Poor Engine Performance in Extremely Cold Weather Conditions, PCV Bypass Hose and Charge Air Cooler Icing for LUV Engines, Malfunction Indicator Lamp (MIL) Illuminated – DTC P0299, P0234, P2227, P00C7 Set – 2013-2021 Buick Encore & Chevrolet Trax

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Copyright 2022 General Motors LLC. All Rights Reserved. Service Bulletin Bulletin No.: 16-NA-405 Date: October, 2022 TECHNICAL Subject: Poor Engine Performance in Extremely Cold Weather Conditions, PCV Bypass Hose and Charge Air Cooler Icing for LUV Engines, Malfunction Indicator Lamp (MIL) Illuminated – DTC P0299, P0234, P2227, P00C7 Set Attention: For vehicles that are out of warranty and are identified on the Applicable Warranties section in the GM Global Warranty Management system, refer to Special Coverage #17157 or A192272980. Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Buick Encore 2013 2021 Refer to Parts Information section for breakpoints. Equipped with 1.4L (RPO LUV) — Chevrolet Trax Involved Region or Country North America Condition Some customers may comment that when driving in extremely cold weather conditions (-18°C or less / 0°F or less), their vehicle experiences one or several of the following conditions: • Loss of power. • Smoke out the tail pipe. • Hesitation on acceleration. • Stalling condition. • Burning oil odor possibly caused by oil leak. • May also notice a Malfunction Indicator Lamp illuminated. • After driving for a period of time, the driveability issues seem to diminish. • Malfunction Indicator Lamp (MIL) Illuminated. This condition may also cause an increase in crankcase pressure, creating oil leaks at seals and gaskets. The technician may find one or more of the following DTCs set: • P0299 • P0234 • P2227 • P00C7 Cause This condition may be caused by one or more of the following: • Plugged crank case vent tube from ice forming in the tube during very cold weather conditions. • Ice accumulating in the intake manifold forming and blocking the PCV passage in the cylinder head. • Ice accumulation in the charge air cooler, restricting air flow to the throttle body. Page 2 October, 2022 Bulletin No.: 16-NA-405 Correction Important: The PCV heater parts are only to be used in northern states or provinces where temperatures are -18°C or less / 0°F or less and for critical customers only. Important: The DTCs and symptoms above are not exclusively related to freezing/icing conditions. Only follow this bulletin when the condition is directly correlated with extreme cold of -18°C or less / 0°F or less. System leaks should always be ruled out first for P0299. Signs of moisture will always be present in the CAC system and are not a reliable indicator of freezing/icing. Note: U.S. vehicles are NOT built with the revised CAC or heated PCV bypass system. To determine which CAC is installed in the vehicle, refer to Charge Air Cooler Outlet Air Elbow Duct Replacement below. If any of the conditions is validated to be caused by freezing/icing, verification of the following components is necessary on all U.S. and Canadian vehicles: • Grille Winter Cover • Heated PCV Bypass system • Modified Charge Air Cooler (CAC) • Elbow Duct If not previously performed, install either the grille cover, heated PCV bypass, CAC or elbow duct. If the vehicle has a verified icing condition associated with extreme cold, but has all the components listed above installed, perform the Intake Air Pressure and Temperature Sensor Inspection and Cleaning procedure and CAC drain procedure below. If not previously performed, an oil change may be necessary to remove any moisture from the engine. Prior to the oil change, warm the engine up completely to melt any ice in the engine. Important: Allow time for the vehicle to thaw in a warm environment to avoid damaging or breaking parts that may be required to be re-installed. Grille Winter Cover Installation Warning: Remove the grille cover when temperatures are consistently above 32°F/ 0°C to prevent engine and transmission overheating. Remove the grille cover before towing a trailer of any size. Failure to do so will decrease transmission cooling efficiency and possibly cause damage to the drivetrain. Note: The cover may appear to be undersized. The vinyl used may stretch during installation to ensure a tight fit. It is highly recommended to warm the vinyl cover so that it can be pliable enough to install onto the front bumper fascia. 