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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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Common on this vehicle:NoiseWarning lightLeak

issueSingle-cylinder misfire (P0300-P0308) and/or chirp, squeak or tick at camshaft speed: worn cam lobe / lifter, valve or valve springRemove

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7 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

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 (3)

Known issuesSingle-cylinder misfire (P0300-P0308) and/or chirp, squeak or tick at camshaft speed: worn cam lobe / lifter, valve or valve spring3

  1. Manufacturer communication2002–2006 GMC YUKON DENALI ・ 2023-05-06

    Diagnostic tip: valve, lifter or camshaft issue

    1. 1Fault

      • Misfire, chirp, squeak, squeal or tick noise, or MIL illuminated.
      • DTCs P0300 (engine misfire detected) and P0301 through P0308 (misfire detected on cylinders 1 through 8) are listed.

    2. 2Finding the cause

      Possible causes

      • Possible causes: worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, or a collapsed AFM lifter.

      Steps to confirm (in the document’s order)

      1. A verified noise is not eliminated by canceling fuel injectors and occurs at camshaft speed (half of crankshaft speed).
      2. If applying pressure to the valve side of the rocker changes the noise, a lifter and/or cam lobe concern on that cylinder is most likely.
      3. Disconnect the coils and injectors on one bank, run the engine with that valve cover removed, back off the rocker arm a couple of turns and listen for a change in the noise.
      4. Measure cam lobe lift at the pushrod side of the rocker arm and compare with other rockers on the same bank; the misfiring or ticking cylinder should have clearly less lift.
      5. A good indicator of a sticking valve is misfires that keep counting on an aggressive deceleration with engine braking.
      1 more points

    3. 3Correction

      Repair

      • If a worn camshaft lobe or lifter roller is found, replace the camshaft and all lifters, and the plastic lifter guide for the affected lifter.

      Caution

      • A damaged cam lobe is easy to overlook through the lifter bores, and unworn lifter rollers do not mean the cam lobes are okay; inspect both carefully.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to GM passenger cars and trucks, 2002 through 2023, with V6/V8 pushrod engines.
    • Condition：Misfire, chirp, squeak, squeal or tick noise, or MIL illuminated.
    • Condition：DTCs P0300 (engine misfire detected) and P0301 through P0308 (misfire detected on cylinders 1 through 8) are listed.
    • Confirm：A verified noise is not eliminated by canceling fuel injectors and occurs at camshaft speed (half of crankshaft speed).
    • Cause：Possible causes: worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, or a collapsed AFM lifter.
    • Confirm：If applying pressure to the valve side of the rocker changes the noise, a lifter and/or cam lobe concern on that cylinder is most likely.
    • Confirm：Disconnect the coils and injectors on one bank, run the engine with that valve cover removed, back off the rocker arm a couple of turns and listen for a change in the noise.
    • Confirm：Measure cam lobe lift at the pushrod side of the rocker arm and compare with other rockers on the same bank; the misfiring or ticking cylinder should have clearly less lift.
    • Caution：A damaged cam lobe is easy to overlook through the lifter bores, and unworn lifter rollers do not mean the cam lobes are okay; inspect both carefully.
    • Repair：If a worn camshaft lobe or lifter roller is found, replace the camshaft and all lifters, and the plastic lifter guide for the affected lifter.
    • Confirm：A good indicator of a sticking valve is misfires that keep counting on an aggressive deceleration with engine braking.
    • Confirm：A broken valve spring may stay stacked together and be hard to see; lightly push on different places on the springs with a small hammer handle.

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

    Remedy
    This diagnostic tip bulletin provides additional information on how to diagnose a possible valve, lifter or camshaft issue.

  2. Manufacturer communication2002–2006 GMC YUKON DENALI ・ 2018-11-13(4 earlier editions of this document folded here)

    Service Engine Soon Lamp, Misfire, Engine Noise Diagnostic Information

    1. 1Fault

      • Customers may complain of an SES light, engine misfire, and/or engine noise.
      • If the SES light is on, there will be a P0300-P0308 DTC with misfires counting on a single cylinder, which may or may not be felt.
      • A verified noise is not eliminated by canceling fuel injectors and occurs at camshaft speed (half of crankshaft speed).

    2. 2Finding the cause

      Possible causes

      • If SI diagnosis does not isolate the cause, it may be a worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, or a collapsed AFM (Active Fuel Management) lifter.

