Kenworth T660 — Steering
High risk
Apr 25, 2022
Model years: 2018, 2019, 2020
On certain trucks, the fasteners that attach the steer arm to the steering knuckle may fail. If this happens, the steer arm could separate from the steering knuckle and cause a los
Also affects: Kenworth T270, Kenworth T370, Kenworth T440, Kenworth T470, Kenworth T680
Kenworth T660 — Lights And Instruments
High risk
Apr 7, 2020
Model years: 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020
On certain trucks, the warning light for the tractor anti-lock brake system (ABS) may not turn on if the system loses power. If this happens, the driver will not get warning that t
Also affects: Kenworth T170, Kenworth T270, Kenworth T370, Kenworth T680, Kenworth T800
Kenworth T660 — Powertrain
High risk
Dec 24, 2018
Model years: 2018, 2019
On certain vehicles equipped with an Eaton automated manual transmission and electronic clutch actuator (ECA), the clutch may have been manufactured improperly and could fail. If t
Also affects: Kenworth C500, Kenworth T270, Kenworth T370, Kenworth T440, Kenworth T800
Kenworth T660 — Fuel System
High risk
Sep 25, 2018
Model years: 2017, 2018, 2019
On certain trucks built with a Cummins X15 or ISX15 engine equipped with nylon fuel lines and a banjo bolt on the fuel pump, a blockage in the fuel cooling system may cause a fuel
Also affects: Peterbilt 579, Kenworth T680, Peterbilt 587, Peterbilt 389, Peterbilt 386
Kenworth T660 — Electrical
High risk
Aug 23, 2018
Model years: 2016, 2017, 2018, 2019
On certain trucks with an ISX15 engine and a 1.9 M cab, the engine wiring harness is missing circuits to allow the illumination of Check (CEL) and Stop (SEL) Engine Lamps and sound
Also affects: Kenworth W900, Kenworth T800, Kenworth C500
Kenworth T660 — Brakes
High risk
Jul 24, 2018
Model years: 2015, 2016, 2017, 2018
Certain vehicles may fail to conform to the requirements of Canada Motor Vehicle Safety Standard (CMVSS) 121 - Air Brake Systems and CMVSS 136 - Electronic Stability Control System
Also affects: Kenworth T800, Kenworth T880, Kenworth W900, Peterbilt 365, Peterbilt 367
Kenworth T660 — Steering
High risk
Sep 25, 2017
Model years: 2016
On certain vehicles, the castellated nut and cotter pin on the steer axle may not have been tightened to specification. This could cause the tie rod to become loose in the steer ax
Also affects: Kenworth T170, Kenworth T270, Kenworth T370, Kenworth T440, Kenworth T680
Kenworth T660 — Engine
High risk
Jun 8, 2016
Model years: 2017
On certain vehicles, the Engine Control Module (ECM) may develop an internal electrical short circuit that could blow a fuse in the ECM's electrical supply circuit. This could caus
Also affects: Kenworth C500, Kenworth T680, Kenworth T800, Kenworth T880, Kenworth W900
Kenworth T660 — Engine
High risk
Sep 23, 2015
Model years: 2016
On certain vehicles equipped with a Cummins engine, the Engine Control Module (ECM) could develop an internal electrical short circuit that could blow a fuse in the ECM’s electrica
Also affects: Peterbilt 587, Peterbilt 382, Kenworth T680, Peterbilt 579, Peterbilt 567
Kenworth T660 — Brakes
High risk
Jul 20, 2015
Model years: 2016
Certain vehicles fail to comply with the requirements of Canada Motor Vehicle Safety Standard 121 - Air Brake Systems. The two service brake connections of the SR-7 spring brake va
Also affects: Kenworth T800, Kenworth W900, Kenworth T880, Kenworth T470, Kenworth T680
Kenworth T660 — Lights And Instruments
High risk
Jul 20, 2015
Model years: 2011, 2012, 2013, 2014, 2015, 2016
Certain vehicles equipped with HID headlamps may not comply with the requirements of Canada Motor Vehicle Safety Standard 108 - Lighting System and Retroreflective Devices. A Dayti
Also affects: Kenworth T880, Kenworth T470, Kenworth T440, Kenworth T680
Kenworth T660 — Electrical
High risk
May 8, 2015
Model years: 2014, 2015, 2016
