- The problem
- PACCAR Incorporated (PACCAR) is recalling certain 2009-2021 Kenworth C500, 2012-2021 Kenworth T440, 2009-2015 Kenworth T660, 2015-2024 Kenworth T680, 2009-2024 Kenworth T800, 2009-2020 Kenworth T370, 2014-2023 Kenworth T880, 2011-2016 Kenworth T470, 2023 Kenworth T480, and 2009-2019 Kenworth W900 vehicles. The air tanks have an insufficient volume of air for the brake system. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."
- The risk
- Insufficient air volume can reduce braking performance and increase the risk of a crash.
- The fix
- Dealers will install the correct volume air tanks, free of charge. Owner notification letters were mailed August 12, 2024. Additional owner notification letters were mailed October 27, 2025. Owners may contact PACCAR customer service at 1-425-828-5888. PACCAR's number for this recall is 24KWD.
Vehicle safety record
2011 Kenworth T660 Problems, complaints & recalls
Owners have filed 1 complaint about the 2011 Kenworth T660 with NHTSA, most often about the brakes (1). It is covered by 13 recalls, the latest in February 2024 for the reservoir / tank. For comparison, the 2010 has 2 and the 2012 has 1.
NHTSA data checked
DMore problems than a typical T660 year, for its age
#343 most complained-about 2011 vehicle
- Complaints
- 1
- Recalls
- 13
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
Most common 2011 Kenworth T660 problems
Share of all 1 complaints. One complaint can name more than one area. Tap an area for its complaints and recalls.
2011 Kenworth T660 recalls 13
Recall repairs are free. Your dealer fixes them whether or not you bought the car there - check your VIN at nhtsa.gov/recalls to see if yours is done. What to do
- The problem
- PACCAR Incorporated (PACCAR) is recalling certain 2008-2019 Peterbilt 330, 335, 337, 340, 348, 365, 367, 384, 386, 387, 388, 389, 567, 579 and 587 vehicles and 2008-2020 Kenworth T170, T270, T370, T660, T680, T800, T880, and W900 vehicles equipped with NAMUX Software. In the event that the Anti-lock Brake System (ABS) loses battery and/or ignition power to the controller, the dash warning light for the ABS may not illuminate to warn the driver of the loss of ABS. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 121, "Air Brake Systems," and 136, "Electronic Stability Control System on Heavy Vehicles."
- The risk
- If the driver unknowingly operates the vehicle without the ABS functioning, there would be an increased risk of a crash.
- The fix
- PACCAR will notify owners, and dealers will update the NAMUX software within the cab control module, free of charge. PACCAR issued owners an interim notification on June 4, 2020. The recall began May 26, 2020. Owners may contact Kenworth customer service at 1-425-828-5888 or Peterbilt customer service at 1-940-591-4220. PACCAR's number for this recall is 20pbc AND 20KWB.
- The problem
- PACCAR Incorporated (PACCAR) is recalling certain model year 2011-2016 Kenworth T440, T470, T660, T680, and T880 trucks manufactured January 14, 2010, to May 22, 2015, and equipped with HID Headlamps and the option for Daytime Running Lamps (DRL). The DRLs are required to deactivate when the hazard warning lights are activated, however, the DRLs on these vehicles override the hazard flashing functionality after the brake pedal is pushed for more than two seconds. Normal hazard flashing functionality returns once the service brake is released. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 108, "Lamps, Reflective Devices, and Associated Equipment."
- The risk
- If the hazard warning lamps are overridden by the DRL, oncoming vehicles may fail to be warned, increasing the risk of a crash.
- The fix
- Kenworth will notify owners, and dealers will update the cab controller software, free of charge. The recall began on September 167, 2015. Owners may contact Kenworth customer service at 1-425-828-5000. Kenworth's number for this recall is 15KWL.
- The problem
- PACCAR Incorporated (PACCAR) is recalling certain model year 2011-2016 Kenworth T270, T370, T440, T470, C500, C540, C550, T660, T800, W900, and 963 trucks manufactured November 1, 2010, to April 6, 2015. In the affected trucks, water may leak into the wiper motor.
- The risk
- As water leaks in, the wiper may cease to function on the 'intermittent' setting, reducing the driver's visibility and increasing the risk of a crash. Additionally, the water may cause corrosion which, over time, may result in an electrical short, increasing the risk of a fire.
- The fix
- PACCAR is still developing and testing a remedy. The recall is expected to begin in July 2015. An interim letter was sent to owners on July 2, 2015. The recall began on September 2, 1015. Owners may contact Kenworth customer service at 1-425-828-5000. PACCAR's number for this recall is 15KWF.
