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Service bulletins for the 2020 Western Star 4700

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

163 on file from NHTSA, as of 2026-10-19.

By type

By component

Bulletins, newest first
SBW72-008REV2020-05-23. Service bulletin. STRUCTURE; VISIBILITY:POWER WINDOW DEVICES AND CONTROLS. Service Bulletin for Window Regulator Retrofit. The bulletin dated December 4, 2019 has been revised to include 4800 Models. Beginning 04/01/2019 Western Star cab doors were updated to a new style regulator and window. When replacing an older style regulator or window the vehicle must be retrofitted to the new style regulator and window.
SBW54-074REV2020-05-14. Service bulletin. EQUIPMENT. Revision for Service Bulletin for Western Star 4700/5700 Pana-Pacific 540 Radio Controls Not Operating Normally. This bulletin replaces the version dated 03/25/2020. Pana-Pacific DEA540 radios (A22-74389-000, A22-77161-000) may cease to respond to volume control settings from the steering wheel switches or the controls on the radio faceplate, resulting in erratic volume control. This bulletin replaces the version dated March 26, 2020.The procedure to check the current software version of the radio is updated.
WI20-0082020-04-28. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Warranty Information Letter for Warranty Training Online. DTNA is pleased to announce the release of new Warranty-related training videos. The videos provide Warranty content in short instructional videos that are available on demand through the AftermarkeTV Video Channel icon on the Aftermarket Resource Center (ARC) home page.
WP20-0072020-04-23. Service bulletin. EQUIPMENT. Warranty Policy Letter for Chassis Progressive Damage Policy Change. Effective for repair orders opened on or after April 27, 2020, if an Authorized Service Location installed a part which later has a warrantable failure, progressive damage and labor may be covered under the Aftermarket Parts Limited Parts Warranty (Parts Warranty).
WP20-0062020-04-23. Service bulletin. EQUIPMENT. Warranty Policy Letter for Handling for Authorized Service Location Part Transfers. To promote 24-hour throughput and maximum efficiency, DTNA is adjusting multiple handling policies: Launching a new handling allowance for parts ordered from another Authorized Service Location because the facing Part Distribution Center (PDC) is out of stock Retiring Detroit's Customer First Program
WP20-0052020-04-23. Service bulletin. EQUIPMENT. Warranty Policy Letter for Handling Change: Over the Counter Aftermarket Parts Replacement Program. DTNA is pleased to announce that handling will increase to 33% for Misc. Replacement Part type claims filed under the Over the Counter (OTC) Aftermarket Parts Replacement Program.
WI20-0042020-04-23. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. Warranty Information Letter for Warranty Long Block Program Change. The Detroit Reman Long Block Program has expanded. The expansion reduces complexity in ordering reman engines and promotes stocking reman engines to meet uptime commitments.
SBW54-0752020-04-18. Service bulletin. ELECTRICAL SYSTEM; BACK OVER PREVENTION. Service Bulletin for Lengthening the Backup Light Harness. Though the back-up light harness is long enough to connect to the backup light switch, it may be short enough that the wire seals in the connector can be stressed. Moisture entering through the seals can cause corrosion, resulting in a bad connection and/or failure of the switch. As a result, backup lights and, if equipped, the backup alarm, may not function when the vehicle is shifted into reverse.
CALFTLWS000-012020-04-09. Service bulletin. TIRES; WHEELS. Customer Advisory Letter for GWR Label Correction. Freightliner 108SD/114SD, Coronado, New Cascadia, and Business Class M2 vehicles and Western Star 4700 and 4900 vehicles equipped with a certain tire rating have the wrong Component GWR label. DTNA is requesting the current Component GWR label be replaced with the correct label.
CALWS54-0022020-03-31. Service bulletin. ELECTRICAL SYSTEM. Customer Advisory Letter for 6TS RP1226 Dash Harness Circuit Correction. Western Star model 4700 and 5700 vehicles may have reversed terminals 1 and 7 in the 14 pin connector on the A66-12703-000 harness for 6TS that offers the RP1226 connector in the dash.
SBW54-074REV2020-03-25. Service bulletin. STEERING; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Revision for Service Bulletin for Western Star 5700 Pana-Pacific 540 Radio Controls Not Operating Normally. This bulletin replaces the version dated 02/07/2020. Pana-Pacific DEA540 radios (A22-74389-000, A22-77161-000) may cease to respond to volume control settings from the steering wheel switches or the controls on the radio faceplate, resulting in erratic volume control. Information about the firmware version this SB applies to has been included, the 4700 was added to the model list, and part numbers have been corrected.
