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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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A record is under an engine, a drive or a series only where it says so: the characters of the vehicle identification number filed with a complaint, its text, or what its document says it applies to. A record that does not say is kept as "not stated". The filed numbers and the documents do not tell 4WD from AWD.

Common on this vehicle:Leak

issueCastech cylinder head porosity crack (gradual coolant loss)Remove

Record by record

5 records state a cause or a remedy. Each record is shown as short labels in the order fault → finding the cause → correction. Press a label to narrow to the records that state it.

Symptom

Component named as the cause

Work done

How it is said to have ended

  • says it came back2
  • result not stated1

A ribbon is as wide as the records that state both of its ends (only the commonest are drawn). A record that names several symptoms or components runs through each. Orange is records that say the fault came back or was not fixed. Results come from owners’ reports only; one that does not say is “result not stated”. None of this is a likelihood of a cause or a rate at which work succeeds.

Read the records one by one (5)

Known issuesCastech cylinder head porosity crack (gradual coolant loss)5

  1. Owner complaint2004 GMC YUKON ・ 2013-09-03

    Slug buildup, oil pressure loss, and coolant loss

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

    Read the sentences of the record
    Fault
    MY CAR BEGAN TO HAVE A BUILD UP OF SLUGS AND BEGAN LOOSING OIL PRESSURE AND COOLANT AND NEEDED OIL ADDED AND COOLANT FREQUENTLY.
    Cause
    I WAS ADVISED TO CHANGE THE OIL FREQUENTLY TO CLEAN THE SLUG OUT BUT IT CONTINUED TO BUILD UP AND THE MYSTERY OF LOOSING COOLANT OIL PRESSURE HAS BOTTOMED OUT TWO MORE TIMES AND I FOUND A ARTICLE ON THE INTERNET THAT A NUMBER OF GMC VEHICLES INCLUDING MINE WERE BUILT WITH DEFECTIVE CYLINDER HEADS DUE TO CRACKS OVER TIME WHICH ALLOWS COOLANT TO LEAK INTO ENGINE AND MIX WITH THE OIL WHICH BUILDS UP SLUG.
    Remedy
    THE SLUGS WERE CLEANED AND A NEW OIL PUMP WAS PLACED BECAUSE OF THE BUILD UP OF SLUGS.

  2. Manufacturer communication2001–2006 GMC YUKON DENALI ・ 2024-03-19

    Internal Coolant Leak from Cylinder Head Location

    1. 1Fault

      • Some vehicles may experience a gradual coolant loss over time.

    2. 2Finding the cause

      Possible causes

      • A very low percentage of cylinder heads manufactured with an embossed Castech logo may develop a porosity crack in a very specific area.

      Steps to confirm (in the document’s order)

      1. Check whether the head is a Castech casting by looking for the casting logo on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head.
      2. If the head is a Castech casting, inspect the area around the five oil drain holes for witness marks indicating coolant seepage over time.
      3. The crack can be in any of the five cylinder head oil drains and shows as a clean or shiny area on an otherwise stained surface.
      4. Pressurizing the cooling system at this time may reveal coolant, air, or a combination weeping in the described area.

    3. 3Correction

      Repair

      • If inspection reveals evidence of coolant witness marks, replace the entire cylinder head assembly.

      Caution

      • If the cylinder heads are not a Castech casting, follow normal diagnostic procedures in SI to determine the cause of the coolant loss.
      • If no evidence of coolant loss is found on inspection of Castech casting cylinder heads, follow normal diagnostic procedures in SI to determine the cause of the coolant loss.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to 2001-2006 GMC Envoy, Jimmy, Sierra and Yukon models, among other listed GM models, with the 4.8L, 5.3L or 5.7L VORTEC GEN III, GEN IV V8 engine.
    • Condition：Some vehicles may experience a gradual coolant loss over time.
    • Cause：A very low percentage of cylinder heads manufactured with an embossed Castech logo may develop a porosity crack in a very specific area.
    • Confirm：Check whether the head is a Castech casting by looking for the casting logo on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head.
    • Confirm：If the head is a Castech casting, inspect the area around the five oil drain holes for witness marks indicating coolant seepage over time.
    • Confirm：The crack can be in any of the five cylinder head oil drains and shows as a clean or shiny area on an otherwise stained surface.
    • Confirm：Pressurizing the cooling system at this time may reveal coolant, air, or a combination weeping in the described area.
    • Repair：If inspection reveals evidence of coolant witness marks, replace the entire cylinder head assembly.
    • Caution：If the cylinder heads are not a Castech casting, follow normal diagnostic procedures in SI to determine the cause of the coolant loss.
    • Caution：If no evidence of coolant loss is found on inspection of Castech casting cylinder heads, follow normal diagnostic procedures in SI to determine the cause of the coolant loss.

    Open the manufacturer’s document (PDF) ↗ The points above were read from this document.

    Remedy
    This bulletin advises the technician of possible location of an internal coolant leak from a specific cylinder head and location.

  3. Owner complaint2004 GMC YUKON ・ 2016-07-18

    Engine losing coolant with no apparent external leakage

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

      Not stated

      What the documents say to do

      Castech cylinder head porosity crack (gradual coolant loss)

      Confirm

      • Inspect the cylinder head to determine whether the casting was made by Castech.

      Repair

      • If coolant witness marks are found, replace the entire cylinder head assembly.

      Caution

      • If the heads are not Castech castings, follow normal diagnostic procedures to find the cause of the coolant loss.
    Read the sentences of the record
    Fault
    ENGINE LOSING COOLANT, WITH NO APPARENT SIGNS OF LEAKAGE.
    Cause
    COOLANT APPEARS TO BE LEAKING INTO THE ENGINE OIL, CAUSING IT TO SLUDGE, THEREBY CAUSING ENGINE FAILURE.

  4. Owner complaint2004 GMC YUKON ・ 2015-01-03

    Coolant drain into engine block from faulty cylinder head

    1. 1Fault

      Not stated

    2. 2Finding the cause

    3. 3Correction

      Not stated

      What the documents say to do

      Castech cylinder head porosity crack (gradual coolant loss)

      Confirm

      • Inspect the cylinder head to determine whether the casting was made by Castech.

      Repair

      • If coolant witness marks are found, replace the entire cylinder head assembly.

      Caution

      • If the heads are not Castech castings, follow normal diagnostic procedures to find the cause of the coolant loss.
    Read the sentences of the record
    Cause
    FAULTY CASTECH HEAD CAUSED COOLANT FLUID TO DRAIN INTO BLOCK THEREFORE DESTROYING MOTOR.

  5. Owner complaint2006 GMC YUKON ・ 2013-09-13

    5.3L GM engine camshaft delamination and engine replacement

    1. 1Fault

      28 AUGUST MY WIFE TOLD ME THE ENGINE WAS NOISY.

    2. 2Finding the cause

    3. 3Correction

    Read the sentences of the record
    Fault
    28 AUGUST MY WIFE TOLD ME THE ENGINE WAS NOISY.
    Cause
    IN DECEMBER 2010 THE CAMSHAFT IN THE 5.3L GM ENGINE REPORTEDLY DELAMINATED CAUSING ONE OR MORE LIFTERS TO GALL AND FAIL REQUIRING A NEW ENGINE.
    Inspection
    ON 30 AUGUST THEY CONCLUDED THAT THE ENGINE NEEDED TO BE REPLACED.