18NA171
Service Bulletin Details
Public Details for: 18NA171
This technical bulletin provides a procedure to repair the mechanical components and then be sure to reprogram the throttle body to prevent the conditions of a rough running engine, mil on from happening again.
Models from 2018
2018 BUICK ENCORE |
2018 CHEVROLET CRUZE |
Models from 2017
2017 BUICK ENCORE |
2017 CHEVROLET CRUZE |
Models from 2016
2016 BUICK ENCORE |
2016 CHEVROLET CRUZE |
Bulletin No.: Service Bulletin Date: 18-NA-171 February, 2019 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) Illuminated with DTC P0300 This Bulletin replaces PIP5490D. Please discard PIP5490D. Brand: Model: Buick Encore Chevrolet Cruze Model Year: VIN: from to 2016 2018 from to Engine: Transmission: 1.4L (LE2) 6T35 Automatic (MNU) or 6 Speed Manual (MF3) Involved Region or Country North America and N.A. Export Regions 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 If you encounter a vehicle with the above concern, 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 2019 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 February, 2019 Bulletin No.: 18-NA-171 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 Description Part Number Qty X PISTON, ENG Kit 12696409 1 Warranty Information For vehicles repaired under warranty, use the appropriate labor operation associated with the repair performed. Version 3 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. 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