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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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1 conditions added

Common on this vehicle:LeakSmoke or fireReduced brakingNoise

issueHydro-boost brake assist and power steering share one hydraulic supply (four campaigns)Remove

Possible causes

Noise1 records
Brakes
Body, doors and interior
Transmission and driveline
Electrical, wiring and power
Engine
Exhaust and emissions
1Hydro-boost brake assist and power steering share one hydraulic supply (four campaigns)0Buzz at the accelerator pedal on the first acceleration after start (Supplemental Brake Assist self-test, normal)0Parking brake linings worn out prematurely, parking brake does not hold (PBR single-shoe drum-in-hat)1500 only0Rattle from the center of the dash (cowl insulator clip)0Snap or popping noise from the front of the vehicle (slot the front crossmember mounting holes)0Headliner or roof rattle (roof drain channel)0Side access door noise (door check link replacement)04L60-E / 4L65-E clunk on 2-3 upshift or 3-2 downshift (normal condition)04L80-E / 4L85-E planetary gear whine in first and second gear0Grind / ratchet noise when shifting into Park in 4LO (characteristic)0Generator whine in the audio system (new ground for radio and amplifier)0Hum or fan noise from the navigation radio (internal cooling fan, normal)0Accessory drive belt whine (power steering pump pulley repositioned)1500 only0Engine vibration or noise at idle felt in the steering wheel or seat (reprogram the PCM)0Single-cylinder misfire (P0300-P0308) and/or chirp, squeak or tick at camshaft speed: worn cam lobe / lifter, valve or valve spring0Oil pump pickup (screen) O-ring cut: engine tick / lifter noise4.8L, 5.3L, 6.0L only0Rear bank knock sensor corrosion from water intrusion (P0332)4.8L, 5.3L, 6.0L only0Exhaust pop or ping noise (replace the heat shield, not the exhaust system)
11 causes not drawn

The documents say what to doOnly records name itThe size of a node, the width of a link and the numbers are records matching this search, not likelihoods.

FaultCrate・GMC Yukon 2000–2006・Noise

Candidate cause (the documents say what to do)

Hydro-boost brake assist and power steering share one hydraulic supply (four campaigns)

Some vehicles were built with an out-of-specification hydro-boost housing relief valve bore.

The hydraulic brake booster pressure accumulator may crack and separate from the hydro-boost assembly during normal operating conditions.

What to do

  1. Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.
  2. To tell whether a 670 gear box is fitted, inspect the mounting bolts that attach the stub shaft housing; a 670 gear box has only 3 mounting bolts.
  3. The PI document instructed technicians to diagnose the vehicle using the Power Steering Test Procedures if an owner complained about difficulty steering during "parking lot type maneuvers"; if the vehicle passed this test, no work was required, as GM viewed this as a normal phenomenon.
  4. Dealers replace the hydro-boost relief valve.
  5. Dealers test the hydro-boost assembly for functional operation and replace it if it fails.
  6. Dealers replace the hydraulic pump.
Read the remaining 7 steps

Caution: An inoperative pump raises steering and braking effort but does not completely remove the ability to steer or slow the vehicle.

What is needed

Parts and materials
  • Hydro-boost relief valve
  • Hydro-boost assembly (if it fails the functional test)
  • Hydraulic pump
  • Power steering hoses (those with a suspect date code)
  • Power Steering Gear 88965542, Union Fitting 26025709, Inlet O-ring Seal 26001594 (C/K 1500 series only)
  • Replacement pressure control valve PN 26095470 (available, if the customer's situation warrants, to provide additional steering assist)

Part numbers printed in the document

The numbers are as the document prints them. The name and the replacing number are what the pages of GMPartsGiant, a reseller of genuine parts and not GM, state. Aftermarket equivalents are not checked here (the links only search by number). Confirm the fit for the vehicle (VIN) before ordering.

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.

In the records

  • Hydro-Boost Relief Valve: replaced 1
See the evidence (2 technical documents, 1 records)

Passages of the technical documents

  • Some vehicles were built with an out-of-specification hydro-boost housing relief valve bore.

    SOME OF THESE VEHICLES WERE PRODUCED WITH AN OUT-OF-SPECIFICATION BRAKE HYDRO-BOOST HOUSING RELIEF VALVE BORE.

    NHTSA (recall summary text as published by NHTSA)

  • The valve O-ring seal may fracture, and steering effort may be slightly higher while braking or parking.

    CONSEQUENTLY, THE VALVE O-RING SEAL MAY FRACTURE. STEERING EFFORTS MAY BE SLIGHTLY INCREASED WHILE BRAKING OR PARKING.

    NHTSA (recall summary text as published by NHTSA)

  • Dealers replace the hydro-boost relief valve.

    DEALERS ARE TO REPLACE THE HYDRO-BOOST RELIEF VALVE.

    NHTSA (recall summary text as published by NHTSA)

  • The hydraulic brake booster pressure accumulator may crack and separate from the hydro-boost assembly during normal operating conditions.

    THE HYDRAULIC BRAKE BOOSTER PRESSURE ACCUMULATOR MAY CRACK AND SEPARATE FROM THE HYDRO-BOOST ASSEMBLY DURING NORMAL OPERATING CONDITIONS.

    NHTSA (recall summary text as published by NHTSA)

Read every statement and its source →

Manufacturer’s documents

Records

None among the records that can be opened now.

See all 1 records of this cause →

A cause or a result a complaint states is the owner’s view or what a dealer told them, not an established fact.

Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.