5197596 1. Using care, orientate the fascia winter cover to the bumper fascia. Bulletin No.: 16-NA-405 October, 2022 Page 3 5193266 2. Attach the cover to the fascia by pushing the hooks through the grille openings. 3. Validate that all the hooks are engaged and the cover is a tight fit. Intake Manifold and Cylinder Head Inspection 1. Remove the intake manifold. Refer to Intake Manifold Replacement in SI. 5286434 2. Inspect the vacuum ports of the intake manifold for ice accumulation. 5286457 3. Inspect the PCV intake runner for ice build-up blocking the cylinder head as shown above. Page 4 October, 2022 Bulletin No.: 16-NA-405 5286568 4. Clean any ice/sludge/water/carbon out of the PCV pipes/hoses, the PCV nipple on the intake manifold, the PCV intake runners and the orifice between the #2 and #3 intake ports. 5587832 Note: The charge air bypass regulator solenoid valve can be affected if liquid has been found in the vacuum tank. Draining of the fluid can be done through the vacuum port (1). 5. Separate the charge air bypass regulator solenoid valve vacuum line (2) from the intake manifold. 5587732 6. Rotate the intake (1) to allow the fluid to bypass the chamber internal to the manifold. 7. Tilt the intake (2) to allow the fluid to exit the intake through the vacuum port. Bulletin No.: 16-NA-405 October, 2022 Page 5 5590615 8. Inspect the charge air bypass valve for oil leaking from the vacuum side port. 5590616 • If oil is found leaking from the valve port, disassemble and clean the components. Refer to Charge Air Bypass Valve Replacement in SI. • Only if necessary, replace the components. 9. Install the valve. 10. Install the intake manifold. Charge Air Cooler Outlet Air Elbow Duct Replacement 5236304 Important: If this vehicle has the CAC outlet tube P/N 42698921 installed on the vehicle, replace the air duct with the NEW kit part number 42751703. Important: If the kit part number 42751703 is not available, the dealer can order a new CAC outlet hose part number 42731155. 1. Remove the charge air cooler outlet air hose. Refer to Charge Air Cooler Outlet Air Hose Replacement in SI. Page 6 October, 2022 Bulletin No.: 16-NA-405 6159510 2. Inspect the charge air cooler through the inlet to determine if the vehicle has the new or old design. • If the charge air cooler is the old design (shown by X in the graphic), proceed to the Charge Air Cooler Replacement section below. • If the charge air cooler is the new design (shown by the check mark in the graphic – note the wider fin spacing and a division in the middle of the charge air cooler), no charge air cooler replacement is necessary. 3. Remove and clean the IAPT sensor. 4. Using care, remove the bands that secure the air hoses to the elbow duct. 5410152 Note: The new elbow duct will have an estimated 45 degree mounting surface for the IAPT. 5. Install the new elbow duct onto the air hoses aligning the duct to the marks. 6. Install the band clamps. 7. Install the IAPT sensor. 8. Install the charge air cooler outlet air hose. Bulletin No.: 16-NA-405 October, 2022 Page 7 Intake Air Pressure and Temperature Sensor Inspection and Cleaning 4910635 1. If necessary, remove the intake air pressure and temperature (IAPT) sensor (2). Refer to Intake Air Temperature Sensor Replacement in SI. 4910683 Important: Due to the sensitivity of the IAPT, Do Not use any chemical cleaners including water and Do Not use compressed air to remove contaminates. 2. Inspect the IAPT sensor for any contaminates. 5020216 3. Allow time for any ice build-up to melt by placing the sensor port down. 4. Clean the sensor with a clean towel. 5. Inspect the IAPT sensor for any contaminates. 6. Install the sensor into the elbow duct. Page 8 October, 2022 Bulletin No.: 16-NA-405 PCV Heater Installation Notice: The PCV heater may have been installed previously onto the vehicle. If the PCV heater has been installed, proceed to step 35. 1. Operate the vehicle until it reaches operating temperature. 2. Remove the battery. Refer to Battery Replacement in SI. 3. Remove the engine cover. 2773935 4. Remove and discard the air cleaner outlet duct (2) and resonator assembly. Caution: DO NOT remove the vacuum hose from the engine unless the vacuum hose shows apparent signs of damage. Damage to the nipple on the intake manifold may occur when attempting to disconnect the vacuum hose. Bulletin No.: 16-NA-405 October, 2022 Page 9 4855374 5. Using care, cut and remove the tape that secures the vacuum line to the positive crankcase ventilation (PCV) hose/pipe/tube. 2191937 Note: Original PCV pipe with vacuum line attached removed from vehicle for illustrative purposes ONLY. 6. Remove and discard the PCV hose/pipe/tube (1) leaving the vacuum line. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement in SI. Page 10 October, 2022 Bulletin No.: 16-NA-405 4910635 7. If necessary, remove the intake air pressure and temperature (IAPT) sensor (2). Refer to Intake Air Pressure and Temperature Sensor Replacement in SI. 4377828 8. Install the block off plug (1) onto the turbocharger PCV bypass port (2). 4855375 9. Using a tie strap, secure the vacuum line to the engine wiring harness. Bulletin No.: 16-NA-405 October, 2022 Page 11 4418077 10. Install the new air cleaner outlet duct (1) and air resonator (3) assembly. 11. Using care, cut and remove the tape securing the vacuum line to the NEW PCV pipe. 12. Remove the vacuum line from the PCV pipe assembly. 4855376 13. Install the new PCV pipe assembly. 14. Install the PCV heater into air cleaner outlet duct. 15. Using Woven Polyester Electrical Tape (PET), secure the vacuum line to the PCV pipe. Page 12 October, 2022 Bulletin No.: 16-NA-405 2760835 16. Remove the fuse block cover (1). 17. Remove the nut (4) that secures the upper fuse block to the body. 18. Loosen the three upper connector bolts (2). 19. Separate the upper (5) fuse block assembly from the fuse block base (8) by releasing the snap locks. Refer to Front Compartment Fuse Block Replacement in SI. 20. Route the PCV wiring harness under the battery tray. 4377876 21. For 2013-2016 model vehicles: 21.1. Remove UEX_X2 connector from the fuse block base. 21.2. Remove connector cover. Bulletin No.: 16-NA-405 October, 2022 Page 13 21.3. Install PCV heater wiring harness terminal (1) into the J11 cavity (2). ⇒ Refer to X50A Fuse Block – Underhood X2 (Doc ID 4752878) in SI. 21.4. Route the wiring harness between the battery and fuse block. 4598974 22. For 2017-2020 model vehicles: 22.1. Remove the UEX_X3 connector from the fuse block base. 22.2. Remove the connector cover. 22.3. Remove connector lock (1). 22.4. Install PCV heater wiring harness terminal into the H6 cavity (2). ⇒ Refer to X50A Fuse Block – Underhood X3 (Doc ID 4752879) in SI. 23. Using tie straps, fasten the PCV wiring harness to the connectors wiring harness at the white tape indicators. 24. Install the connector back onto the fuse block base. Important: Only replace the fuse and install the labels on vehicles that have a 5 amp fuse. Some vehicles have the 10 amp fuse already installed and do not require replacement or the label. 4379861 25. Position and snap the upper fuse block onto the base. Tighten Tighten the bolts (1) to specifications. Refer to Fastener Specifications in SI. 26. If necessary, replace the 5 amp fuse with a 10 amp fuse into cavity F17 (2). 27. Install the front compartment fuse block cover. 4605957 28. Install the PCV heater wiring harness ground wire (2) to ground G103 (1). Page 14 October, 2022 Bulletin No.: 16-NA-405 4379843 29. If necessary, install the UEC sticker onto the backside of the fuse block cover and in the owners manual under Engine Compartment Fuse Block. 4609442 30. Route the PCV heater wiring harness across the engine wiring harness. 31. Using the tie straps, fasten the wiring harness at the white marking points (1). 32. Connect the electrical connector (3) to the PCV heater (2). 33. Install the battery. 34. Install the engine cover. 35. If required, perform an oil change. Refer to Engine Oil and Oil Filter Replacement in SI. Bulletin No.: 16-NA-405 October, 2022 Page 15 Charge Air Cooler Replacement 2851444 1. Remove the CAC (2). Refer to Charge Air Cooler Replacement in SI. • If the revised CAC was previously installed, drain and reinstall the revised CAC. • If the CAC has not been replaced with a new revised version, then replace the CAC. 2. Install the modified CAC. Page 16 October, 2022 Bulletin No.: 16-NA-405 Parts Information Note: BUP plant = ‘K’ VIN pos 1 SLP plant = ‘3’ VIN pos 1 Description Model Year Country Build Prior To Part Number Qty Kit, PCV Heater 2013-2016 Canada All VINs 25198125 1 U.S. All VINs 2017-2018 Canada All VINs 25198126 1 U.S. All VINs 2019-2021 Canada Installed During Production — — U.S. All VINs 12711708 1 Cooler, Charge Air 2013-2018 Canada Built prior to Sept. 27, 2017 (VIN pos 1 = K) 42574031 1 U.S. All VINs 2013-2018 Canada Built prior to March 19, 2018 (VIN pos 1 = 3) 42582747 1 U.S. All VINs 2019-2021 Canada Installed During Production — — U.S. All (VIN pos 1 = K) 42574031 1 U.S. All (VIN pos 1 = 3) 42582747 1 DUCT, CHRG AIR CLR OTLT AIR (KIT) 2013-2021 All Built prior to October 15, 2019 (VIN pos 1 = K) 42751703 Important: If the part is not available, the dealer can order a new CAC outlet hose part number 42731155. 