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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 fireWarning light

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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.

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 (4)

ENGINE AND ENGINE COOLING4

  1. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2022-09-07

    MIL Illuminated with Fuel Trim and Oxygen Sensor Codes

    1. 1Fault

      • Customers may comment that the MIL is illuminated.
      • Initial diagnosis may show fuel trim and O2 sensor related codes including P0101, P0137, P0138, P0140, P0141, P0157, P0158, P0160 and P0161.
      • The listed codes also include P0171, P0174, P0420, P0430, P1174 and P1175.

    2. 2Finding the cause

      Possible causes

      • These methods find small leaks around the O2 sensor embossments and slight cracks in an intake plenum or gasket.

      Steps to confirm (in the document’s order)

      1. If normal SI diagnostics do not lead to a resolution and an intake vacuum leak or exhaust leak is suspected, use the GE-52250 Variable Pressure Leak Detector (preferred), the J-41416 ultrasonic leak tester, or possibly soapy water with low pressure air into the tailpipe to find the leak.
      2. For an intake leak, introduce the smoke into the brake booster hose or the oil dipstick tube; soapy water can be sprayed near the gasket, seams and all vacuum nipples.
      3. For an exhaust leak, put the hose with smoke or air into the tailpipe sealed with shop towels, then spray soapy water around seals, seams and bosses.

    3. 3Correction

      Parts

      • No parts are required for this repair.

      Caution

      • All of these tests are much more effective if the throttle body is covered or sealed.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to Buick, Cadillac, Chevrolet and GMC passenger cars and trucks, model years 2000 to 2022, gasoline engines only.
    • Condition：Customers may comment that the MIL is illuminated.
    • Condition：Initial diagnosis may show fuel trim and O2 sensor related codes including P0101, P0137, P0138, P0140, P0141, P0157, P0158, P0160 and P0161.
    • Condition：The listed codes also include P0171, P0174, P0420, P0430, P1174 and P1175.
    • Confirm：If normal SI diagnostics do not lead to a resolution and an intake vacuum leak or exhaust leak is suspected, use the GE-52250 Variable Pressure Leak Detector (preferred), the J-41416 ultrasonic leak tester, or possibly soapy water with low pressure air into the tailpipe to find the leak.
    • Caution：All of these tests are much more effective if the throttle body is covered or sealed.
    • Confirm：For an intake leak, introduce the smoke into the brake booster hose or the oil dipstick tube; soapy water can be sprayed near the gasket, seams and all vacuum nipples.
    • Confirm：For an exhaust leak, put the hose with smoke or air into the tailpipe sealed with shop towels, then spray soapy water around seals, seams and bosses.
    • Cause：These methods find small leaks around the O2 sensor embossments and slight cracks in an intake plenum or gasket.
    • Parts：No parts are required for this repair.

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

    Remedy
    This bulletin provides information on tools available to find an intake vacuum leak or exhaust leak to correct a condition of MIL Illuminated with Multiple Fuel Trim and/or Oxygen Sensor Codes Set.

  2. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2019-03-18

    Diagnostic Tip: Using Smoke Machine and Ultrasonic Detector for Air Leaks

    1. 1Fault

      • The SES light is on, and initial diagnosis may show fuel trim and/or O2 sensor related codes such as P0171, P0174, P0420 and P0430.

    2. 2Finding the cause

      Steps to confirm (in the document’s order)

      1. If normal SI diagnostics do not resolve it and an intake vacuum leak or exhaust leak is suspected, the J41413-200 Evaporative System Tester smoke machine, the J-41416 ultrasonic leak tester, or soapy water with low pressure air into the tailpipe may help find the leak.
      2. For an intake leak, the smoke can be introduced into the brake booster hose or the oil dipstick tube.
      3. Soapy water can be sprayed near the gasket and seams and on all vacuum nipples.
      4. For an exhaust leak, a hose into the tailpipe carrying smoke or air, sealed with shop towels, is effective.
      5. Then spray soapy water around the seals, seams and bosses.
      1 more points

    3. 3Correction

      Caution

      • All of these tests are much more effective if the throttle body is covered/sealed.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to all 2000 - 2019 models with gasoline engines.
    • Condition：The SES light is on, and initial diagnosis may show fuel trim and/or O2 sensor related codes such as P0171, P0174, P0420 and P0430.
    • Confirm：If normal SI diagnostics do not resolve it and an intake vacuum leak or exhaust leak is suspected, the J41413-200 Evaporative System Tester smoke machine, the J-41416 ultrasonic leak tester, or soapy water with low pressure air into the tailpipe may help find the leak.
    • Caution：All of these tests are much more effective if the throttle body is covered/sealed.
    • Confirm：For an intake leak, the smoke can be introduced into the brake booster hose or the oil dipstick tube.
    • Confirm：Soapy water can be sprayed near the gasket and seams and on all vacuum nipples.
    • Confirm：For an exhaust leak, a hose into the tailpipe carrying smoke or air, sealed with shop towels, is effective.
    • Confirm：Then spray soapy water around the seals, seams and bosses.
    • Confirm：These methods are very good for finding small leaks around the O2 sensor bosses and slight cracks in an intake plenum or gasket.

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

    Remedy
    This preliminary information document communicates a tip on the way to diagnose possible induction or exhaust air leaks using the evaporative emission cart smoke machine and ultrasonic leak detector tools.

  3. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2018-05-07(3 earlier editions of this document folded here)

    Premature Catalytic Converter Failures – Preliminary Information

    1. 1Fault

      • The catalytic converter has come apart or has set P0420 and/or P0430.

    2. 2Finding the cause

      Steps to confirm (in the document’s order)

      1. If the converter has failed with no apparent reason, inspect for a poor crimp at the circuit terminal on the engine bank with the concern.
      2. The grounds in question are those for the ignition system, fuel injector or the ECM.
      3. Inspect the ground for corrosion or damage at the ground terminal ring, fasteners and grounding surfaces.

    3. 3Correction

      Repair

      • If no corrosion or damage is found, tighten the ground bolt to the proper torque.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to 2015 and prior GM cars and gasoline-powered light duty and HD trucks.
    • Condition：The catalytic converter has come apart or has set P0420 and/or P0430.
    • Confirm：If the converter has failed with no apparent reason, inspect for a poor crimp at the circuit terminal on the engine bank with the concern.
    • Confirm：The grounds in question are those for the ignition system, fuel injector or the ECM.
    • Confirm：Inspect the ground for corrosion or damage at the ground terminal ring, fasteners and grounding surfaces.
    • Repair：If no corrosion or damage is found, tighten the ground bolt to the proper torque.

    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 gasoline powered cars, mid-size trucks, light duty trucks, and heavy duty trucks with premature catalytic converter failures. It is recommended to inspect for a poor crimp on the grounds ring terminal at the engine block for the bank with the concern and repair the wire.

  4. Manufacturer communication2000–2005 GMC YUKON ・ 2004-11-05

    P0420 and P0430 DTCs in Gen III V-8 engines

    1. 1Fault

    2. 2Finding the cause

      Not stated

    3. 3Correction

      P0420 AND P0430 DTSC IN THE DETROIT, MICHIGAN AREA WITH GEN III V-8 ENGINES. *SC

    Read the sentences of the record
    Remedy
    P0420 AND P0430 DTSC IN THE DETROIT, MICHIGAN AREA WITH GEN III V-8 ENGINES. *SC

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