- The problem
- Paccar is recalling certain model year 2011-2012 kenworth t660, t700, and t800 vehicles manufactured from april 19, 2010, through may 13, 2011, and model year 2008, 2010, and 2011 peterbilt 365, 367, 384, 386, 387, 388 and 587 vehicles manufactured from april 20, 2010, through june 11, 2011, and equipped with paccar mx engines and eaton ultrashift dm or allison automatic transmissions (without auto-neutral). The fast idle control may be activated by the operator while the transmission is in gear.
- The risk
- If the fast idle control function is engaged with the transmission in gear, the vehicle could unexpectedly accelerate and override the parking brake and , creating a risk of a crash and damage to other vehicles or property and the potential for injury to nearby pedestrians.
- The fix
- Kenworth and peterbilt dealers will update the engine software for the affected chassis. This service will be performed free of charge. The safety recall began on august 22, 2011. Owners may contact kenworth at 1-425-828-5440 and peterbilt at 1-940-591-4196.
- The problem
- Paccar is recalling certain model year 2007-2011 kenworth c500, t2000, t600, and t660, as well as model year 2009-2011 peterbilt 387 and 388 trucks equipped with caterpillar c15 engine and manufactured from may 11, 2006, through september 17, 2010. Degradation of a combustion tube weld can cause radial heat impingement on the body which may burn through certain bodies used on c15 engines.
- The risk
- THIS COULD RESULT IN A FIRE.
- The fix
- Caterpillar is handling the owner notification and remedy for this campaign. Please see caterpillar's defect report 11e-006. Caterpillar will replace the single piece combustion tube with a thick wall combustion tube which will not allow the heat to break through. This service will be performed free of charge. Due to a parts supply issue, owners will be notified by the end of april 2011 about the safety defect, and will then be notified again once the free remedy is available, currently estimated to be around late july 2011. Owners may contact caterpillar toll-free at 1-800-447-4986.
- The problem
- Paccar is recalling certain model year 2011-2012 kenworth t270/370, t440/t470, t800, t660, w900 and c500 vehicles manufactured between october 18, 2010, and january 28, 2011. Certain cast iron slack adjuster housings, which transmit braking force from the brake chamber push rod to the brake cam tube, may include a flow notch in the handle portion of the housing due to an error during the casting process. A flow notch in the handle portion may reduce the effective cross section structure and cause the slack adjuster housing to fracture.
- The risk
- If the slack adjuster housing were to fracture, the wheel brake to which the slack adjuster housing is attached would no longer function, which could increase vehicle stopping distances, and if mounted on the steer axle, could cause the vehicle to pull to one side during braking, increasing the risk of a crash.
- The fix
- Dealers will inspect and replace the slack adjuster housing as necessary. This service will be performed free of charge. The safety recall began on march 30, 2011. Owners may contact kenworth at 425-828-5440.
- The problem
- Paccar is recalling certain model year 2008-2012 kenworth t2000, t660, t700, t800, and w900, as well as model year 2009-2012 peterbilt 365, 367, 384, 386, 387, 388, 389, and 587 trucks equipped with paccar mx engines. The oil module centrifugal spinner filter cap in the paccar mx engine may become loose, possibly allowing the cap to come off and engine oil to partially discharge from the oil module onto exhaust components.
- The risk
- The discharge of engine oil onto exhaust components which are hot, such as when the engine is under significant load, may cause a fire.
- The fix
- Dealers will re-torque the oil module filter cap and install a secondary retention device on the secondary centrifugal spinner filter cap. This service will be performed free of charge. The safety recall is expected to begin during march 2011. Owners may contact kenworth at 1-425-828-5440 and peterbilt at 1-940-591-4196.
- The problem
- Kenworth is recalling certain model year 2011 t660 and t700 tractor trailers manufactured between august 9, 2010, and november 4, 2010. The safety latch feature that keeps the hood of the vehicle from closing after a user opens the hood may fail to operate.
- The risk
- Failure of the safety latch feature may cause the hood to unexpectedly close while open, increasing the risk of personal injury and/or vehicle damage.
- The fix
- Dealers will replace the dual magnets with a single magnet on the safety latch. This service will be performed free of charge. The safety recall began on february 28, 2011. Owners may contact kenworth at 1-425-828-5440.
- The problem
- Paccar is recalling certain model year kenworth t660 and t800 vehicles manufactured from september 13, 2010, through november 19, 2010, for failing to comply with the requirements of federal motor vehicle safety standard no. Part 567, "certification." The steer axle gawr and gvwr recorded on the vehicle's door labels may be inaccurate and overstate the actual load capacity of components installed on the vehicle.
- The risk
- This may lead to an owner overloading the vehicle which can increase the risk of a tire failure and crash.
