ClaimRight · Warranty Denial Guides
Mack Granite (Gr) warranty claim denied?
365 manufacturer communications on file
4 warranty extensions / campaigns 2015–2025 model years covered
Having a warranty claim denied feels frustrating, especially when the repair involves a part the manufacturer has already flagged as problematic. For the Mack Granite (model years 2015–2025), NHTSA records show 365 manufacturer communications filed for this model, including 4 formal warranty extensions covering the Fuel Control Module, Pre-SCR NOx Sensor, and EGR Cooler. Separate service bulletins also describe issues such as clutch/flywheel housing oil leaks, rear main oil seal leaks on 13L engines, and timing gear plate concerns on Mack chassis.
A denial is not always the final word. Many dealer decisions are made quickly, without reviewing the full history of documented defects, extended coverage periods, or related service bulletins that may apply to your specific truck. When a denial is challenged with the right documentation, outcomes can change.
ClaimRight helps owners organize the manufacturer records relevant to their vehicle and understand what options may exist. A free assessment reviews your claim against the documented history for your model and explains next steps in plain language — no obligation, no guesswork.
What Mack has documented for the Granite (Gr)
Filed with NHTSA by the manufacturer. Warranty extensions are the strongest signal — the manufacturer acknowledging a defect and extending coverage for it.
2023-09-28 · U111 202309
Warranty extension Owner Notification Letter, Extended Warranty Coverage U111. The Fuel Control Module is the component provided coverage under this warranty extension.
Official NHTSA document →
2023-09-28 · U112 202309
Warranty extension Owner Notification Letter, Extended Warranty Coverage U112. The Pre-SCR NOx Sensor is the component provided coverage under this warranty extension.
Official NHTSA document →
2023-09-28 · U113 202309
Warranty extension Owner Notification Letter, Extended Warranty Coverage U113. The Pre-SCR NOx Sensor is the component provided coverage under this warranty extension.
Official NHTSA document →
2023-09-28 · U114 202309
Warranty extension Owner Notification Letter, Extended Warranty Coverage U114. The EGR Cooler is the component provided coverage under this warranty extension.
Official NHTSA document →
2024-11-14 · CBR-997 202411
Vehicles may present with oil leak coming from the clutch/flywheel housing and observation of burned clutch smell or clutch slipping. These symptoms can be mistaken as a crankshaft...
Official NHTSA document →
2024-11-06 · CBR-2417 202411
CBR - 11L Engine block compatibility and Backward Conversion Parts Requirements
Official NHTSA document →
2024-10-01 · M0296 202410
Emission Recall - Mack Trucks has determined that certain vehicles equipped with a model year (“MY”) 2022-2024 MP8 model engines, may be equipped with an improper engine software c...
Official NHTSA document →
2024-09-20 · CBR-570 202409
CBR: US17 GHG Common Rail Fuel System Component Electrical Faults - Model Year 2017 To 2024
Official NHTSA document →
2024-09-19 · CBR-2376 202409
CBR: Drivers Information Display (DID) Inoperative/Goes Blank During Vehicle Operation
Official NHTSA document →
2024-09-16 · CBR-731 202409
CBR: Automated Manual Transmission (AMT) Model D or F (mDrive and I-Shift, AMT-D, AMT-F) - Transmission Oil Leakage From Transmission Input Shaft Seal Or Output Shaft Seal - US10 A...
Official NHTSA document →
2024-09-13 · CBR-407 202409
CBR: To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP fi le will need to be downloaded.
Official NHTSA document →
2024-09-10 · CBR-471 202409
CBR: The procedure to eliminate the Mack Chassis "Air Restriction Light On" seen in the cluster is to confirm that the parameter YYT is set to "Enable" with Premium Tech Tool.
Official NHTSA document →
2024-08-29 · S0310 202408
Service Campaign: Mack trucks has determined that certain AN, GR, PI, TE, and LR model trucks built with TGW3 have stopped communicating after production.
Official NHTSA document →
2024-08-28 · CBR-343 202408
CBR: Mack chassis with an mDRIVE transmission, there have been reports of complete shift assemblies and TECUs being replaced due to technicians being unable to pinpoint the source...
Official NHTSA document →
2024-08-24 · S3284 202408
Service Campaign: Mack trucks has determined that certain AN, GR, and PI models were built using the incorrect power steering cooler hose clamps.
Official NHTSA document →
2024-08-13 · CBR-523 202408
CBR: Overhead Wear Overview - Model Year2018 To Current (Common Rail Fuel System ONLY)
Official NHTSA document →
Common questions
Can a denied Mack Granite warranty claim be reconsidered?
Yes, denials can sometimes be reconsidered, particularly when the repair relates to a component covered by a manufacturer warranty extension or addressed in a service bulletin. Reconsideration typically involves submitting documentation showing the issue matches a known, manufacturer-acknowledged defect. Each case depends on the specific repair, mileage, and coverage terms, so outcomes vary and should be reviewed individually.
What is a warranty extension and does it apply to my truck?
A warranty extension is a formal program where the manufacturer agrees to cover a specific component beyond the standard warranty period, usually because of a documented reliability issue. For the Mack Granite, extensions exist for parts like the Fuel Control Module, Pre-SCR NOx Sensor, and EGR Cooler. Whether one applies depends on your truck's model year, mileage, and repair history.
What should I do if my dealer denied a claim for a known issue?
Start by gathering repair orders, diagnostic reports, and any communication from the dealer explaining the denial reason. Compare these against publicly filed manufacturer bulletins or extensions related to the affected component. If the documentation suggests your issue matches a known defect, a formal review or appeal with supporting records may be appropriate before accepting the denial as final.
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