      Steps to confirm (in the document’s order)

      1. During the noise, press with a wooden hammer handle on the rocker arms at the valve side, push rod side, and side of the rocker to find which one is making noise.
      2. If pressure on the valve side of the rocker changes the noise, it is most likely a lifter and/or cam lobe concern on that cylinder.
      3. Measure the cam lobe lift at the push rod side of the rocker arm.
      4. A good indicator of a sticking valve is engine misfires that continue to count on an aggressive deceleration with engine braking.
      5. Release the air pressure from the cylinder and work the valve up and down in the guide while turning it 360 degrees; if any binding is felt, a stem to guide clearance concern exists.
      1 more points

    3. 3Correction

      Repair

      1. If a worn camshaft lobe or lifter roller is found, follow SI procedures to replace the camshaft and all lifters.
      2. Also replace the plastic lifter guide for the lifter that had the damaged cam lobe and/or lifter roller.
      3. Refer to the latest version of PIP4753 for decarboning instructions.
      4. If a broken valve spring is found, replace the broken valve spring as necessary.

      Caution

      • If an AFM lifter concern is suspected, refer to the latest version of PIP4568 for additional information.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to GMC Yukon models, 2002 - 2018, with a V8 engine.
    • Condition：Customers may complain of an SES light, engine misfire, and/or engine noise.
    • Condition：If the SES light is on, there will be a P0300-P0308 DTC with misfires counting on a single cylinder, which may or may not be felt.
    • Condition：A verified noise is not eliminated by canceling fuel injectors and occurs at camshaft speed (half of crankshaft speed).
    • Cause：If SI diagnosis does not isolate the cause, it may be a worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, or a collapsed AFM (Active Fuel Management) lifter.
    • Confirm：During the noise, press with a wooden hammer handle on the rocker arms at the valve side, push rod side, and side of the rocker to find which one is making noise.
    • Confirm：If pressure on the valve side of the rocker changes the noise, it is most likely a lifter and/or cam lobe concern on that cylinder.
    • Confirm：Measure the cam lobe lift at the push rod side of the rocker arm.
    • Repair：If a worn camshaft lobe or lifter roller is found, follow SI procedures to replace the camshaft and all lifters.
    • Repair：Also replace the plastic lifter guide for the lifter that had the damaged cam lobe and/or lifter roller.
    • Confirm：A good indicator of a sticking valve is engine misfires that continue to count on an aggressive deceleration with engine braking.
    • Confirm：Release the air pressure from the cylinder and work the valve up and down in the guide while turning it 360 degrees; if any binding is felt, a stem to guide clearance concern exists.
    • Repair：Refer to the latest version of PIP4753 for decarboning instructions.
    • Confirm：Typically, the Cylinder Leakage Test outlined in SI should isolate valve leakage.
    • Repair：If a broken valve spring is found, replace the broken valve spring as necessary.
    • Caution：If an AFM lifter concern is suspected, refer to the latest version of PIP4568 for additional information.

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

    Remedy
    This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on, engine misfire, and/or engine noise. Technician may find Diagnostic Trouble Codes P0300-P0308. If published Service Information diagnostics does not isolate the cause of this concern technician should check for a worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, and a collapsed active fuel management lifter.

  3. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2017-08-15

    Service Engine Soon Lamp and Engine Misfire Information

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

      This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on, engine misfire, and/or engine noise. Technician may find Diagnostic Trouble Codes P0300-P0308. If published Service Information diagnostics does not isolate the cause of this concern technician should check for a worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, and a collapsed active fuel management lifter.

      What the documents say to do

      Single-cylinder misfire (P0300-P0308) and/or chirp, squeak or tick at camshaft speed: worn cam lobe / lifter, valve or valve spring

      Confirm

      • If pressing on the valve side of the rocker changes the noise, a lifter and/or cam lobe concern on that cylinder is most likely.

      Repair

      1. If a worn camshaft lobe or lifter roller is found, follow SI procedures to replace the camshaft and all lifters.
      2. Also replace the plastic lifter guide for the lifter that had the damaged cam lobe and/or lifter roller.

      Caution

      • A damaged cam lobe is easy to overlook when inspecting through the lifter bores; unworn lifter rollers do not mean the cam lobes are okay.
    Read the sentences of the record

    Open the manufacturer’s document (PDF) ↗ What is shown here is NHTSA’s summary; the procedure is in the document itself.

    Remedy
    This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on, engine misfire, and/or engine noise. Technician may find Diagnostic Trouble Codes P0300-P0308. If published Service Information diagnostics does not isolate the cause of this concern technician should check for a worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, and a collapsed active fuel management lifter.

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