On certain vehicles equipped with PACCAR MX-13 engines and Delco-Remy 40SI alternators, the alternator charge cable may chafe against an air conditioning discharge line. This chafi
Also affects: Peterbilt 567, Peterbilt 386, Peterbilt 579, Peterbilt 587, Peterbilt 389
Kenworth T660 — Electrical
High risk
May 8, 2015
Model years: 2011, 2012, 2013, 2014, 2015, 2016
On certain vehicles, water could migrate into wiper motor head and could lead to internal corrosion. This internal corrosion could form a conductive salt bridge which could result
Also affects: Kenworth 963, Kenworth C500, Kenworth C540, Kenworth C550, Kenworth T270
Kenworth T660 — Wheels
High risk
May 8, 2015
Model years: 2016
On certain vehicles, the wheel nuts may have been insufficiently tightened during vehicle assembly. This could cause the wheel nuts to loosen and could lead to a complete separatio
Also affects: Kenworth T800, Kenworth T680, Kenworth T880, Kenworth W900
Kenworth T660 — Brakes
High risk
Jan 28, 2015
Model years: 2014
On certain vehicles equipped with a Wabco quick release with double check valves, used to control park/spring brake application, the valve may leak internally. This could cause uni
Also affects: Peterbilt 210, Kenworth T880, Peterbilt 320, Kenworth T800, Kenworth K370
Kenworth T660 — Brakes
High risk
Dec 23, 2014
Model years: 2015
On certain vehicles, brake chamber diaphragm(s) may not be properly seated. This could lead to brake drag, causing brake overheating or unintended spring brake application. These i
Also affects: Kenworth T270, Kenworth T370, Kenworth T440, Kenworth T470, Kenworth T680
Kenworth T660 — Electrical
High risk
Nov 7, 2014
Model years: 2015
On certain vehicles, an undersized wire in the trailer stop lamp circuit of the instrument panel harness is susceptible to thermal cycling which may cause damage to the wiring. Thi
Also affects: Kenworth C500, Kenworth T400, Kenworth T800, Kenworth W900
Kenworth T660 — Engine
High risk
Feb 19, 2014
Model years: 2014, 2015
On certain vehicles equipped with Cummins ISL G or ISX12 G engines, incorrect engine ECU programming could cause the exhaust system temperature to become elevated during cold weath
Also affects: Kenworth T440, Kenworth T800, Kenworth W900, Peterbilt 320, Peterbilt 365
Kenworth T660 — Seats And Restraints
High risk
Jan 24, 2014
Model years: 2014
On certain vehicles, the seat belts may not comply with Canada Motor Vehicle Safety Standard 209 - Seat Belt Assemblies. Due to a defect in manufacturing, the seat belt buckle may
Also affects: Kenworth C500, Kenworth C550, Kenworth T170, Kenworth T270, Kenworth T370
Kenworth T660 — Lights And Instruments
High risk
Dec 5, 2013
Model years: 2014
The stop/turn/tail lights used on certain vehicles may not comply with the requirements of Canada Motor Vehicle Safety Standard (CMVSS) 108 - Lighting System and Retroreflective De
Also affects: Kenworth T170, Kenworth T270, Kenworth T370, Kenworth T440, Kenworth T470
Kenworth T660 — Electrical
High risk
May 24, 2013
Model years: 2014
On certain trucks, an internal defect in the ignition switch can cause the starter to engage when the key is partially inserted. This would allow the engine to start unexpectedly,
Also affects: Kenworth T170, Kenworth T270, Kenworth T370, Kenworth T470, Kenworth T680
Kenworth T660 — Suspension
High risk
Jan 31, 2013
Model years: 2013
On certain trucks equipped with an air suspension dump valve option, a software error could cause the rear suspension to reinflate without warning when the operator turns the key t
Also affects: Peterbilt 579, Peterbilt 567
Kenworth T660 — Brakes
High risk
Jan 27, 2012
Model years: 2012, 2013
On certain trucks equipped with Bendix ATR-6 Antilock Traction Relay valves, in extremely cold conditions (at or below -18 degrees Celsius), internal ATR valve leakage can occur. T
