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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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2 conditions added

Common on this vehicle:Misfire or rough idleWarning lightNoiseLeakHard start or long crankDoes not start

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12 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

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 issuesSingle-cylinder misfire (P0300-P0308) and/or chirp, squeak or tick at camshaft speed: worn cam lobe / lifter, valve or valve spring2

  1. 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.

  2. 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.

ENGINE2

  1. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2024-07-16(1 earlier editions of this document folded here)

    Fuel Injection Cleaner Kit Service Bulletin

    1. 1Fault

      • Rough idle, crank no start, extended crank or misfire, with the engine warning lamp on and DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308 set.
      • When the engine is cold, compression on multiple cylinders may be zero.
      • The engine may pop through the intake or exhaust while cranking, and the spark plugs may be fuel fouled.

    2. 2Finding the cause

      Possible causes

      • Major carbon build-up on the intake and/or exhaust valves from fuel contamination or incomplete burning of the fuel; misfires should not appear before at least 8,000 km (5,000 mi).

    3. 3Correction

      Repair

      1. If there is no valve damage and no cam follower out of place, perform the cleaning procedure to free sticking valves and remove carbon from the valves and pistons.
      2. If valves are damaged or cam followers are out of place, make the engine mechanical repairs first and then perform the cleaning procedure to prevent a return.
      3. Fill Cleaner Kit J-35800-A with about 650 ml (22 oz, 2 cans) of Air Intake, Combustion Chamber Cleaner and set the air pressure at the tool to 260 kPa (40 psi).
      4. With GDS 2 or a scan tool, command engine idle to 2000 rpm so the engine does not stall.
      5. With the engine at operating temperature in a well-ventilated area, slowly and carefully induce the cleaner into the engine, taking about 3 minutes.

      Parts

      • The Top Engine Cleaning Kit (ACDelco Air Intake, Valve and Combustion Chamber Cleaner and ACDelco Fuel System Cleaner 44K) is 19435372 for the U.S. and Canada.

      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.

      Caution

      • Inducing too much cleaner at too low an RPM, or stalling the engine with too much cleaner at once, may hydro-lock the engine and bend a connecting rod.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to GM passenger cars and trucks with gasoline engines only, model years 2000 to 2025.
    • Condition：Rough idle, crank no start, extended crank or misfire, with the engine warning lamp on and DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308 set.
    • Condition：When the engine is cold, compression on multiple cylinders may be zero.
    • Condition：The engine may pop through the intake or exhaust while cranking, and the spark plugs may be fuel fouled.
    • Cause：Major carbon build-up on the intake and/or exhaust valves from fuel contamination or incomplete burning of the fuel; misfires should not appear before at least 8,000 km (5,000 mi).
    • Repair：If there is no valve damage and no cam follower out of place, perform the cleaning procedure to free sticking valves and remove carbon from the valves and pistons.
    • Repair：If valves are damaged or cam followers are out of place, make the engine mechanical repairs first and then perform the cleaning procedure to prevent a return.
    • Caution：Inducing too much cleaner at too low an RPM, or stalling the engine with too much cleaner at once, may hydro-lock the engine and bend a connecting rod.
    • Repair：Fill Cleaner Kit J-35800-A with about 650 ml (22 oz, 2 cans) of Air Intake, Combustion Chamber Cleaner and set the air pressure at the tool to 260 kPa (40 psi).
    • Repair：With GDS 2 or a scan tool, command engine idle to 2000 rpm so the engine does not stall.
    • Repair：With the engine at operating temperature in a well-ventilated area, slowly and carefully induce the cleaner into the engine, taking about 3 minutes.
    • Parts：The Top Engine Cleaning Kit (ACDelco Air Intake, Valve and Combustion Chamber Cleaner and ACDelco Fuel System Cleaner 44K) is 19435372 for the U.S. and Canada.

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

    Remedy
    This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.

  2. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2017-08-15(1 earlier editions of this document folded here)

    Engine Misfire and Rough Idle Malfunction Indicator Lamp

    1. 1Fault

      • Customers may complain of a MIL and/or engine misfire, rough idle, extended crank, or crank no start.
      • One or more misfire codes (DTC P0300-P0308) are found stored in the ECM.

    2. 2Finding the cause

      Possible causes

      • The condition may result from major carbon build up on the intake and/or exhaust valves due to fuel contamination or incomplete burning of the fuel.

      Steps to confirm (in the document’s order)

      1. With the engine cold, compression on multiple cylinders may read 0 PSI (= 0 kPa).
      2. The engine may pop through the intake or exhaust while cranking, and the spark plugs may be fuel fouled.

    3. 3Correction

      Repair

      1. If there is valve damage or cam followers are out of place, make the mechanical repairs first, then perform the cleaning procedure to keep the concern from returning.
      2. With the engine at operating temperature, slowly induce a bottle of GM Upper Engine and Fuel Injection Cleaner with RPM held above idle so the engine does not stall (typically around 2,000 RPM).
      3. Turn the engine off and let the cleaner soak for 2.5 to 3 hours.
      4. To complete the repair, change the engine oil and filter.

