Manufacturer communication — 2006 GMC YUKON

ReferenceReporter type: ManufacturerENGINE AND ENGINE COOLING

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 models, 2000 - 2022.
the passage
All All 2000 - 2022 All All All All

Fault

For a vehicle 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 within the PICO NVH software.
the passage
Perform the relative compression test within the PICO NVH software
If it fails, do a cylinder leakage test and note where the leak is (intake, exhaust, crankcase); with no leak, look for valve train issues 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
If it passes the relative 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.
Check the supply ignition 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
Inspect the spark plugs for anything abnormal.
the passage
Complete a Spark plug inspection ( inspect for anything abnormal)
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
Check for a possible fuel quality issue, 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 misêre on all cylinders).
Confirm whether a crankshaft variation learn has been completed.
the passage
Have you completed a crankshaft variation learn?

Correction

Caution

The injector 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
本通知は、ミスファイアおよびDTCコードP0300～P0308および/またはP050Dを伴って入庫した場合、TACでの診断を支援するために提供する必要がある情報を通知するものです。 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: 10206726
Received by source: 2022-01-24
Incident date: Unknown

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