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Source reference 2001-01-02

Manufacturer communication — 1998 GMC YUKON

Reporter type: Manufacturer

Vehicles as recorded

What the manufacturer’s document says

fault and correction ・ names this vehicle

Applies to

  • On 1998-2001 Silverado, Sierra, Tahoe, Suburban, Yukon and Yukon XL, the steering wheel may shake violently or vibrate at road speed after driving 10 or more miles.

    the passage
    On 1998-2001 Silverado, Sierra, Tahoe, Suburban, Yukon, and Yukon XL, the steering wheel may shake violently or vibrate at road speed after driving 10 or more miles.

Fault

  • The condition may get worse the longer the vehicle is driven and may be aggravated by applying the brake.

    the passage
    The condition may get worse the longer the vehicle is driven, and may be aggravated by applying the brake.

  • The customer may say the shake or vibration started in the steering wheel and then spread throughout the truck as they continued to drive.

    the passage
    The customer may advise that the shake or vibration started in the steering wheel and then spread throughout the truck, as they contin- ued to drive the vehicle.

Finding the cause

Steps to confirm (in the document’s order)

  1. When the concern is duplicated, place your left foot under the brake pedal and lift up on the pedal.

    the passage
    When the concern is duplicated, place your left foot under the brake pedal and lift up on the pedal.

  2. If the concern remains, continue with vibration diagnosis as noted in the service manual.

    the passage
    If the concern remains, continue with vibration diagnosis as noted in the service manual.

Correction

Repair

  • If the shake or vibration goes away, replace the brake booster assembly.

    the passage
    If the shake or vibration goes away, replace the brake booster assembly.

What is needed

Parts and materials
  • Brake booster assembly (when the shake or vibration goes away with the brake pedal lifted)
Labor time
Not stated
Special tools
Not stated
Scan tool
Not stated

Only what the technical documents state. "Not stated" does not mean not needed.

Compiled by reading the full text of the document; each point stands on the passage shown. Check the document itself, linked below, before working on a vehicle.

Stated content

  1. Communication summary

    断続的な激しいステアリングホイールの振れ、または巡航速度での振動 1998-2001年式 Silverado、Sierra、Tahoe、Suburban、Yukon、Yukon XL で、10マイル (= 16.1 km)以上走行した後、巡航速度でステアリングホイールが激しく振れる、または振動することがある。 この状態は車両を長く走らせるほど悪化することがあり、ブレーキをかけるとひどくなることがある。 ユーザーは、振れや振動がステアリングホイールから始まり、走行を続けるうちにトラック全体に広がったと申し出ることがある。 不具合が再現したら、左足をブレーキペダルの下に入れてペダルを持ち上げる。 振れや振動が消えれば、ブレーキブースター ASSY を交換する。 不具合が残る場合は、サービスマニュアルに記載のとおり振動の診断を続ける。 Machine translation (unreviewed)

    Intermittent Violent Steering Wheel Shake, or Vibration at Road Speed On 1998-2001 Silverado, Sierra, Tahoe, Suburban, Yukon, and Yukon XL, the steering wheel may shake violently or vibrate at road speed after driving 10 or more miles. The condition may get worse the longer the vehicle is driven, and may be aggravated by applying the brake. The customer may advise that the shake or vibration started in the steering wheel and then spread throughout the truck, as they contin- ued to drive the vehicle. When the concern is duplicated, place your left foot under the brake pedal and lift up on the pedal. If the shake or vibration goes away, replace the brake booster assembly. If the concern remains, continue with vibration diagnosis as noted in the service manual.
    Go to this passage in the original

Source

Source
GM TechLink
Source reference
2001-01-02
Received by source
2001-01-01
Incident date
Unknown

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