1 All (VIN pos 1 = 3) SEAL, INT MANIF All — Refer to the Electronic Parts Filter, Oil All — Catalog (EPC). Oil All — Description Model Year Model Part Number Qty Cover, Grille Winter 2013-2016 &VK3 (with license plate bracket) Trax 42697325 1 2013-2016 -VK3 (without license plate bracket) 42702689 1 2014-2016 Note: 2020-2021 Encore will have a winter cover supplied in the vehicle. Encore 42697326 1 2017-2021 42697332 1 2017-2021 Trax 42697331 1 Bulletin No.: 16-NA-405 October, 2022 Page 17 Warranty Information Note: Only select the Labor Operation that corresponds 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. Labor Operation Description Labor Time 4081358* Diagnostic System Check 0.3 hr Add Intake Manifold Inspection and Cleaning 1.2 hrs Add PCV Heater, Wiring Harness Installation 1.0 hr Add IAPT Inspection and Cleaning 0.2 hr Add Engine Oil and Oil Filter Replacement 0.3 hr Add Charge Air Cooler Flush and Clean 1.4 hrs Add Charge Air Cooler Outlet Air Duct Replacement 1.2 hrs Add Charge Air Cooler Replacement 1.0 hr Add Winter Grille Cover Installation** 0.2 hr Add Charge Air Bypass Valve Cleaning 0.8 hr *This is a unique Labor Operation for bulletin use only. **Installation perform is a one time charge only. Page 18 October, 2022 Bulletin No.: 16-NA-405 Version 17 Modified December 23, 2016 – Added DTCs to the Condition and a Note to the Parts Information. January 05, 2017 – Removed Fascia Blocker information. January 18, 2017 – Added draining the CAC. September 07, 2017 – Added fascia blocker removal information and added CAC part numbers. December 05, 2017 – Added RPO LUV to Subject, added the 2018 Model Year, modified the Attention statement and added IAPT sensor information. February 02, 2018 – Removed thaw CAC information and added connector pinout reference. April 04, 2018 – Added the Intake Air Pressure and Temperature Sensor Inspection section, an Important statement above step 8 and additional steps 9 and 10 on how to care for the IAPT, repair breakpoints and updated Warranty Information. September 25, 2018 – Added first Important statement for thawing vehicle after the Correction, updated the second Important statement, removed fascia blocker information before step 40 and updated the Warranty Information. January 04, 2019 – Added Winter Cover information. January 23, 2019 – Updated the Model Year information for P/N 42702689 in Parts Information table. March 26, 2019 – Added the 2019 Model Year, updated Breakpoint reference in Models, updated the Cause and Correction sections, added Note after Correction section, added Intake Manifold and Cylinder Head inspection section, added graphic and Important statement on the wrong CAC tube being installed under Intake Air Pressure and Temperature sensor Inspection, removed fascia blocker step and updated step 40 of the Service Procedure and updated the Parts and Warranty Information sections. January 08, 2020 – Added the 2020 Model Year, updated the service procedures and updated the Parts Information section to add a new CAC Duct Part Kit, an Important statement under P/N 42751703 and a Note statement for 2020 Encore vehicles receiving winter covers. March 18, 2020 – Added a Special Coverage reference in the Attention statement, clarified the Warning statement and added a video under Grille Winter Cover Installation, and updated the Charge Air Cooler Outlet Air Elbow Duct Replacement section by adding the CAC design inspection step. May 04, 2020 – Added fluid removal from the intake manifold and charge air bypass valve inspection and cleaning steps in the Intake Manifold and Cylinder Head Inspection section. February 12, 2021 – Added the 2021 Model Year, updated the 2019-2021 MY PCV KIT part number and added 2021 to the Parts Information section. Revised September 26, 2022 – Replaced P0236 with P0234 and Updated the Correction section Information. GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

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