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Service bulletin 14652

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10089887
Published by NHTSA2017-01-30
Manufacturer's number14652
Manufacturer's date2015-07-07
NHTSA componentENGINE

NHTSA's summary

14652 - SPECIAL COVERAGE. ON SOME 2010-2012 MODEL YEAR CHEVROLET EXPRESS AND GMC SAVANA VEHICLES AND 2011-2012 MODEL YEAR CHEVROLET SILVERADO HD AND GMC SIERRA HD VEHICLES THAT ARE EQUIPPED WITH A 6.6L DIESEL ENGINE (LML/LGH), A MALFUNCTION-INDICATOR LIGHT (MIL) MAY ILLUMINATE DUE TO AN OFFSET IN THE TEMPERATURE SENSOR IN THE DIESEL-EMISSION-REDUCTION FLUID (DEF) TANK RESERVOIR, INCREASED TANK-HEATER RESISTANCE, OR REDUCTANT-SYSTEM PERFORMANCE. DEALERS ARE TO REPLACE THE DEF TANK RESERVOIR AND/OR SUPPLY MODULE PUMP.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
CHEVROLET EXPRESS2010, 2011, 2012
CHEVROLET SILVERADO 15002011, 2012 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 25002011, 2012 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 35002011, 2012 (the catalog's model; the bulletin names a series or trim of it)
GMC SAVANA 15002010, 2011, 2012 (the catalog's model; the bulletin names a series or trim of it)
GMC SAVANA 25002010, 2011, 2012 (the catalog's model; the bulletin names a series or trim of it)
GMC SAVANA 35002010, 2011, 2012 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 15002011, 2012 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002011, 2012 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 35002011, 2012 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

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