Reset Trip Computer After Software Update Of Ecu (54.50/247)

Publication date: 2011-09-09
Reference number: 54.50/247

RESET TRIP COMPUTER AFTER SOFTWARE UPDATE OF ECU

TECHNICAL SERVICE BULLETIN

Reference Number(s): S-B-54.50/247, Date of Issue: September 9, 2011

MERCEDES-BENZ:	Models All with Code 801 MY2011 and Code 802 MY2012
GROUP:	54 - Electrical system, equipment and instruments

SUBJECT

Models All with Code 801 MY2011 and Code 802 MY2012

Reset Trip Computer After Software Update of ECU

As of MY2011, trip data is no longer calculated in the instrument cluster. It is calculated in the engine control unit (ECU).

Therefore, any ECU software updates to any variant of gasoline or diesel passenger vehicle must include synchronization with the instrument cluster. If this is not done, the instrument cluster will show bars only and customer complaints will ensue.

After any ECU software updates, the trip computer must be reset (see menu items "After start" and "After reset") using the steering wheel buttons. This is necessary to ensure that travel data sent by the instrument cluster is synchronized with the ECU, and to ensure that consumption data (mpg) is correct.