General Motors has issued two Customer Satisfaction Programs for certain model years of the Chevy LCF (Low Cab Forward) 6500 XD truck due to a problem with tires sizes and speed calibrations.
Select 2022 and 2023 Chevy LCF 6500 XD units may have a condition where the incorrect tire size – 255/70R22.5 to be exact – was installed on the vehicle. If this were to occur, then the medium-duty truck may not be calibrated properly, which could result in the speedometer displaying a speed that is faster than the actual vehicle speed while driving. In addition, the odometer will accumulate miles faster (roughly 14 percent) than the actual miles of the vehicle, while the mileage data collected and stored in the Mimamori unit (MMU) will be incorrect. Notably, this could lead to skewed notifications reminding the driver of service intervals, among other things.
To address this issue, certified GM technicians are to inspect affected vehicles and reprogram the Cummins Engine Control Module (ECM) with the correct tire size, as well as reprogram the MMU to correct the mileage accumulation. It should take GM techs roughly 1.5 hours to address the former problem, and another 30 minutes to address the latter.
It’s worth noting that the two CSP numbers are N232427130 and N232427140.
As a reminder, the Chevy LCF is a series of medium duty trucks developed from a partnership between General Motors and Isuzu Motors. Based off the Isuzu Forward, original engine options included a 5.2L I4 diesel engine producing 215 horsepower and 520 pound-feet of torque, while an Allison six-speed automatic transmission directed output to the ground.
Interestingly, a Cummins turbocharged 6.7L I6 diesel engine, rated at 260 horsepower and 660 pound-feet of torque, was introduced in 2022. An Allison automatic continues to serve as the sole transmission offering.
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