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2001 Gmc B7

Component

Service Brakes, Air:Antilock

Consequence of Defect

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 erratic sensor signal.

Corrective Action

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.

Recall Notes

dealers will replace the abs ecu.

2000 Gmc B7

Component

Service Brakes, Air:Antilock

Consequence of Defect

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 erratic sensor signal.

Corrective Action

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.

Recall Notes

dealers will replace the abs ecu.

2000 Gmc B7

Component

Engine And Engine Cooling:Engine:Gasoline

Consequence of Defect

certain medium duty c-series and b7 school bus chassis equipped with a 7.4 liter gas engine and an impco lpg conversion kit. some of these vehicles may have engine backfires with sufficient force to damage the engine air intake system and the air cleaner filter element.

Corrective Action

if the damaged air cleaner parts are dislodged from their normal position, these parts could come in contact with the hot exhaust manifold and/or hot exhaust gas recirculation (egr) valve tube resulting in a possible engine compartment fire.

Recall Notes

dealers will install a redesigned mixer bonnet and air cleaner housing cover, selective upgrades in various connections related to the air induction system, and if needed, a new air cleaner filter. owner notification began december 18, 2002. owners who take their vehicles to an authorized dealer on an agreed upon service date and do not receive the free remedy within a reasonable time should contact chevrolet at 1-800-222-1020 or gmc at 1-800-462-8782.

2000 Gmc B7

Component

Power Train:Automatic Transmission

Consequence of Defect

vehicle description: medium duty trucks. the transmission fluid could leak from a heat degraded transmission fluid cooler hose onto the exhaust system on the passenger's side of the vehicle.

Corrective Action

this condition could result in a fire.

Recall Notes

dealers will install a new transmission fluid cooler inlet hose and outlet hose designed with a heat sleeve and ensure adequate clearance to the exhaust system take-down pipe. dealers will also inspect the right-hand exhaust manifold seal for leakage, and replace if necessary.

1999 Gmc B7

Component

Service Brakes, Air:Antilock

Consequence of Defect

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 erratic sensor signal.

Corrective Action

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.

Recall Notes

dealers will replace the abs ecu.

1999 Gmc B7

Component

Power Train:Automatic Transmission

Consequence of Defect

vehicle description: medium duty conventional cab trucks and school bus chassis equipped with an automatic transmission, have transmission shift cable end rods that have not been crimped to the proper specification. over time, the shift cable could be pulled out of the rod end causing the driver to lose the ability to manually change transmission gears.

Corrective Action

with this condition, the vehicle may move in a direction not anticipated by the driver, increasing the risk of a crash.

Recall Notes

dealers will install a new shift cable.

1999 Gmc B7

Component

Power Train:Automatic Transmission

Consequence of Defect

vehicle description: medium duty trucks. the transmission fluid could leak from a heat degraded transmission fluid cooler hose onto the exhaust system on the passenger's side of the vehicle.

Corrective Action

this condition could result in a fire.

Recall Notes

dealers will install a new transmission fluid cooler inlet hose and outlet hose designed with a heat sleeve and ensure adequate clearance to the exhaust system take-down pipe. dealers will also inspect the right-hand exhaust manifold seal for leakage, and replace if necessary.

1998 Gmc B7

Component

Service Brakes, Air:Antilock

Consequence of Defect

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 erratic sensor signal.

Corrective Action

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.

Recall Notes

dealers will replace the abs ecu.

1998 Gmc B7

Component

Electrical System:Wiring:Front Underhood

Consequence of Defect

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.

Corrective Action

this condition can cause reduced braking capability of the front brakes, increasing the risk of a crash.

Recall Notes

dealers will inspect the harness for chaffing and proper routing and will repair if necessary.

1998 Gmc B7

Component

Steering:Gear Box (Other Than Rack And Pinion)

Consequence of Defect

vehicle description: school buses equipped with power steering. some of these vehicles were assembled with an incorrect intermediate steering shaft. the overlap in the slip joint is insufficient allowing the steering shaft to separate.

Corrective Action

this could lead to loss of steering, increasing the risk of a vehicle crash.

Recall Notes

dealers will inspect the steering shaft and, if necessary, replace the intermediate steering shaft.

1997 Gmc B7

Component

Steering:Hydraulic Power Assist:Hose, Piping, And Connections

Consequence of Defect

vehicle description: school buses equipped with 6.0l gasoline engine, 10,000 lb. front axle, and power steering. the power steering fluid can leak as a result of a power steering fluid supply hose interference condition.

Corrective Action

eventually, all power steering assist would cease, resulting in a loss of steering control.

Recall Notes

dealers will install a new power steering hose and adapter.

1997 Gmc B7

Component

Steering:Gear Box (Other Than Rack And Pinion)

Consequence of Defect

vehicle description: school buses equipped with power steering. some of these vehicles were assembled with an incorrect intermediate steering shaft. the overlap in the slip joint is insufficient allowing the steering shaft to separate.

Corrective Action

this could lead to loss of steering, increasing the risk of a vehicle crash.

Recall Notes

dealers will inspect the steering shaft and, if necessary, replace the intermediate steering shaft.

1995 Gmc B7

Component

Power Train:Automatic Transmission:Cooling Unit And Lines

Consequence of Defect

this is not a safety recall in accordance with federal regulation 573. however, it is deemed a safety improvement campaign by the agency. the transmission oil cooler hose assemby can rupture.

Corrective Action

this can result in loss of sufficient transmission fluid to cause the transmission to stop transmitting power to the rear wheels and could also cause severe transmission damage.

Recall Notes

dealers will replace the suspect transmission oil cooler hoses with parts that meet specifications.

1995 Gmc B7

Component

Exterior Lighting:Back Up Lights

Consequence of Defect

these vehicles were assembled with a transmission reverse signal switch that could leak causing loss of electrical contact when the transmission is in reverse. this does not meet the requirements of fmvss no. 108, "lamps, reflective devices, and associated equipment."

Corrective Action

consequence of non-compliance: this condition can prevent the backup warning system (lights and audible alarms) from operating properly, increasing the potential for an accident.

Recall Notes

dealers will replace the reverse signal pressure switch.

1993 Gmc B7

Component

Steering:Gear Box (Other Than Rack And Pinion)

Consequence of Defect

the intermediate steering shaft was assembled with loose or missing upper and lower pinch bolts which may cause separation of the shaft.

Corrective Action

separation of the intermediate steering shaft results in total loss of steering control and could cause an accident.

Recall Notes

dealers will properly torque loose pinch bolts and install pinch bolts where necessary.

1993 Gmc B7

Component

Vehicle Speed Control

Consequence of Defect

a manufacturing condition in the throttle body injector (tbi) unit might occur to allow the throttle cam lever to disengage from the throttle drive shaft.

Corrective Action

if the throttle cam lever disengages from the throttledrive shaft, the engine could go to wide open throttle without prior warning.this loss of vehicle accelerator control could result in a vehicle crash.

Recall Notes

replace the throttle drive cover assembly.