Dull thumping noise or ticking noise under the vehicle in the area of the engine/two-mass...

Bulletin number

LI01.00-P-078172

Component

Engine

Summary

Complaint Dull thumping noise or ticking noise under the vehicle in the area of the engine/two-mass flywheel/transmission. Is significantly perceptible at the front right wheel well and can also be faintly heard in the vehicle interior. Cause The ticking noise occurs in idle operation in drive program C & S at 780 rpm when the state of charge of the battery is over 65% and the load requirement at the belt-driven starter alternator is simultaneously over 25 Nm. The load requirement can occur due to a number of auxiliary consumers (e.g. air conditioning system, steering wheel or seat heating, etc.). Remedy Check the software version on N127 (PTCU) and N15/15 (transmission) and update if an update is available. Software change: Adaptation of the idle speed and thereby reduction of the intensity of the noise. If the problem persists, the cause is design-related and therefore corresponds to the series production configuration. Replacing parts does not remedy the problem. Note: The noise is not caused by damage or a defect. It also has no negative effects over the operating time.

Owners of these vehicles have filed 3 complaints in the engine category.