2006-2009 Range Rover Sport
Hard to believe a little, innocent looking, single filament or blown side / stop bulb in the rear light cluster could cause such havoc with gearbox and engine control modules, but this is a Land Rover, and since a lot of people here have been modifying their clusters with a variety of aftermarket lamps...:
Insert your sarcastic remarks about Land Rover's electronics here:Special Service Message (SSM) # 41116
LA - Discovery 3
LS - Range Rover Sport
Incorrect or blown stop/side light bulbs causing gearbox faults
Last Modified: 05-MAY-2009 12:13
Symptom: 201000 Lighting Systems
Issue: The customer reports engine or gearbox faults after replacement of the stop/side lamp bulbs or the bulb has blown.
Cause: The incorrect bulb has been fitted to the rear lamp stop/side holder. The customer may have fitted a single filament bulb which can be, if forced, inserted in place of a twin filament stop/side lamp bulb. This has been known to cause a number of more significant failures on the vehicle the main one being the gearbox goes into default mode.
Note: If the bulb has a broken stop/side lamp filament this can also give the same symptoms.
Action: To prevent any unnecessary and expensive repair please carry out a visual check of the brake and side lights before carrying out any further work to the engine and gearbox. The part number for the stop/side lamp bulb is XZQ000020