Also affects: Kenworth T170, Kenworth T270, Kenworth T370, Kenworth T440, Kenworth T470
Kenworth T660 — Powertrain
High risk
Jul 21, 2011
Model years: 2011, 2012
On certain trucks equipped with a PACCAR MX engine and Eaton Ultrashift DM or Allison automatic transmission (without auto-neutral), the Fast Idle Control (also known as high idle)
Also affects: Kenworth T700, Kenworth T800, Peterbilt 365, Peterbilt 367, Peterbilt 384
Kenworth T660 — Other
High risk
Jun 21, 2011
Model years: 2012
On certain trucks, the hood strut assembly may have been incorrectly manufactured and could fail. This could prevent the safety latch (designed to keep the hood open during servici
Kenworth T660 — Engine
High risk
Mar 24, 2011
Model years: 2007, 2008, 2009, 2010, 2011
On certain trucks equipped with a Caterpillar C15 diesel engine, the Diesel Particulate Filter (DPF) combustion tube may fail. This could result in a vehicle fire causing property
Also affects: Kenworth T600, Kenworth T2000, Kenworth T800, Kenworth W900, Kenworth C500
Kenworth T660 — Brakes
High risk
Mar 7, 2011
Model years: 2011, 2012
On certain vehicles, the slack adjuster housings may have been manufactured incorrectly, which could allow the housings to fracture and fail. As a result, the wheel brake to which
Also affects: Kenworth T370, Kenworth T470, Kenworth T440, Kenworth T270, Kenworth T800
Kenworth T660 — Engine
High risk
Feb 25, 2011
Model years: 2007, 2008, 2009, 2010, 2011, 2012
On certain vehicles equipped with a PACCAR MX engine, the oil module centrifugal spinner filter cap may become loose, possibly allowing the cap to come off and engine oil to partia
Also affects: Peterbilt 365, Peterbilt 388, Kenworth T700, Peterbilt 587, Kenworth T800
Kenworth T660 — Other
High risk
Jan 11, 2011
Model years: 2011
On certain vehicles, the safety latch (designed to keep the hood open during servicing) may fail allowing the hood to close unexpectedly, which could cause injury to someone workin
Also affects: Kenworth T700
Kenworth T660 — Powertrain
High risk
Dec 13, 2010
Model years: 2007, 2008
On certain vehicles, the bearing surfaces of the extended lube universal joint that attaches the inter-axle driveline to the drive axle may become prematurely worn due to breakdown
Also affects: Kenworth T800, Peterbilt 386, Peterbilt 388, Peterbilt 385, Peterbilt 387
Kenworth T660 — Brakes
High risk
Oct 28, 2010
Model years: 2009, 2010, 2011
On certain vehicles equipped with the AG400L suspension and air disc brakes, a caliper could be installed on the wrong side of the drive axle. This could cause interference with th
Also affects: Kenworth T700, Kenworth T800, Kenworth W900
Kenworth T660 — Engine
High risk
Oct 4, 2010
Model years: 2011
On certain vehicles, the exhaust gas recirculation (EGR) oil seal installed on the output shaft of the valve actuator may delaminate, possibly allowing engine oil to leak from the
Also affects: Kenworth T800, Peterbilt 587, Kenworth T700, Peterbilt 384, Kenworth W900
Kenworth T660 — Electrical
High risk
Sep 29, 2010
Model years: 2011
On certain vehicles, one of the harness spade terminal connections to the chassis load center may become completely unseated. An unseated connection may result in a power loss to a
Also affects: Kenworth T800, Kenworth C500, Kenworth T470, Kenworth T440, Kenworth W900
Kenworth T660 — Steering
High risk
Jun 30, 2010
Model years: 2008, 2009, 2010
On certain trucks, the weld around the steering shaft tube, which joins the splined tube to the non-splined intermediate tube, may be mislocated. An improperly located weld bead ma
Also affects: Kenworth C500, Kenworth T2000, Kenworth T800, Kenworth W900, Peterbilt 365
Kenworth T660 — Other
High risk
Jun 10, 2010
Model years: 2009, 2010
On certain trucks, the retaining pins securing the hood strut tube to the hood strut assembly may become loose and fall out, allowing the lock tube to rotate on the strut assembly.