- The fix
- Dealers will inspect and replace the door labels free of charge. The safety recall began on december 17, 2010. Owners may contact kenworth at 425-828-5440.
- The problem
- Paccar is recalling certain model year kenworth t660, t700, t800 and w900 vehicles manufactured from december 22, 2008, through august 2, 2010, and equipped with ag400l air disc brakes. The air disc brake caliper could be installed on the wrong side of the drive axle potentially causing interference with the suspension bracket and the rear suspension as the outermost brake pads wear and the floating caliper moves inboard.
- The risk
- As this interference gets larger, this could eventually lead to reduced braking performance, increasing the risk of a crash.
- The fix
- Dealers will verify the correct orientation of the brake caliper and perform the necessary repair free of charge. The safety recall began on november 24, 2010. Owners may contact kenworth at 425-828-5440.
- The problem
- Paccar is recalling certain model year kenworth and peterbilt vehicles. A manufacturing defect in the seal supplied by a component manufacturer installed on the output shaft of the exhaust gas recirculation (egr) valve actuator may cause eventual delamination of the seal. Delamination of the seal may allow engine oil to leak from the egr valve onto exhaust components.
- The risk
- The leaking of engine oil onto hot exhaust components, such as when the engine is under significant load, may create the possibility of a fire.
- The fix
- Dealers will replace the egr valve assembly on the subject vehicles equipped with the paccar mx engine. This service will be performed free of charge. The safety recall began on october 29, 2010. Owners may contact kenworth at 425-828-5440 and peterbilt at 940-591-4196.
- The problem
- Kenworth is recalling certain model year 2011 t660, t800, w900, c500, t440, and t470 vehicles manufactured from april 1, 2009, through august 30, 2010. One of the four harness spade terminal connections to the chassis load center may become completely unseated. A completely unseated connection may result in a power loss to a portion of the vehicle's exterior lighting.
- The risk
- Power loss of the vehicle's exterior lighting may reduce the visibility of the vehicle to other drivers increasing the risk of a crash with the vehicle.
- The fix
- Dealers will inspect the harness and re-seating the female connectors on the male spade terminals. This service will be performed free of charge. The safety recall began on october 29, 2010. Owners may contact kenworth at 1-425-828-5440.
What owners say
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1 complaints about the 2011 Kenworth T660
Newest first, as filed with NHTSA by owners.
During pre-trip inspection, service brake check failed, took to long to build up air pressure, ultimately, the system would not register any air pressure by gauge or physically.[[redacted]], [[redacted]] *js information redacted pursuant to the freedom of information act (foia), 5 u.S.C. 552(B)(6)
Kenworth T660: every year compared
All T660 years2011 Kenworth T660 vs rivals
| Vehicle | Complaints | Recalls | Grade | |
|---|---|---|---|---|
| 2011 Kenworth T660 | 1 | 13 | D | |
| 2011 Kenworth T700 | 1 | 7 | F | Compare |
More sales usually means more complaints, so compare similar vehicles of the same year. The grade compares each vehicle with its own model's other years.
Questions about the 2011 Kenworth T660
Does the 2011 Kenworth T660 have any recalls?
Yes - NHTSA lists 13 recalls for the 2011 Kenworth T660: reservoir / tank (February 2024); electronic stability control (ESC) (April 2020); hazard flashing warning lights (July 2015); motor (May 2015) and more. Recall repairs are free at any authorized dealer. Enter your VIN at nhtsa.gov/recalls to see whether yours has been fixed.
What are the most common problems with the 2011 Kenworth T660?
By the complaints owners filed with NHTSA, the most common problem areas are the brakes (1).
How many complaints has the 2011 Kenworth T660 had?
1 complaints have been filed with NHTSA, the first on September 24, 2013 and the latest on September 24, 2013. Of these, 0 describe a crash and 0 a fire, and together they report 0 injuries and 0 deaths.
Is the 2011 Kenworth T660 a reliable vehicle?
Its Safety Index is 32 out of 100 (grade D: more problems than a typical Kenworth T660 year, for its age). The index weighs complaints, crashes, fires, injuries, deaths and recalls against how long the vehicle has been on the road, compared with the same model's other years. It is not a measure of every repair - read the complaints and owner experiences, and have any used vehicle inspected before you buy.
Which Kenworth T660 years have the most complaints?
2008 (2), 2010 (2), 2011 (1). See every Kenworth T660 year compared.
What should I do if my 2011 Kenworth T660 has a problem?
If it is a safety problem, stop driving it if it is unsafe and contact your dealer. Report it to NHTSA at nhtsa.gov/report-a-safety-problem - enough reports start investigations and recalls - and share your experience here so other owners know what to look for.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data