ECO mode reset - Battery Light Flashing

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Eco Mode and Citroen C3 Battery Light Flashing, not really a tip, but an explanation of the meaning:

The red battery light on the the dashboard flashes to warn the user that the car has entered 'economy mode'

Economy mode or 'Eco Mode' is activated by the car computer (BSI) to save the battery power when the ignition has been left on and the engine not yet started. To reset ECO mode and clear the flashing battery light, start the engine.

The usual faults with ECO mode won't reset are: 'Engine turns over, but won't start' or 'Car won't start'. The way to diagnose this is to ignore ECO mode resets and focus on starting the engine. Check the usual suspects, fuses, immobiliser chip, fuel pressure, starter motor etc..... Fix the engine and ECO mode will reset and the battery light will stop flashing.

Economy mode active on a Citroen C3 display
Economy mode active on a Citroen C3 display

Economy mode

In order not to run down the battery, when the engine is stopped, your vehicle passes automatically into economy mode after approx. 30 minutes of use of one or more electrical components.

Electrical components relating to comfort are automatically cut off.

To reactivate them, it is necessary to restart the engine.

Note: When changing to economy mode, the battery charge warning lamp starts to flash.
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The Citroen C3 'Battery Light' seen on the dashboard will flash when the car is in 'Eco Mode'
The Citroen C3 Battery Light will flash in eco mode
The Citroen C3 Battery Light will flash in eco mode
You may also get a warning on the display 'ECONOMY MODE ACTIVE'
ECONOMY MODE ACTIVE
ECONOMY MODE ACTIVE
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How long does eco mode last on Citroën C3?

Eco Mode will last until either the engine is started, the BSI goes into deep sleep or the car battery is flat. You don't want the battery going flat and eco mode tries to prevent this.

It is best to run the engine after a period of eco mode to get the car out of eco mode and bring some energy back to the battery.
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ECO mode has been unfairly blamed for cars not starting. That is just not the case.

If you own a "Sensodrive" or automatic (PRND) vehicle, failure to exit Eco Mode may mean there is a problem with the sensodrive system or automatic gear box.

If the snow flake and auto symbols are flashing (I.E. a gearbox problem) and the car goes into eco mode (I.E. playing the radio for too long or just trying to figure out what's wrong, with the ignition on) the car will go into eco mode but it will not come out of eco mode!

Some people complain that their car is "stuck" in eco mode (and wont start) when they actually have a gear box failure.

For the C3 to come out of eco mode the engine must start and run. Eco mode does NOT stop the car from starting! If there is an "autobox" problem, THAT will stop the engine from starting NOT the fact that it's in eco mode.

In this case, if it is necessary to get the system out of eco mode (say, to get the diagnostics working) it's possible for the starter relay to be by-passed and the engine can be started and the car will come out of eco mode. This WILL NOT fix the gearbox problem but it may "get you home" or help with the fault finding. The gearbox can only stop the starter from running, it does not stop the engine from running.

The same is true for a manual gearbox. If your battery is flat or in poor condition it may not have enough energy to engage the starter. If the ignition is left on for too long and the car gets into eco mode, it may appear that eco mode is preventing the car from starting...it won't. "Bump" starting, "jump" starting or just replacing the battery, will start the car and get it it out of eco mode!
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