Kenworth T660 — Suspension
High risk
Apr 30, 2010
Model years: 2010
On certain vehicles, the rear axle outer end hub may have not been primed with oil properly during the rear axle installation process. Potential lack of oil may cause the outer end
Also affects: Kenworth T2000, Kenworth T800, Kenworth W900
Kenworth T660 — Steering
High risk
Dec 30, 2009
Model years: 2010
On certain vehicles, the fasteners attaching the steering gear to the front drive bracket may have received insufficient torque at assembly, resulting in less than the required cla
Also affects: Kenworth W900s, Kenworth T2000, Kenworth T800
Kenworth T660 — Brakes
High risk
Oct 29, 2009
Model years: 2004, 2005, 2006, 2007, 2008, 2009
Certain vehicles may suffer cracking of various brake assembly components (i.e. brake cam tube mounting flanges, brake air chamber bracket, brake air chamber, brake spider). Over t
Also affects: Kenworth W900, Kenworth T600, Kenworth T800, Kenworth T2000
Kenworth T660 — Suspension
High risk
Oct 22, 2009
Model years: 2009, 2010
On certain trucks, the rear axle u-bolts may have received insufficient tightening torque during vehicle assembly. This could allow the u-bolts to loosen over time, which may cause
Also affects: Kenworth T800, Kenworth T2000, Kenworth W900
Kenworth T660 — Steering
High risk
Jul 13, 2009
Model years: 2009
On certain vehicles, an incorrect weld on the steering shaft tube assembly may allow the splined tube and the non-splined tube to rotate relative to one another during a low speed,
Also affects: Kenworth T2000, Kenworth T800, Kenworth W900, Peterbilt 365, Peterbilt 367
Kenworth T660 — Brakes
High risk
May 20, 2009
Model years: 2005, 2007, 2008, 2009
On certain vehicles, the caliper mounting fasteners attaching the air disc brake caliper assembly to the torque plate may have received insufficient tightening torque during the as
Also affects: Kenworth T800, Kenworth W900
Kenworth T660 — Suspension
High risk
Oct 1, 2008
Model years: 2004, 2005, 2006, 2007, 2008, 2009
Certain vehicle configuration which includes an AG400 rear suspension, long stroke brake chambers, and wide base tires may develop an increase in lateral and vertical axle movement
Also affects: Kenworth Tc2000, Kenworth W900, Kenworth T800, Kenworth T600
Kenworth T660 — Other
High risk
Sep 24, 2008
Model years: 2006, 2007, 2008, 2009
On certain trucks, the inadequate stiffness of the Diesel Particulate Filter (DPF) bracket could result in the separation of the DPF from the chassis, which could result in persona
Also affects: Kenworth T2000, Kenworth T600, Kenworth T800, Kenworth W900, Peterbilt 365
Kenworth T660 — Suspension
High risk
Jul 11, 2008
Model years: 2009
On certain trucks, the rear axle u-bolts may have received insufficient tightening torque during vehicle assembly. This could allow the u-bolts to loosen over time, which may cause
Also affects: Kenworth T2000, Kenworth T600, Kenworth T800, Kenworth W900
Kenworth T660 — Electrical
High risk
Jun 26, 2008
Model years: 2009
On certain trucks, a 90-degree standoff mounted on the front bumper support may interfere with proper hood strut operation. As a result of contact when the hood is opened, the stru
Kenworth T660 — Brakes
High risk
Mar 19, 2008
Model years: 2008, 2009
Certain vehicles may have been assembled with an incorrectly manufactured Bendix MV-3 dash control valve. If the double check valve becomes lodged, in the event of a primary reserv
Also affects: Kenworth C500, Kenworth T2000, Kenworth T800, Kenworth W900, Peterbilt 367
Kenworth T660 — Other
High risk
Feb 12, 2008
Model years: 2008
On certain vehicles, the door latch may have been manufactured incorrectly. If the latch rotor cracks, the latch would not have primary or secondary closing security. Attempting to
Also affects: Kenworth 953, Kenworth C500, Kenworth K500, Kenworth T2000, Kenworth T300
Kenworth T660 — Steering
High risk
Dec 18, 2007
Model years: 2008
On certain trucks, an incorrectly manufactured steering gear sector shaft may cause the steering to "stick or bind". This could severely restrict the steering turning angle, possib
Also affects: Peterbilt 320, Peterbilt 389k, Kenworth T800, Kenworth C500, Kenworth T2000
Kenworth T660 — Other
High risk
Jun 21, 2007
Model years: 2005, 2006, 2007, 2008
On certain trucks, the removable front tow hitch assembly may fail. This could result in personal injury or property damage if the assembly failed during the un-decking or towing o
Also affects: Kenworth T2000, Kenworth T600, Kenworth T800, Peterbilt 385, Peterbilt 386
Kenworth T660 — Other
High risk
May 3, 2007
Model years: 2008
On certain trucks, engine cooling fan blades may develop cracks which could cause the fan to break apart, resulting in equipment damage or physical injury. Correction: Dealers will
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