Mod DescriptionThree horizontal lines on the speedo LCD indicates that there is a fault in the gearshift system. There are a few reasons for this to happen.
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This page ONLY covers the fortwo 451 (late 2007 – present)
This is the symbol that will displayed on the speedo if a gear box/transmission problem occurs.
What Can Cause It?
First things first. Check all of the fuses.
The smart gearbox relies on a lot of electronics to keep it working properly, it only takes one part to misbehave to call up an error code. Causes can be one or more of the following:
Poor Earth Lead
Wet AMT Gearbox Controller
Car Dragged In Gear
After A Crash
Snapped Clutch Actuator Spiral Gear
Corroded Clutch Actuator Connections
Solder Joint Failure
Gear Change Motor Fault
Transmission Fluid Problem
What OBD Error Codes Could Be Shown?
More and more people have been buying generic code readers so here are the possible codes that you would see.
It seems it is possible for the battery to be too weak to move the gear motor fully. As the gears attempt to move and fail, the error code is bought up.
Get the battery tested and replace if it is faulty.