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3 Lines On The Speedo

Three 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.

Modification Details




This page ONLY covers the fortwo 450 (1998 - early 2007) & the Roadster

Information

This is the symbol that will displayed on the speedo if a shifting problem occurs.



Generally the car will not start and no gears can be selected although there
have been cases where the car has driven fine despite the error showing.

If the car drives fine forwards and backwards, simply disconnect the battery for
10 minutes before reconnecting. This should clear the error from the car's memory.

What Can Cause It?

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:

Faulty SE Drive
Stuck gears
Weak battery
Faulty brake lights
Incorrect Brake Light Bulb
Faulty rear light loom (Roadster)
Faulty gear motor
Faulty gear position sensor
Faulty clutch actuator
Chaffed wires
Stuck clutch
Seized gearbox
Faulty relay
Split reluctor rings
Worn Clutch Fork
Solder Joint Failure

This page goes into detail for each heading explaining how to fix each error.

Faulty SE Drive

The gear change works on non contact hall effect sensors that are activated by a magnet
(much like a reed switch but a chip format). Gear changes should be clean, smooth and full
push or pull to the limit of the stick's travel before releasing. Hesitation during a gear change
or not pushing/pulling the stick to the full limit can cause this error code to appear.

It is unlikely that the magnet will lose its power but there have been cases where the
internal PCB of the SE Drive falls down. This can put the hall effect sensors out of reach
of the magnet causing the same problem. Usually this problem can also cause the
ignition switch to move away from the barrel making the car impossible to start.
Info.

The PCB could become faulty, I don't know how exactly but electrical components in general do fail sometimes.

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