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Trucks Dealer Bulletin
To:
General Managers, Service Managers, Service Technicians, Warranty Managers
From:
Volvo Trucks – Service
Date:
January 12, 2022
Subject:
TC Engine Turbochargers
Bulletin:
SNV22-001
Volvo Trucks is receiving a high number of No Fault Found (NFF) warranty claims for Turbo Compound (TC)
engine turbochargers. From an extensive investigation of turbochargers returned to TMAC and data collected
from the service event, it has been determined that hot side noise complaints on TC engines leading to
replacement of the turbocharger are being mis-diagnosed. To aid in the diagnosis of TC engine hot side noise
complaints CBR 2013 has been released and should be followed.
Explanation:
The noise signature of the TC engines is different from other engines. The TC-Turbocharger rotor design
differs from other turbos, which means the noise the turbocharger emits will differ. Hence drivers and
technicians may hear noises that are not typical for a none TC engine. These noises are not commonly failure
of the turbocharger but rather this engine’s noise signature.
Resolution:
Effective with RO’s opened February 1st, 2022 and after. Follow CBR 2013 and do not replace turbochargers
for a noise complaint only. Turbochargers replaced for noise complaints on TC engines, will be triggered for
return to TMAC and may be denied based on the failure analysis
© 2022 Volvo Group North America, LLC. CONFIDENTIAL - For limited distribution only to circulation list above. This bulletin, and any information herein,
is subject to change by Company without notice. For the most current and accurate information, always refer to Trucks Dealer Portal for the electronic
version of this document.