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LIFETIME CONTRIBUTOR
2006-2009 Range Rover Sport
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11,013 Posts
Discussion Starter #1
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...:

Special Service Message (SSM) # 41116

Models:
LA - Discovery 3
LS - Range Rover Sport

Incorrect or blown stop/side light bulbs causing gearbox faults
Last Modified: 05-MAY-2009 12:13
Category: Electrical
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
Insert your sarcastic remarks about Land Rover's electronics here:
 

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SUPER MODERATOR
2006-2009 Range Rover Sport
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4,459 Posts
Side lamp bulbs, as in the blinkers on the driver and passenger's front door or the blinkers on the rear and front headlights?
 

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2006-2009 Range Rover Sport
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165 Posts
I know this is a massive bump but I've just had this. No faults thrown, well ones on dash or ones that show up on a crappy obd tool. but the car now wont shift itself, i need to manually do it. last thing i did was stick in a random light bulb from a petrol station for rear brake light. ive ordered the correct set, am hoping thatll just sort it.
 

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2006-2009 Range Rover Sport
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165 Posts
Cant seem to edit my original post, but new bulb fixed my issue. turns out it also broke the cruise control which is now back to working fine
 

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2006 Range Rover Sport 2016 Mercedes S550 4MATIC
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123 Posts
Is there anything else worse than this in the car?
 

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2006-2009 Range Rover Sport
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61 Posts
lol classic British electronics - part of the charm of owning one of these things
 
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