2013 Mack Pinnacle (cxu)

On April 28, 2020, the Office of Defects Investigation (ODI) opened PE20-005 to investigate reports of 2013-2015 Mack CHU and CXU trucks equipped with mDrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover MY 2013-2016 vehicles. The mDrive transmission is Mack's version of Volvo's I-Shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early I-Shift transmissions were recalled (13V-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although Mack's mDrive transmission adopted the latest Volvo I-Shift design and was built with the redundant clutch switch, ODI received field reports alleging that the mDrive transmission would not disengage when coming to a stop like the Volvo I-Shift transmissions in recall 13V-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, ODI was able to correlate two versions of transmission software (ID 23084009 and ID 23084004), with two frequently replaced parts ('solenoid valve' and 'cylinder assy clutch') as outliers. However, Mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to Mack, unlike the I-Shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, Mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the Mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled Volvo I-Shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, ODI concludes that the Mack vehicles do not present an unreasonable risk to motor vehicle safety. Although ODI is closing this PE, Mack/Volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by NHTSA that a safety-related defect does not exist. Claims are still being submitted and the Agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.

MACK/VOLVO MP8/D-13 INJECTORS: MACK TRUCKS EQUIPPED WITH THE MP8 ENGINES HAVE A KNOWN INJECTOR ISSUE THAT CAUSES THE TRUCK TO 1) MIS-FIRE AT ROAD SPEED CREATING A LOSS OF POWER. 2) INJECTOR FAILURE CAUSES EXCESSIVE SOOT CAUSING ON-ROAD FAILURES.3) THE TRUCK MAY NOT BE RESTARTED OR ABLE TO BE MOVED DUE TO EXCESSIVE CRANKING DUE TO INJECTOR FAILURE. 4) TRUCKS NEED TO BE TOWED TO A REPAIR FACILITY WHEN BREAKDOWN OCCURS. WE OWN MULTIPLE UNITS. THIS INJECTOR FAILURE ISSUE HAS BEEN DOCUMENTED ON MAJORITY OF TRUCKS. DOCUMENTS ARE AVAILABLE. PLEASE HAVE AN INVESTIGATOR CONTACT ME.

NHTSA ID

10898987

Incident

Aug 1, 2016

Mileage

1,000 mi

WE HAD AN ISSUE WITH THIS TRUCK AND THE M-DRIVE TRANSMISSION WHEN THE DRIVE WAS COMING OF A HIGHWAY ON AN EXIT RAMP HE WAS SLOWING DOWN AND THE VEHICLES CLUTCH STAYED ENGAGED AND THE DRIVER ROLLED INTO THE INTERSECTION ALMOST HITTING A CAR. THE VEHICLES CLUTCH IS AUTOMATICALLY DISENGAGES WHEN YOU PUSH ON THE BRAKE WHILE THE CLUTCH DIDN'T DISENGAGE BECAUSE WHEN OF THE BRAKE LIGHT WIRES HAD DEVELOPED A CORROSION SPOT FROM THE WINTER WEATHER AND SHORTED OUT THE LIGHT AND CAUSED THE FUSE TO BLOW. THE BRAKE LIGHTS ARE WHAT TELLS THE CLUTCH TO DISENGAGE BUT WITH THE FUSE BEING BLOWN THE CLUTCH DID NOT DISENGAGE AND KEPT ROLLING INTO INTERSECTION LUCKILY MY DRIVER WAS SMART ENOUGH TO REACH UP AND PUSH NEUTRAL BUTTON ON DASH TO PUT TRANSMISSION IN NEUTRAL AND STOP THE TRUCK. ALSO IN OUR INVESTIGATION WE FOUND WHEN THE FUSE BLOWS FOR THE BRAKE LIGHTS THE CRUISE CONTROL WILL NOT SHUT OFF BY TAPPING THE BRAKES YOU HAVE TO MANUALLY SHUT IT OFF BY THE SWITCH I HAVE NO PHOTOS AS NOTHING SERIOUSLY HAPPENED MY MECHANIC CHANGED THE FUSE ON THE ROAD AND FOUND THE CORRODED WIRE. MACK SHOULD HAVE A BETTER SOLUTION THAN USING BRAKE LIGHTS TO DISENGAGE THESE CONTROLS

NHTSA ID

10839430

Incident

Jan 8, 2016

Mileage

265,000 mi

CBR -Telematics Gateway (TGW) Connect Ability Issues

CBR - Automated Manual Transmission ( AMT ) Flywheel Pilot Bearing Wear On Input Shaft.

CBR - Active "Set Park Brake" Message On Drivers Information Display (DID).

CBR: TGW Will Not Connect After SIM Card Replacement

TSB: Mack Trucks now offer an improved HD Inter-Axle Through Shaft for the CRD 125, 150, 180, and 200 family carriers. The new HD shaft went into production on January 23rd, 2023 for 2.54 - 3.50 axle ratios and April 1st, 2023 for 3.56 - 3.98 ratios. The new HD through shaft is an upgrade over the current standard shaft and can now be used as a replacement part instead of the standard shaft. The new HD shaft has a new design to increase strength, longevity and life over the standard shaft.

CBR: Telematics Gateway ( TGW, MID 142 ) Losing Communication With The Instrument Cluster ( IC ) - Counts Of Fault Code (FC) MID 140 PSID 239 FMI 12 Data Link, MID 142 Faulty Device or Component Logging, Possibly Following Engine Start.