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Selected vehicle: 2006 · GMC Yukon XL Denali

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Source reference 10236164

Manufacturer communication — 2006 GMC YUKON

ReferenceReporter type: ManufacturerENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)

Relation to the target vehicle

  • The source's vehicle field says Yukon; whether it is an XL is not stated.
  • The trim (Denali) is not stated.
Model year
Match 2006 — Source vehicle field
Model
Unknown YUKON — Source vehicle field
Trim
Unknown

What the manufacturer’s document says

PIP5628F ・ fault and correction ・ for GM vehicles in general

Applies to

  • Applies to all 2000 - 2023 models.

    the passage
    All All 2000 - 2023 All All All All

Fault

  • On a vehicle with DTC P0300 - P0308 and/or P050D, save the freeze frame records with GDS.

    the passage
    If you encounter a vehicle with DTC P0300 - P0308 and/or P050D use GDS and save the freeze frame records.

Finding the cause

Steps to confirm (in the document’s order)

  1. Perform the relative compression test within the PICO NVH or oscilloscope software; SI Document number 5518386 describes the procedure.

    the passage
    Perform the relative compression test within the PICO NVH or Oscilloscope software, SI Document number 5518386 can be referenced for this procedure.

  2. If the relative compression test fails, do a cylinder leakage test and note where it leaks (intake, exhaust, crankcase); with no leak, look into valve train problems or a bent connecting rod.

    the passage
    If it fails do a cylinder leakage test, was a leak observed? – and if so, where (intak e, exhaust, crankcase) – if you didn’t have a leak, than explore for valve train issues or the possibility of a bent connecting rod

  3. If it passes the relative compression test, the problem is in ignition or fuel delivery.

    the passage
    If it passes the relative test, you’re dealing with an ignition or a fuel delivery issue etc.

  4. Check the ignition supply voltage to the ignition module/coil assemblies and also to the fuel injectors.

    the passage
    Check the supply ignition voltage to the ignition module/coil assemblies, and also to the fuel injectors

  5. Inspect the spark plugs for anything abnormal.

    the passage
    Complete a Spark plug inspection ( inspect for anything abnormal)

  6. Note the fuel trim values and on which bank, and compare actual MAF against calculated air flow.

    the passage
    Note the fuel trims, what are the values and on what bank ? compare actual MAF vs Calculated air flow

  7. Check for a possible fuel quality problem, especially with a cold engine hard start and/or a misfire on all cylinders.

    the passage
    Check for a possible fuel quality issue (especially if there is an issue of cold engine hard start and/ or an engine misíre on all cylinders).

  8. Confirm whether a crankshaft variation learn has been completed.

    the passage
    Have you completed a crankshaft variation learn?

Compiled by reading the full text of the document; each point stands on the passage shown. Check the document itself, linked below, before working on a vehicle.

Stated content

  1. Communication summary

    本予備情報は、ミスファイアおよびDTCコード P0300～P0308および/またはP050Dを示す車両が入庫した場合の診断を支援するため、TACに提供する必要がある情報について伝達するものです Machine translation (unreviewed)

    This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
    Go to this passage in the original

Source

Source
NHTSA Manufacturer Communications
Source reference
10236164
Received by source
2023-05-15
Incident date
Unknown

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