# Service bulletin KC\-253

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.

- Type: Service bulletin
- NHTSA id: 10206141
- Published by NHTSA: 2022\-01\-06
- Manufacturer's number: KC\-253
- Manufacturer's date: 2021\-12\-15
- NHTSA component: ENGINE AND ENGINE COOLING; FUEL SYSTEM, OTHER:FUEL INJECTION SYSTEM

## NHTSA's summary

Mack Chassis \- FSB 237 \- 020, Unit Injector Yoke Hold \- Down Bolt Torque Specification

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10206141-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10206141-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Fuel system

## Vehicles listed

- 2009 to 2017 MACK CHU
- 2010 MACK CHU613
- 2010 MACK CHU614
- 2009 to 2017 MACK CXU
- 2010 to 2011 MACK CXU612
- 2010 MACK CXU613
- 2010 MACK CXU613E
- 2010 MACK CXU614
- 2016 MACK GRANITE \(GR\)
- 2017 MACK GRANITE \(GR\)
- 2009 to 2016 MACK GRANITE \(GU\)
- 2017 MACK GRANITE \(GU\)
- 2009 to 2016 MACK PINNACLE \(CHU\)
- 2017 MACK PINNACLE \(CHU\)
- 2009 to 2016 MACK PINNACLE \(CXU\)
- 2017 MACK PINNACLE \(CXU\)

## Other bulletins for the same vehicles and component

- [M0302 022026](/bulletins/11029451.md), 2026-03-03, Emissions: ENGINE. Emissions \- Mack Trucks has determined that certain vehicles equipped with a model year \(“MY”\) 2017\-2018 MP7 engine may not meet California and Federal Regulations \(CARB\).
- [CBR 820\-9 202601](/bulletins/11028051.md), 2026-02-03, Service bulletin: ENGINE; VEHICLE SPEED CONTROL. CBR \- Mack Chassis \- Engine Brake Only Works With The Brake Pedal, No Function During Cruise. US07 And Newer Emissions, Model Year 2008 And Newer.
- [CBR 2107\-22 202601](/bulletins/11028032.md), 2026-02-02, Service bulletin: ENGINE. CBR \- Mack DEF Level \(UQLS\) Sensor Troubleshooting Guide \- US17\+OBD16 Emissions to US22\+OBD2023 \(DOES NOT APPLY TO AN\(4\) and PR\(4\)\).
- [CBR 2171\-11 202511](/bulletins/11026025.md), 2025-12-03, Service bulletin: ENGINE; ELECTRICAL SYSTEM. CBR \- Mack Temperature Sensor Troubleshooting Guide
- [CBR 2107\-21 202505](/bulletins/11018813.md), 2025-06-02, Service bulletin: FUEL/PROPULSION SYSTEM; ENGINE. Mack DEF Level \(UQLS\) Sensor Troubleshooting Guide \- US17\+OBD16 Emissions and Newer
- [CBR 445\- 11 202505](/bulletins/11018806.md), 2025-06-02, Service bulletin: FUEL/PROPULSION SYSTEM. Vehicles Equipped With a Common Rail Fuel System \- Aftermarket Secondary Fuel Filters, Important Information On Approved Filters \- US17\+OBD16 toUS21\+OBD23
- [CBR 170\-8 202505](/bulletins/11018804.md), 2025-06-02, Service bulletin: ENGINE. Inactive Code P25AE00 Being Generated After A Hard Pull And A Momentary Drop In Engine Oil Pressure \(Low Oil Pressure\) \(Possible Related Codes \- SPN4811 , SPN 100 , PID 100\)
- [M0350 202504](/bulletins/11017732.md), 2025-05-05, Emissions: ENGINE. ER \- Mack Trucks has identified that the Selective Catalyst Reduction \(SCR\) system in certain vehicles equipped with the MY 2017 or 2018 MP8 VGT and Turbo Compound \(TC\) engines are not meeting California and EPA emissions standards, or Mack cannot confirm its compliance.
- [CBR\-561 202503](/bulletins/11016342.md), 2025-04-02, Service bulletin: ENGINE. If oil dilution is suspected refer to the applicable CBR solution below: ∙ CBR\-659􀁡Mack Chassis \- Oil Diluted With Fuel; Fuel In Oil, Diagnostic Information \- All Emissions, All Model Years
- [CBR\-997 202411](/bulletins/11010857.md), 2024-12-02, Service bulletin: ENGINE. 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 rear main seal leak, when the actual cause is the crankshaft adaptor O\-ring.

JSON: [/v1/bulletins/10206141](/v1/bulletins/10206141)

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