5-15
Engine Control Module (ECM)
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.
* New calibrations include maximum vehicle speed of 93 mph (150 km/h)
Model Year
Engine
Transmission
New Tire Sizes
*Calibration P/N
2003/2004
2004
LB7
M74
LT285/75R16 (628 Rev Mile)
(392 Rev per Kilometer)
LLY
M74
15130245
15130246
Please refer to the light duty series GM BODY BUILDER BOOK for further general information regarding
vehicle modification.
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).
2005
M74
LLY
15130247
LT285/75R16 (628 Rev Mile)
(392 Rev per Kilometer)
LT285/75R16 (628 Rev Mile)
(392 Rev per Kilometer)
2006
LT285/75R16 (628 Rev Mile)
(392 Rev per Kilometer)
MW7
LBZ
15130247
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