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Service bulletin IB-12-J-004-B

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 id10055255
Published by NHTSA2014-05-01
Manufacturer's numberIB-12-J-004-B
Manufacturer's date2014-02-01
NHTSA componentENGINE

NHTSA's summary

ISUZU: INFORMATION CONCERNING EXHAUSTS LEAKS, LOSS OF COOLANT OR OVER HEATING CONDITION AFTER A RECENT REPAIR TO ONE OR BOTH EGR COOLERS. APPPLIES TO 2007 - 2010 CHENVROLET OR GMC W3500/W4500/W5500, 2007 - 2015 ISUZU NPR/NPRHD/NQR/NRR, 2007 CHEVROLET OR GMC C6500/C7500/C8500, 2007 CHEVROLET OR GMC T6500/T7500/T8500, 2007 ISUZU FTR/FVR/FXR, AND 2007 ISUZU HTR/HVR/HXR. *JS

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 C SERIES2007
CHEVROLET T SERIES2007
CHEVROLET W-SERIES2007 to 2010
GMC C SERIES2007
GMC T SERIES2007
GMC W-SERIES2007 to 2010
ISUZU F-SERIES2007
ISUZU H-SERIES2007
ISUZU N-SERIES2007 to 2013

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

Other bulletins for the same vehicles and component
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03-00-91-001I2023-11-22. Service bulletin. This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing vibration concerns.
WB11-X-001A2023-11-06. Service bulletin. The following information is provided to clearly explain Isuzu’s policy for control module (engine, transmission, antilock brake, instrument panel, body control, power interface, etc.) reprogramming. Control module calibrations are regularly updated for many reasons. These reasons may include, but are not limited to: model year change, software corrections, certification compliance, product improvement and specific application requirements. However, the mere existence of a newer control module calibration does not necessarily mean that warranty coverage exists or that the calibration must be installed. It is not our policy to update control modules, under warranty or after warranty, based solely on the availability of a newer calibration file. Below are our guidelines for reprogramming control modules.
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