Manufacturer communication — 2006 GMC YUKON

ReferenceReporter type: ManufacturerEQUIPMENT:ELECTRICAL:ACCESSORY GENERATOR:OUTLETS/RECEPTACLE

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

PIP5628E ・ fault and correction ・ for GM vehicles in general

Applies to

Applies to all brands, models and engines, 2000 - 2022.
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All All 2000 - 2022 All All All All

Fault

With DTC P0300 - P0308 and/or P050D, use GDS and save the freeze frame records.
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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 within the PICO NVH software.
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Perform the relative compression test within the PICO NVH software
If the relative compression test fails, do a cylinder leakage test and note whether a leak is observed.
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If it fails do a cylinder leakage test, was a leak observed?
If there is no leak, look for valve train issues or the possibility of a bent connecting rod.
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if you didn’t have a leak, than explore for valve train issues or the possibility of a bent connecting rod
If the relative compression test passes, the problem is an ignition or fuel delivery issue.
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If it passes the relative test, you’re dealing with an ignition or a fuel delivery issue etc.
Check the ignition supply voltage to the ignition module/coil assemblies and 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 misêre on all cylinders).
Confirm that a crankshaft variation learn has been completed, and check for any abnormal engine noise possibly related to the misfire.
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Have you completed a crankshaft variation learn? Have you checked for any abnormal engine noise possibly related to the misêre?

Correction

Caution

The injector balance procedure in GDS is only a preliminary test; its results should not determine injector replacement, especially with a low or no flow injector.
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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、ミスファイアおよび DTC コード P0300～P0308 および/または P050D を伴って入庫した車両の診断を支援するため、TAC に提供する必要のある情報を通知するものである。 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: 10232811
Received by source: 2023-03-13
Incident date: Unknown

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