20CSA-042020-03-22. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. Customer Service Announcement saying that Service Pack (SP) 3 for DiagnosticLink® 8.11 Standard and Professional will be available for download from the Detroit Diesel server.
03.2020 Campaign2020-03-18. Service bulletin. EQUIPMENT. Open recall and Field service Campaigns report send out to Dealers, General Managers, Service managers and warranty managers.
WP20-0022020-03-17. Service bulletin. STRUCTURE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Warranty Policy Letter explaining the Warranty Department is aligning with the frame rail repair policy, published in DTNA Workshop Manuals, which states that there are very few cases in which welding a heat-treated frame rail is allowed. Therefore, before welding anything on a frame rail, contact the applicable regional service representative for approval.
20TS-022020-03-06. Service bulletin. ENGINE AND ENGINE COOLING. Technical Service Letter for DD Platform Heavy Duty, Metal in the Oil and Oil Filter. Some engine component failures can cause metallic debris to circulate throughout the engine lubrication system. Although the oil filter will capture most of this debris, some debris may enter the clean side of the lubrication system during oil filter bypass. Detroit has created a lubrication system cleaning and flushing procedure to address this problem.
20CSA-032020-03-06. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Customer Service Announcement saying that Service Pack (SP) 2 for Diagnostic Link 8.11 Standard and Professional will be available for download from the Detroit Diesel server.
02.2020 Campaign2020-03-04. Service bulletin. EQUIPMENT. Open recall and Field service Campaigns report send out to Dealers, General Managers, Service managers and warranty managers
SBW41-0022020-03-03. Service bulletin. POWER TRAIN. Service Bulletin for Midship Bearing Replacement for built vehicles with driveshafts SPL140, SPL170 or SPL250 with first order driveline vibration. This version replaces bulletin from 12/19/19.
SS10341792020-02-20. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Service Solution on Western Star speedometers. For certain speedometers the speedometer may drop out or the odometer may reset to zero.
SBW54-0612020-02-15. Service bulletin. ELECTRICAL SYSTEM. Service Bulletin for Guidelines for Repairing or Replacing an Electrical Harness. Use the guidelines in this bulletin to determine if a damaged electrical harness should be repaired or replaced.
WP20-001REV2020-02-15. Service bulletin. POWER TRAIN; LANE DEPARTURE; SUSPENSION; EQUIPMENT. Revision to a Warranty Policy Letter announcing the One Stop Supplier Extended Program Launch. The One Stop Supplier Extended Program streamlines the claim filing process because with One Stop Supplier Extended, the service network will file claims for some supplier-supported coverages in OWL. Revisions are in blue.
20CSA-022020-02-01. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Customer Service Announcement reminding service locations to update their DiagnosticLink software. To maintain access to the Detroit server, all DiagnosticLink computers must be updated with the current version of DiagnosticLink software. all DiagnosticLink 8.08 installed versions will be disabled as of Tuesday, January 28, 2020.
20CSA-012020-02-01. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ENGINE AND ENGINE COOLING. Customer Service Announcement for a policy change regarding Detroit Service Information Bulletins (SIBs) will now have a 60-day expiration, starting on the release day of the bulletin. The intent of a SIB is to notify the service network of a major change to one or more service procedures. Do not save SIBs nor reference them for repairs, as they are uncontrolled and never updated.
SS10346152020-01-28. Service bulletin. VISIBILITY; EQUIPMENT ADAPTIVE/MOBILITY. Service Solution for Western Star Velvac Door Mirror Seal Curling. The rubber that is rolling back is actually a rubber tape. Originally, the mirrors did not have this tape. Velvac added the tape to address some whistling complaints from customers.
SS10346072020-01-21. Service bulletin. STRUCTURE. Service Solution for WST 4700 In Cab Floor Raceway Cover Corrosion. Some Western Star 4700 trucks experience rust through of the steel raceway covers located on the cab floor. This is typically seen in applications where the truck is run in environments where harsh chemicals are used such as salt in snowplow applications.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.