Malfunction Indicator Lamp (MIL) Illuminated – DTC P0172 Set – 2013-2019 Buick Cadillac Chevrolet & GMC

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Bulletin No.: 18-NA-246
Date: June, 2019

Service Bulletin

TECHNICAL

Subject: Malfunction Indicator Lamp (MIL) Illuminated – DTC P0172 Set (North America Vehicles Only)

Attention: This Bulletin applies to the vehicles that have fuel enriched engine oil due to short driving intervals.

Service Procedure

Important: Perform all of the procedures below that apply to the model year of the vehicle being worked on. For 2019 Model Years:

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Vehicles built after May 7, 2019 may already have the updated PCV installed. Inspect the Engine Julian Date by reviewing the EUN on the front engine cover.

For 2016-2018 Model Years:

Note: Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. Install a GM Authorized Programming Support Tool to maintain system voltage. Refer to www.gmdesolutions.com for

further information. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. DO NOT connect a battery charger.

Program the ECM to the latest software available. Refer to K20 Engine Control Module: Programming And Setup in SI.

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Example Engine Unit Number:

• The first digit reflects the engine plant (in this case T = Tonawanda).
• The second digit reflects the shift (in this case 1 = First Shift).
• The third and fourth digits reflect the calender year (in this case 18 = 2018).
• The fifth, sixth and seventh digits reflect the day of that calendar year (in this case 162 = 162nd day of 2018 calendar year (build date)). If the engine you are working on was built on or after Julian Date 19127 (May 7, 2019),

EUN# T119127 XHXTX0251, the PCV does not need to be replaced. The new revised PCV is already installed in the camshaft cover. Refer to SI for further diagnostics.

Engines built prior to Julian Date 19127 (May 7, 2019), EUN# T119127 XHXTX0251, have the old style primary PCV valve installed and will need to be replaced. Continue with service procedure below.

For 2016-2019 Model Years:

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Note: The graphic above compares the old style primary PCV valve (A) to the new revised PCV valve (B).

1. Remove the camshaft cover (3). Refer to Camshaft Cover Replacement in SI.
2. Remove the old style PCV valve from the coverand discard.
3. Apply a light coating of oil to the new revised PCV valve O-ring.

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4. Using hand pressure, install the new PCV valve into the cover until seated into bore.
5. Install the camshaft cover.

2013-2019 Model Years:

Note: An oil and filter change is necessary to remove excessive fuel collected in the crankcase and correct the DTC set.

1. Perform an oil change. Refer to Engine Oil and Oil Filter Replacement in SI.
2. Clear the code and take the vehicle for a test driveto validate that the code does not return.

Important: If the customer continues to frequently operate the vehicle in this manner, they MUST change the engine oil and filter more frequently than the oil life monitor indicates. How often the customer must change the engine oil is based on how they operate the vehicle.

Parts Information

Warranty Information

Important: Only select the labor operation that coincides with the repair performed. For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.

Warranty Claim Code Information Retrieval

If the SPS Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS system as follows:

• Open TIS on the computer used to program the vehicle.
• Select and start SPS.
• Select Settings.
• Select the Warranty Claim Code tab.

The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. If the code is retrievable, dealers should resubmit the transaction making sure to include the code in the SPS Warranty Claim Code field.

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