Faulty or worn accelerator pedal module or kick-down switch, giving a wrong or intermittent signal; Damaged wiring, corroded or loose connectors between the pedal, engine control unit and gearbox control unit; Related accelerator pedal position or throttle fault stored in the engine control unit that corrupts the kick-down message; Data bus communication fault between the engine and gearbox control units; Outdated control unit software or a known calibration issue for the specific model and engine; Faulty gearbox control unit or engine control unit.

P1860

Kick Down Switch Error Message From Engine Control.

Volkswagen
Powertrain
Manufacturer code
Medium severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
8: AreaTransmission
60: FaultThe specific fault in that area

What it means

On Volkswagen models, P1860 means the automatic gearbox control unit has received a fault message about the kick-down switch signal from the engine control unit. The kick-down signal tells the gearbox when the driver has pressed the accelerator fully for maximum acceleration. The gearbox control unit saw an implausible, missing or conflicting kick-down signal, so it logged the fault. How the signal is carried (hardwired switch, accelerator pedal sensor or data bus) depends on the model and year.

Symptoms

Gearbox warning light or fault lamp on the dashboard
No kick-down downshift when the accelerator is pressed fully
Kick-down happening unexpectedly or at the wrong pedal position
Gearbox defaulting to a limited or emergency programme
Hesitant, late or harsh gear changes under heavy throttle
Engine management light on in some cases

Possible causes

Faulty or worn accelerator pedal module or kick-down switch, giving a wrong or intermittent signallikely
Damaged wiring, corroded or loose connectors between the pedal, engine control unit and gearbox control unitlikely
Related accelerator pedal position or throttle fault stored in the engine control unit that corrupts the kick-down messagepossible
Data bus communication fault between the engine and gearbox control unitspossible
Outdated control unit software or a known calibration issue for the specific model and enginepossible
Faulty gearbox control unit or engine control unitrare

How to diagnose

Read all fault codes from the engine and gearbox control units and record freeze frame data and any pedal or throttle codes
Check live data for accelerator pedal position and the kick-down status, and confirm it changes cleanly at full pedal travel
Inspect the pedal module, its connector and the surrounding wiring for damage, moisture, corrosion or loose pins
Check the battery condition and charging voltage, as low voltage can cause false signals and communication faults
Check wiring continuity and for shorts between the pedal, engine control unit and gearbox control unit, following the wiring diagram for the model
Check for data bus faults or other communication codes that point to a network problem
Check for available software updates or technical bulletins for the model and engine
Clear the code and road test to see whether it returns, noting when it sets

How to fix

Replace the accelerator pedal module or kick-down switch if it gives a faulty signal
Repair or replace damaged wiring and clean or replace corroded connectors
Fix any related pedal, throttle or engine control faults first, then recheck the kick-down signal
Repair the data bus fault found during testing
Update the control unit software if an outdated calibration is a known cause for that model
Replace the faulty control unit only after all wiring and input checks pass, then code and adapt it as required

Can I keep driving?

Medium severity

The car can usually be driven gently for a short time, but the gearbox may run in a limited mode with poor kick-down. Get it checked soon, as a fault with the pedal signal could affect throttle response when overtaking.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.