Engine control unit malfunciton say's on - Sprinter Dodge Cars & Trucks

The method described by the other expert only gives the error code, long blinks = 10 short ones = 1
to actuall fix this and clear the error code will require the use of a scanner tool, eighter OBD1 or OBD2 depending on the vehicle. Its a bit expensive to actually buy one, then having to fix the error it dsplays then resetting it without causing further damage.
In my personal opinion Take this to a servcie center ,, you'll thank your self for it later.

Engine Control Unit Indicator Lamp

If the engine control unit indicator lamp remains on or lights up again while the vehicle is moving, the fuel tank was run empty or a fault has developed in the engine control unit. The engine's power output may be reduced. Refuel and bleed the fuel system or have the cause traced and rectified by an authorized Sprinter Dealer. Bleeding The Diesel Fuel System, The diesel fuel system must be bled before starting the engine.
Turn the key in the ignition lock position 2 for at least 30 seconds. Return the key to position 0.
Start the engine three to four times. The engine control unit indicator lamp must go out.

Hope that helps........

1. Put the key in the ignition.

2. Turn key all the way forward - not to the point where the car starts, just to the point where all the lights come on. Do it in this sequence: ON-OFF-ON-OFF-ON..

3. Keep a close eye on your odometer. You will see a series of codes display, followed by the word "donE"...

4. These codes will tell you why the "Check Engine Light" is coming on.

5. If you see "P0442" followed by "P0456". These codes mean respectively: EVAP sensor detection... SMALL LEAK. IF IT IS THESE SET OF CODES, fear not - nothing is wrong with your car. Simply tighten your gas cap, then...

6. Pop the hood, disconnect the NEGATIVE battery terminal - DO NOT DISCONNECT THE POSITIVE TERMINAL - FOR THE LOVE OF GOD. You will run the risk of shorting out the electrical system.

7. Wait a couple of minutes, then reconnect.

8. Start the car up and TADA! CEL is gone!

Hope this helps...