GM 84412929 DEF Tank Heater Reservoir for 2011 Silverado/Sierra LML Duramax

Description

Avoid limp mode and reduced engine power caused by a failed DEF tank heater with this updated OEM GM replacement.
The factory DEF tank heater on 2011 LML Duramax trucks is a known failure point — when it stops working, it triggers emissions faults and can disable full engine performance.

This updated GM 84412929 assembly restores proper DEF system operation and includes both the heater and level sensor pre-installed. It is a direct replacement for several older part numbers and is built to meet modern reliability standards.

Features & Benefits:
– Genuine GM part – factory-correct fit and function
– Updated design improves durability and long-term reliability
– Includes DEF tank heater & integrated level sensor
– Eliminates “limp mode” caused by DEF system failure
– Plug-and-play replacement for factory heater module

Fitment Applications:
2011 Chevrolet Silverado 2500HD / 3500HD (6.6L LML Duramax Diesel)
2011 GMC Sierra 2500HD / 3500HD (6.6L LML Duramax Diesel)
**Only fits 2011 model year LML Duramax. For 2012–2016 trucks, use GM part #84412924**

OEM Part Numbers:
GM #: 84412929
Replaces: 22783125, 22902619, 23379346

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