2018 Peterbilt 520 TSBs
48 Technical Service Bulletins across 10 categories
Categories
Electrical
14 bulletinsFix-As-Fail Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are available.
Read full bulletin
As a temporary solution, after PACCAR confirms a DEF sensor is not available, a temporary software update will allow a vehicle to continue operation with a failed DEF sensor by disabling the DEF sensor diagnostics.
Safety Recall Cummins Fuel Rail Leak NHTSA ID: 21V391 / TC: 2021-323, Cummins Recall: C2423.Cummins PX9 and ISX12 fuel...
Read full bulletin
rails may leak around a sealing washer, potentially resulting in fuel leaks.Undetected prolonged diesel fuel spray in the presence of an ignition source may increase the risk of fire.
The current chassis harness connector contains a wire that is no longer necessary with the latest electrical architecture.
Read full bulletin
The presence of the wire could result in a false fault code.
Information Only: This bulletin provides dealers with a battery warranty quick reference guide to ensure the...
Read full bulletin
appropriate tests for battery warranty are performed in order to prevent battery warranty claims filed with incorrect or incomplete information.
Fix as Fail: For all conventional models, except 387/587, equipped with Side-of-Cab (SOC) exhaust and built from...
Read full bulletin
03/6/2006 to 1/20/2020, the clamps that secure the SOC exhaust stacks may not be tightened properly. This may allow the exhaust stack to rotate and contact the cab or sleeper.
Fix as Fail: Model 520 trucks manufactured between 6/20/2017 and 8/10/2018 with LH and RH Steer may have a...
Read full bulletin
Recirculation Air Blend Door that does not work properly. Resolution is to remove the unneeded circuit and seal the wires.
Information Only Vehicles may have the connector seals on the wheel speed sensor incorrectly installed, which may lead...
Read full bulletin
to water intrusion and corrosion in some vehicles.
Information Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment damage.
Information Only: Vehicles may have the connector seal on the wheel speed sensor incorrectly installed, which may lead...
Read full bulletin
to sensor corrosion.
Fix as Fail: Peterbilt has initiated an improvement to the Model 320/520 power window module.
Read full bulletin
A vapor barrier will be installed over the module to prevent moisture.
Information Only - Quick Reference Guide for Electric harness damage repairs.
Non Safety Campaign: Vehicles were built with a 5 bolt supply wire for the air dryer pressure sensor that is no longer...
Read full bulletin
required with current architecture. If left in place, a fault code P1644 may be set.
Non-Safety Campaign - Installation of 3rd Eye Camera Harnesses on vehicles built missing this component.
Non-Safety Campaign - Installation of 3rd Eye Camera Harnesses on vehicles built missing this component.
Engine
10 bulletinsEPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX...
Read full bulletin
engines.
Info Only Unnecessary starter replacements can result from customer complaints regarding engine starting issues.
Read full bulletin
A new Starter Troubleshooting Guide has been created to provide a comprehensive list of starting system checks, which should reduce unnecessary starter replacements and associated warranty claims. Engine starting system warranty claims now require a completed Starter Checklist, a Battery Pack Midtronics Report, and a Cable Drop Midtronics Report. Claims filed without these documents may be denied.
Fix As Fail The height control valve (HCV) rod on vehicles with low air leaf suspensions is prone to toggling over center during rough road conditions.
Read full bulletin
With full suspension articulation, HCV bracket flexes and toggles over center the HCV linkage, which results in either deflated airbags or makes them unable to inflate. Fix-as-fail start date is 07/30/2024.
Certain Engine Model Year 2018 PACCAR MX-11 engines must have the crankcase pressure sensor replaced due to...
Read full bulletin
contamination during assembly.
Info Only - PACCAR is introducing Over-the-Air (OTA) software updates for engine MY17 and newer chassis equipped with...
Read full bulletin
Cummins X15, X12, ISX12, ISX12N, L9N, PX-7, and PX-9 engines The technology will leverage the existing Remote Diagnostic cs hardware to deliver secure software updates remotely. This will reduce downtime and save on maintenance costs for eligible vehicles.
An engine software update is required to resolve OBD system readiness, DEF doser diagnostics, and otherOBD system...
Read full bulletin
software related issues.
Safety Recall: Peterbilt has decided that certain Model 320 and 520 trucks built between 2/20/2015 and 7/16/2019 may...
Read full bulletin
have been built without a quick release valve. The absence of this valve could affect rear brake timing on certain vehicles equipped with a tri-drive or liftable tag axle and Dual Seated or Right Hand Stand-Up steering configurations. Resolutoin is to inspect for a quick release valve installed, and if there is not one, to install a quick release valve.
Fix-As-Fail - Composite fittings used in the cooling system may crack, resulting in coolant leaks.
Read full bulletin
Brass fittings are available to replace the composite fittings.
Non-Safety Campaign: Identified Model 520 vehicles, equipped with natural gas engine, were built with a compressor...
Read full bulletin
supply hose with reinforced spring that could break loose and cause internal engine damage.
Safety Recall: INTERIM NOTIFICATION - Peterbilt Motors Company has determined that a defect, which relates to motor...
