Manufacturer communication — 2006 GMC YUKON

ReferenceReporter type: ManufacturerENGINE

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

PIP5628G ・ fault and correction ・ for GM vehicles in general

Applies to

All brands and models with gas engines, model years 2000 - 2024.
the passage
All All 2000 - 2024 All All All Gas Engines All

Fault

With DTC P0300 - P0308 and/or P050D, use GDS and save the freeze frame records.
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)

Perform the relative compression test in the PICO NVH or Oscilloscope software; SI Document number 5518386 covers 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.
If it passes the relative compression test, the concern is an ignition or fuel delivery issue.
the passage
If it passes the relative test, you’re dealing with an ignition or a fuel delivery issue etc. and then use a ﬂow chart to determine direction etc.
Check the ignition supply voltage to the ignition module/coil assemblies and also to the fuel injectors.
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2. Check the supply ignition voltage to the ignition module/coil assemblies, and also to the fuel injectors
Inspect the spark plugs for anything abnormal.
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3. Complete a Spark plug inspection ( inspect for anything abnormal)
Note the fuel trim values and on which bank, and compare actual MAF with calculated air flow.
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5. Note the fuel trims, what are the values and on what bank ? compare actual MAF vs Calculated air ﬂow
Check for a possible fuel quality issue, especially with a cold engine hard start and/or a misfire on all cylinders.
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6. 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).
Confirm whether a crankshaft variation learn has been completed and whether there is any abnormal engine noise possibly related to the misfire.
the passage
Have you completed a crankshaft variation learn? Have you checked for any abnormal engine noise possibly related to the misíre?

Correction

Caution

The injector balance procedure in GDS is only a preliminary test and its results should not decide injector replacement, especially with a low or no flow injector.
the passage
As the procedure in GDS should only be used as a preliminary test and the results should not determine injector replacement especially if you have a low or no ﬂow injector

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

Communication summary
本予備情報は、失火及びDTC Codes P0300-P0308及び/またはP050Dを伴う車両がご来店された場合に、TACへの診断支援に提供する必要がある情報について通知するものです。 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: 10242298
Received by source: 2023-09-18
Incident date: Unknown

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