Mack Trucks, Inc.: Safety Recalls in 2021
Updated on March 19, 2026.
There were 9 safety recalls made by Mack Trucks, Inc. in 2021. See the details of the recalls below.
You can also see similar information for other manufacturers.
Data Source: NHTSA.
December 9, 2021
(Campaign #: SC0433)
Parking Brake May Release Unexpectedly
Mack Trucks, Inc. (Mack) is recalling certain 2008-2019 TerraPro (MRU) and 2019-2022 TerraPro (TE) vehicles. A brake control valve air leak into the attached exhaust hose can create excessive back pressure, causing the parking brake to release unexpectedly.
NHTSA ID: 21V953000
Component:
# of Units Affected: 20,668
Consequence Summary:
The unexpected release of the parking brake may allow the vehicle to rollaway, increasing the risk of a crash.
Corrective Action:
Dealers will remove the exhaust tube and fitting from the valve, free of charge. Owner notification letters were mailed February 8, 2022. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0433.
Park Outside Advisory: No
Do not Drive Advisory: No
Completion Rate (%): 61.22
November 3, 2021
(Campaign #: SC0432)
Broken Shaft Seal May Cause Loss of Power Steering
Mack Trucks, Inc. (Mack) is recalling certain 2021 Granite and LR vehicles. A machining defect may cause pressure to build in the power steering pump and break the shaft seal, resulting in a loss of power steering assist.
NHTSA ID: 21V856000
Component: STEERING
# of Units Affected: 79
Consequence Summary:
A loss of power steering assist increases the risk of a crash.
Corrective Action:
Dealers will replace the power steering pump, free of charge. Owner notification letters were mailed on December 10, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0432.
Park Outside Advisory: No
Do not Drive Advisory: No
Completion Rate (%): 69.62
September 1, 2021
(Campaign #: SC0429)
Brake Pedal Cotter Pin Not Installed Properly
Mack Trucks, Inc. (Mack) is recalling certain 2020-2022 Mack MD vehicles. The cotter pin that retains the brake pedal clevis pin may not have been properly installed, which could result in an unsecured brake pedal.
NHTSA ID: 21V684000
Component: SERVICE BRAKES, HYDRAULIC
# of Units Affected: 2,823
Consequence Summary:
An unsecured brake pedal can cause a loss of braking ability and increase the risk of a crash.
Corrective Action:
Owners are advised to not drive their vehicles until the remedy has been performed. Dealers will inspect the cotter pin installation and repair it as necessary, free of charge. Owner notification letters were mailed on September 13, 2021. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0429.
Park Outside Advisory: No
Do not Drive Advisory: Yes
Completion Rate (%): 98.19
July 27, 2021
(Campaign #: SC0428)
Loose Front Suspension Bolts
Mack Trucks, Inc. (Mack) is recalling certain 2022 Medium-Duty Trucks. The spring hanger brackets on the front suspension may have loose bolts.
NHTSA ID: 21V574000
Component: SUSPENSION
# of Units Affected: 60
Consequence Summary:
Loose suspension bolts can detach, possibly resulting in a loss of vehicle control and increasing the risk of a crash.
Corrective Action:
Dealers will tighten the spring hanger bracket bolts, free of charge. Owner notification letters were mailed on August 17, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0428.
Park Outside Advisory: No
Do not Drive Advisory: No
Completion Rate (%): 93.33
July 27, 2021
(Campaign #: SC0427)
Rear Axle Brakes May Fail
Mack Trucks, Inc. (Mack) is recalling certain 2021 Granite, LR, and TerraPro vehicles. The rear drive axle may have the incorrect type of brake cam installed, which could result in inoperative rear axle brakes.
NHTSA ID: 21V573000
Component:
# of Units Affected: 124
Consequence Summary:
Inoperative rear axle brakes can increase the distance required to stop, increasing the risk of a crash.
Corrective Action:
Dealers will inspect the brake cams, and incorrect brake cams will be replaced, along with brake shoes, hardware, and wheel seals, as necessary, free of charge. Owner notification letters were mailed on August 10, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0427.
Park Outside Advisory: No
Do not Drive Advisory: No
Completion Rate (%): 69.35
June 25, 2021
(Campaign #: SC0426)
Lower Rear Pivot Cap Screws may be too Short
Mack Trucks, Inc. (Mack Trucks) is recalling certain 2020-2021 Granite vehicles equipped with certain SL2065 steerable lift axles. The lower rear pivot cap screws may not be long enough to sufficiently engage the locking feature of the corresponding nuts.
NHTSA ID: 21V476000
Component: SUSPENSION
# of Units Affected: 8
Consequence Summary:
The short screws can cause the hardware to separate from the suspension system and become a road hazard, increasing the risk of a crash or injury.
Corrective Action:
Mack Trucks will inspect the suspension system and replace the lower rear pivot cap screws, as necessary, free of charge. Owner notification letters were mailed on July 30, 2021. Owners may contact Mack Trucks' customer service at 1-800-866-1177. Mack Trucks' number for this recall is SC0426.
Park Outside Advisory: No
Do not Drive Advisory: No
Completion Rate (%): 100
June 2, 2021
(Campaign #: SC 0425)
Hubcap can Separate and Become Road Hazard
Mack Trucks, Inc. (Mack) is recalling certain 2021-2022 Anthem, Granite, and Pinnacle vehicles. The hubcap compression spring can cause the hubcap to separate.
NHTSA ID: 21V416000
Component:
# of Units Affected: 307
Consequence Summary:
A separated hubcap can create a road hazard, increasing the risk of a crash.
Corrective Action:
Dealers will remove the hubcap, free of charge. Owner notification letters were mailed June 30, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0425.
Park Outside Advisory: No
Do not Drive Advisory: No
Completion Rate (%): 71.99
April 26, 2021
(Campaign #: SC0424)
Insufficient Lubrication in Steering Transfer Case
Mack Trucks, Inc. (Mack) is recalling certain 2019-2020 LR vehicles. The steering transfer case may have an insufficient amount of oil.
NHTSA ID: 21V293000
Component:
# of Units Affected: 272
Consequence Summary:
The internal bearings may fail without sufficient lubrication, causing steering lock-up and increasing the risk of a crash.
Corrective Action:
Dealers will replace the transfer case, free of charge. Owner notifications letters were mailed on May 12, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0424.
Park Outside Advisory: No
Do not Drive Advisory: No
Completion Rate (%): 79.41
April 1, 2021
(Campaign #: SC0423)
Vehicle May Not Stay In Lane/FMVSS 136
Mack Trucks, Inc. (Mack) is recalling certain 2018-2022 Anthem (AN), Granite (GR/GU), and Pinnacle (CHU/CXU/PI) vehicles equipped with "camelback" rear suspension and electronic stability control. The vehicles may not stay in their lane at certain speeds. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 136, "Electronic Stability Control Systems on Heavy Vehicles."
NHTSA ID: 21V233000
Component: ELECTRONIC STABILITY CONTROL (ESC)
# of Units Affected: 557
Consequence Summary:
A vehicle that drifts out of its lane increases the risk of a crash.
Corrective Action:
Mack will notify owners, and dealers will reprogram the vehicle control units, free of charge. The recall began on April 21, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0423.
Park Outside Advisory: No
Do not Drive Advisory: No
Completion Rate (%): 75.04
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