Read full bulletin
vehicle safety, exists in certain model year 2017, 2018, 2019 and 2020 Model 520 vehicles manufactured between October 17, 2016 and March 04, 2019 with left hand or right hand single steer Power Distribution Center (PDC) harnesses. The power wire to the PDC may be inadequate and unable to accommodate the current draw. This can cause the wire to overheat and potentially melt the cab power harness connector. This could cause a loss of power to the cab and engine, which may result in the engine shutting down. A sudden loss of engine power could increase the risk of a crash.
Other
5 bulletins"Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes.
Read full bulletin
2 chassis added to the chassis list. Peterbilt: Dealers should check the chassis list and SIR weekly for VIN changes. 10 chassis added to the chassis list."
Fix-As-Fail PX9 oil pan may leak due to improper hardware.
Read full bulletin
Revised hardware will resolve the leak.
DEF tank covers may become loose and potentially crack on vehicles built before October 2019 with DEF tank part number...
Read full bulletin
M86-6221-003**(TANK-DEF MEDIUM ASSY) and M86-6222-003**(TANK-DEF LARGE, ASSY). Resolution is to resolve the vibration on the tank cover by adding bottom tank washers.
Information only: Some model 320 and 520 vehicles built before 3/11/2019 may experience loss or loosening of doghouse insulation.
Read full bulletin
Reference the procedure in the attachment section to properly remove and replace the insulation.
Fix-As-Fail: Two separate causes have been identified as root cause of intermittent low coolant indicator illumination.
Pre-Delivery & Maintenance
4 bulletins7/700 Service Agreement - Letter Only.
Information only: Hendrickson Softek front axle maintenance intervals and requirements.
Information Only This bulletin provides information about the California Air Resources Board (CARB) Periodic Smoke...
Read full bulletin
Inspection Program (PSIP) and Heavy Duty Vehicle Inspection Program (HDVIP).
Non-Safety Campaign - Installation of sun visor on vehicles built missing this component.
Software & Calibration
4 bulletinsThe service information for Bendix Air Dryer maintenance is being updated to include new procedures.
Information Only - Vehicles built with NAMUX software from 2013 to present may experience accuracy issues with the tachometer.
Read full bulletin
The issue can be temporarily resolved using any one of the included procedures.
Information: Bendix ACOM Software version 6.16.5.0 for diagnostics may introduce an unrecoverable error.
Read full bulletin
Notice to dealers to replace this version with older software version until Bendix introduces new version.
Information - Recommended Practices for Updating ESA Software
Body & Paint
4 bulletinsInformation Only Windshield washer pumps have a high No Trouble Found rate.
Read full bulletin
Washer pumps may fail to spray due to a clogged filter.
Fix as Fail: Some model 520 right hand stand up vehicles built before 07/16/19 are experiencing washer fluid leakage...
Read full bulletin
from the windshield reservoir through the vent line. Resolution is to replace the current washer fluid line with a longer length.
Information Only: Proper instructions for closure of power distribution box cover to prevent corrosion.
Fix-As-Fail: Vehicles may have been built with windshield structure that is not to specification.
Read full bulletin
Resolution is guided by District Service Manager review of issue.
Brakes
3 bulletinsFix-As-Fail - Bendix New-Gen Lightweight Steer Axle Drum Brake Spider Cracking
Safety Recall Bulletin: Updated with permanent repair path for phase 1 vehicles.
Read full bulletin
The Tractor ABS Lamp May Not Illuminate When ABS Controller Loses Battery and/or Ignition Power. NHTSA recall number is 18V368. Non compliance to FMVSS and CMVSS 121 and 136. Resolution is to Reflash software.
Safety Recall: Vehicles fail to confirm with FMVSS/CMVSS No 108 Table 1-a requirements which requires 2 red stop lamps.
Read full bulletin
Vehicles were equipped with additional amber stop lamps which may illuminate when the brake is applied, and may confuse other drivers. Resolution is to remove the amber stop lamps and associated wiring.
HVAC & Climate
2 bulletinsInfo Only Certain 520 model chassis built between 2014 and 2021, and equipped with the Red Dot HVAC system, may have...
Read full bulletin
service port spacing which will not allow the connection of a pressure gauge to both the high and low side service ports simultaneously. A specific tool is available from the supplier that will allow a technician to bypass this design issue.
Information Only: This bulletin provides guidance for repairing an air-conditioning system after internal failure of the...
Read full bulletin
A/C compressor.
Fuel System
1 bulletinDue to major data carriers phasing out 3G networks, chassis currently utilizing first generation Peoplenet Mobile...
Read full bulletin
Gateway (PMG001) will experience severe 3G service degradation as early as January of 2022. Chassis currently utilizing 3G antennas as a primary antenna may experience this degradation.
Lighting
1 bulletinFix as Fail: Peterbilt has introduced an improved mounting bracket for low mount air tanks for vehicles built between...
Read full bulletin
January 01, 2017 and July 06, 2020. Torsional vibration may stress the currently-installed brackets and cause them to fail near the bottom of the frame rail.