18NA171
Service Bulletin Details
Public Details for: 18NA171
This technical bulletin provides a procedure to repair the mechanical components and then reprogram the throttle body to prevent the conditions of a rough running engine, mil on from happening again.
Models from 2019
2019 BUICK ENCORE |
2019 CHEVROLET CRUZE |
2019 CHEVROLET TRAX |
Models from 2018
2018 BUICK ENCORE |
2018 CHEVROLET CRUZE |
2018 CHEVROLET TRAX |
Models from 2017
2017 BUICK ENCORE |
2017 CHEVROLET CRUZE |
Models from 2016
2016 BUICK ENCORE |
2016 CHEVROLET CRUZE |
Service Bulletin Bulletin No.: 18-NA-171 Date: July, 2020 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) Illuminated with DTC P0300 This bulletin replaces PIP5490D. Please discard PIP5490D. Brand: Model: Buick Encore Chevrolet Cruze Trax Model Year: from 2016 VIN: to from to 2019 — — 2018 Engine: Transmission: 1.4L (LE2) 6T35 Automatic (MNU) or 6 Speed Manual (MF3) Involved Region or Country North America, Israel, South America Condition Some customers may comment on a rough running engine with the Malfunction Indicator Lamp (MIL) Illuminated. Upon inspection, a technician may find DTC P0300 (Engine Misfire Detected) set in the Engine Control Module (ECM) along with a misfire and low compression in one or more cylinders. Cause This condition may be caused by a damaged piston requiring replacement. Correction Repair the engine mechanical concern based on the results of the Service Procedure below. Service Procedure Perform an engine compression test. Refer to Engine Compression Test in SI. • If low compression is found, perform a cylinder leakage test. Refer to Cylinder Leakage Test in SI and record the test results to isolate the concern. Note: To isolate the source of cylinder leakage to a valve or cylinder sealing issue, it may be necessary to remove the intake and exhaust manifolds. • If excessive leakage to the crankcase is isolated, check all four cylinder walls for damage. If the cylinder wall surfaces have not been damaged, replace all four pistons and fill the crankcase with current specification Dexos oil. Refer to Bulletin Number 16-NA-367. Copyright 2020 General Motors LLC. All Rights Reserved. An un-metered air leak in the induction system, or an engine mechanical issue causing rough running, may cause the ECM to learn an incorrect Throttle Body Idle Airflow Compensation value over time. This incorrectly learned value may cause various symptoms to occur such as MIL on with P1101 setting, rough or unstable idle speeds and/or engine stall. Once the mechanical repairs have been completed, perform a throttle body inspection and cleaning. Refer to Throttle Body Inspection and Cleaning in SI, followed by Throttle Body Idle Air Flow Compensation Reset function in GDS2. Note: For the Cruze vehicles only – A calibration has been released that will help to reduce the possibility of a cracked piston. Update the engine control module to the latest calibration available. Page 2 July, 2020 Parts Information Note: The piston and rod assembly referenced in this bulletin arrives with rod bolts that are allowed to be removed and reused one time for final assembly to the complete repair. Causal Part X N/A Description Part Number Qty Piston, Kit 12705612 4 Rings, Piston 55588455 4 Rod Asm-Conn 12688858 4 Bearing Kit, Con Rod 12674806 4 Gasket Kit, Cyl Head (inc bolts) 12687228 1 Filter, Oil 12696048 1 Seal, Cr/Shf Frt Oil 12661527 1 Seal Kit, F/Injrn Fuel Rl 12659782 1 GASKET, TMG CHAIN TENSR 12636523 1 Nut, Turbo 11546365 4 Gasket, Ctltc Conv 12641115 1 12673929 1 Pipe, Fuel Feed Inter 12684046 1 Shield, Turbo Ht Pan, Lwr Oil 12637773 1 Gasket, O/Pump 12644558 1 Gasket, O/Pump 12644557 1 Bolt, Eng Mt 11610904 3 Bolt, Eng Mt 11547918 2 Bolt, Cr/Shf Balr 11611070 1 Seal, Turbo Cool Rtn Pipe 12662185 4 Washer, Turbo Oil Feed Pipe 12662184 2 Gasket, Turbo Oil Rtn Pipe 12640468 1 BOLT, F/INJR 55570735 8 Bulletin No.: 18-NA-171 Bulletin No.: 18-NA-171 July, 2020 Page 3 Warranty Information For vehicles repaired under warranty, use the appropriate labor operation associated with the repair performed. Version 6 Modified Released May 22, 2018 August 06, 2018 – Added the Encore model and Parts Information section. February 19, 2019 – Added a Note to the Parts Information section. July 09, 2019 – Added the Trax model, Parts Information and Additional Keywords. August 20, 2019 – Added the 2019 Model Year, updated the Involved Region or Country section and updated the Parts Information table. July 08, 2020 – Added Bolt, F/Injr P/N 55570735 to the Parts Information table. Additional SI Keywords: P0301, P0302, P0303, P0304 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