Engine Control Module (Ecm) - GMC Defense 2006 Owner's Manual Supplement

Engine Control Module (ECM)

When tires are changed from the original equipment
size to those adapted to off-road usage, the Engine
Control Module (ECM) must be reprogrammed to correct
the speedometer reading.
This reprogramming will also limit maximum vehicle
speed to 93 mph (150 km/h).
Engine
Model Year
2003/2004 LB7
LLY
2004
LLY
2005
2006 LBZ
Please refer to the light duty series GM BODY BUILDER BOOK for further general information regarding
* New calibrations include maximum vehicle speed of 93 mph (150 km/h)
Truck models K 2500: LLY, LB7 or LBZ 6.6L V8 Diesel
Engine and M74 or MW7 Automatic Transmission.
Reprogramming the ECM is done with a TECH II
electronic diagnostic system. Your GM dealer has this
equipment. Your dealer has the correct calibration
identified by the calibration part numbers on the
following chart and any later updates after this
publication.
Transmission New Tire Sizes
LT285/75R16 (628 Rev Mile)
M74
(392 Rev per Kilometer)
LT285/75R16 (628 Rev Mile)
M74
(392 Rev per Kilometer)
LT285/75R16 (628 Rev Mile)
M74
(392 Rev per Kilometer)
LT285/75R16 (628 Rev Mile)
MW7
(392 Rev per Kilometer)
vehicle modification.
*Calibration P/N
15130245
15130246
15130247
15130247
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