Vehicle description: school buses, medium duty trucks and tractors built with bendix air ABS with an EC-17 1030r electronic control unit (ecu), there have been reports of unwanted ABS activation at low speeds caused by 1) chafed ABS wheel speed sensor wires on rotating parts or 2) a damaged component at the wheel end that generates a certain type of…
Risk and remedy
Risk
This condition could cause the ABS ecu to exhaust the air at the air brake modulators for one or more of the wheels. this could result in extended braking distances and a possible crash.
Vehicle description: medium duty trucks equipped with air brakes and anti-lock brake systems. chaffing of the electric brake control harness can occur resulting in an electrical grounding condition. this will illuminate a warning light on the instrument panel and shut off the ABS feature.
Risk and remedy
Risk
This condition can cause reduced braking capability of the front brakes, increasing the risk of a crash.
Remedy
Dealers will inspect the harness for chaffing and proper routing and will repair if necessary.
Technical service bulletins and other communications the manufacturer sent dealers about this vehicle. Ask a dealer for the full document by its number.
10248444Vehicle Recalls
10246631Expanded Availability for Remanufacture and Return (R&R) Electronic Control Modules
10232287This warranty administration bulletin provides information regarding the field action courtesy transportation policy.
6092588Experiencing noisy release bearing, slipping clutch or inoerative clutch.
635013Subject regarding vibration or transmission output shaft damage / oil seal leak on conventional cab medium duty models.
634991Information pertaining to the release of the exhaust manifold / turbocharger heat shield.
622959Some drivers may comment that the generator upper mounting bolt IS breaking on certain conventional medium duty models.
619394Some customers may comment that the windshield (w/s) washer reservoir shows an unexplained reduced fluid level after vehicle operation.
617728Some drivers may comment about the ABS lamp illuminating. An ABS diagnostic trouble code 0281 - brake switch circuit may have been set on those vehicles equipped with hydraulic brakes. The diagnostic trouble code will be stored in memory and the ABS will be disabled.
617721Some medium duty models with 3126 caterpillar diesel engine and allison automatic transmission may exhibit an engine speed power takeoff (pto) operation returning to idle for no apparent reason.
613606On some medium duty trucks equipped with a diesel engine, air brakes, and the engine shutdown feature, the multi-function alarm module may not perform certain features such as: no warning tone for air brake low pressure; no warning tone for check gages; no low coolant telltale lamp or warning tone; and no engine shutdown function for low coolant or low oil pressure or high coolant temperature. **Mr
612993Some vehicles equipped with air brakes and anti-lock brake systems, may exhibit brake control electrical harness chafing.
612674Some vehicles may experience on the cab assist step cracking around the mounting bolts. *Mjs
611294Some owners may comment on the cab assist step cracking around the mounting bolts.
606369On some medium duty conventional models, the radiator surge tank cap contacting underside of hood.
602989Erratic or premature upshifts, harsh down shifts, engine lugging, or low power performance.
Every Chevrolet C6500 model year
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