      Parts

      • Upper Engine and Fuel Injector Cleaner is P/N 88861803 (in Canada, P/N 88861804).

      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.

      Caution

      • Inducing too much cleaner at too low an RPM, or stalling the engine with cleaner, may hydro-lock the engine and bend a connecting rod.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to all 2000-2015 light duty trucks with gasoline engines.
    • Condition：Customers may complain of a MIL and/or engine misfire, rough idle, extended crank, or crank no start.
    • Condition：One or more misfire codes (DTC P0300-P0308) are found stored in the ECM.
    • Cause：The condition may result from major carbon build up on the intake and/or exhaust valves due to fuel contamination or incomplete burning of the fuel.
    • Confirm：With the engine cold, compression on multiple cylinders may read 0 PSI (= 0 kPa).
    • Confirm：The engine may pop through the intake or exhaust while cranking, and the spark plugs may be fuel fouled.
    • Repair：If there is valve damage or cam followers are out of place, make the mechanical repairs first, then perform the cleaning procedure to keep the concern from returning.
    • Repair：With the engine at operating temperature, slowly induce a bottle of GM Upper Engine and Fuel Injection Cleaner with RPM held above idle so the engine does not stall (typically around 2,000 RPM).
    • Repair：Turn the engine off and let the cleaner soak for 2.5 to 3 hours.
    • Repair：To complete the repair, change the engine oil and filter.
    • Caution：Inducing too much cleaner at too low an RPM, or stalling the engine with cleaner, may hydro-lock the engine and bend a connecting rod.
    • Parts：Upper Engine and Fuel Injector Cleaner is P/N 88861803 (in Canada, P/N 88861804).

    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 Malfunction Indicator Lamp on or engine misfire, rough idle, extended crank, or crank no start in some cases. Technician will need to perform published Service Information diagnostics. If technician finds carbon an upper engine and valve cleaning should be performed.

ENGINE AND ENGINE COOLING1

  1. Manufacturer communication2002–2006 GMC YUKON DENALI ・ 2023-04-13(1 earlier editions of this document folded here)

    Diagnostic tip on valve, lifter or camshaft issues

    1. 1Fault

      • Misfire, chirp, squeak, squeal or tick noise, with the MIL illuminated and DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 set.

    2. 2Finding the cause

      Possible causes

      • A worn cam lobe on this engine family generally creates a consistent chirp, squeak, squeal or tick at camshaft speed and/or a misfire with a P0300-P0308 DTC.

      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 a rocker changes the noise, a lifter and/or cam lobe concern on that cylinder is most likely.
      3. Measure cam lobe lift at the push rod side of the rocker arm; it differs from the SI specification but should be similar to the other rockers on the same bank.
      4. A bore scope or pen light helps when inspecting the cam lobes through the lifter bores; a damaged lobe is easy to overlook.
      5. A good indicator of a sticking valve is that misfires continue to count on an aggressive deceleration with engine braking.
      2 more points

    3. 3Correction

      Repair

      1. If a worn camshaft lobe or lifter roller is found, replace the camshaft and all lifters following SI procedures.
      2. If force is needed to tap the valve off its seat, excessive carbon build up exists, which may be repaired by decarbonizing the engine.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：GM passenger cars and trucks with V6/V8 pushrod engines, model years 2002 to 2023.
    • Condition：Misfire, chirp, squeak, squeal or tick noise, with the MIL illuminated and DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 set.
    • Confirm：A verified noise is not eliminated by canceling fuel injectors and occurs at camshaft speed (half of crankshaft speed).
    • Cause：A worn cam lobe on this engine family generally creates a consistent chirp, squeak, squeal or tick at camshaft speed and/or a misfire with a P0300-P0308 DTC.
    • Confirm：If applying pressure to the valve side of a rocker changes the noise, a lifter and/or cam lobe concern on that cylinder is most likely.
    • Confirm：Measure cam lobe lift at the push rod side of the rocker arm; it differs from the SI specification but should be similar to the other rockers on the same bank.
    • Confirm：A bore scope or pen light helps when inspecting the cam lobes through the lifter bores; a damaged lobe is easy to overlook.
    • Repair：If a worn camshaft lobe or lifter roller is found, replace the camshaft and all lifters following SI procedures.
    • Confirm：A good indicator of a sticking valve is that misfires continue to count on an aggressive deceleration with engine braking.
    • Repair：If force is needed to tap the valve off its seat, excessive carbon build up exists, which may be repaired by decarbonizing the engine.
    • Confirm：Valve leakage is typically isolated by the Cylinder Leakage Test in SI, which finds excessive leakage past an intake or exhaust valve compared with the others.
    • Confirm：The two pieces of a broken valve spring may stay stacked together and be hard to see; lightly pushing on different places on the springs with a small hammer handle may help.

    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.

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