WenmarOpen by Wenmar Pro

Service bulletin TIB-01-063

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10057786
Published by NHTSA2015-06-27
Manufacturer's numberTIB-01-063
Manufacturer's date2015-04-24
NHTSA componentEQUIPMENT

NHTSA's summary

KENWORTH: SOME TRUCKS SLEEPER HEATERS ARE EXPERIENCING A LEAKAGE FROM SLEEPER HEATER CORE O RING COOLANT. MODEL 2012-13 T680, T880. *PE

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Equipment and accessories

Vehicles listed
KENWORTH T6802012, 2013
KENWORTH T8002012 to 2013

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
12V3330002012-07-16. EQUIPMENT:OTHER:LABELS
12V3320002012-07-16. EQUIPMENT
12V2490002012-06-01. EQUIPMENT

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
02-1602021-03-10. Service bulletin. Information Only – Windshield washer pumps have a high No Trouble Found rate. Washer pumps may fail to spray due to a clogged filter.
51-0082021-02-01. Service bulletin. T680 predictive cruise control(PCC) incompatibility with cummins engine.
26-0372021-01-06. Service bulletin. Fix-As-Fail - Prior versions of Eaton Endurant transmission software may be prone to setting Linear Clutch Actuator (LCA) fault codes leading to possible LCA hardware replacement.
32-0162020-04-03. Service bulletin. Information Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment damage.
TIB43-0622019-10-04. Service bulletin. Information Only – This bulletin provides information about the California Air Resources Board (CARB) Periodic Smoke Inspection Program (PSIP) and Heavy Duty Vehicle Inspection Program (HDVIP).
01-0732019-09-05. Service bulletin. Fix as Fail HVAC system may demonstrate inadequate temperature control, be stuck in defrost mode, or have intermittent changes in fan speed that can be remedied with an updated HVAC software.
34-0772019-05-13. Service bulletin. Information Only: Proper instructions for closure of power distribution box cover to prevent corrosion.
34-0722019-01-07. Service bulletin. Information: J1939 CAN BUS Best Practices
41-0162017-03-27. Service bulletin. NON-SAFETY CAMPAIGN: REPLACE THE MOLDED AIR INTAKE PIPE, WHICH CAN CRACK AND ALLOW ROAD DEBRIS INTO THE ENGINE. DEBRIS ENTERING THROUGH THE INTAKE MAY CAUSE SEVERE ENGINE DAMAGE.
01-0682017-02-18. Service bulletin. FIX-AS-FAIL: AN INTERNAL ISSUE MAY CAUSE SOME HVAC MODE DOOR ACTUATORS TO FAIL. THIS WILL CAUSE THE HVAC SYSTEM TO ACT ERRATICALLY OR CONSTANTLY TURN ON AND OFF.