voltage directly.
  6. If wiring and switch are good, substitute a known-good PCM only after confirming all other circuits are intact.

Kick-down switch faults often misdiagnosed

  • A sticking or misadjusted accelerator pedal can mimic a bad kick-down switch, so always verify pedal travel and switch actuation before replacing parts.
  • The kick-down switch circuit often shares a ground or reference voltage with other sensors; a fault elsewhere can set P1835 as a ghost code.
  • Intermittent P1835 codes frequently trace to chafed wiring near the pedal assembly where the harness flexes with pedal movement.
  • Some GM vehicles use a kick-down switch integrated into the accelerator pedal position sensor; a failing APP sensor can set P1835 without a separate switch.
  • Do not replace the PCM until you have load-tested the switch circuit and confirmed the signal at the PCM connector.

Can I keep driving with P1835?

The vehicle remains safe to drive because the kick-down function only affects passing power and the PCM defaults to normal shift patterns. Avoid full-throttle downshifts until repaired, and address the code promptly to prevent transmission wear from improper shift logic.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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