Malfunction Indicator Lamp (MIL) Illuminated – DTC P0171 Set – 2011-2019 Buick Cadillac & Chevrolet

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NHTSA ID Number: 10161925

Manufacturer Communication Number: 19NA114

 

Summary

This informational bulletin provides information to the tech to test the PCV for proper performance before replacing the camshaft cover to correct a MIL On w/DTC P0171.

 

 


36 Affected Products

Vehicles

MAKE MODEL YEAR
BUICK ENCORE 2013-2019
CADILLAC ELR 2014-2017
CHEVROLET CRUZE 2011-2016
CHEVROLET SONIC 2012-2019
CHEVROLET TRAX 2013-2019
CHEVROLET VOLT 2012-2015

 


Condition

MIL is illuminated.

DTC P0171 (Fuel Trim System Lean) or other airflow related codes set in the Engine Control Module (ECM).

 

Cause

This condition may be caused by a torn positive crankcase ventilation (PCV) Crankcase Pressure Control Diaphragm.

⇒ The PCV crankcase pressure control diaphragm in the PCV valve could be torn, allowing un-metered air to enter the crankcase.

 

Information

Following the diagnostics in SI for that DTC may lead to the PCV system as a potential source of external airflow.

Confirmation of the PCV valve performance must be done before replacing the camshaft cover.

 


1 Associated Document

Manufacturer Communications

Bulletin No.: 19-NA-114
Date: May, 2019

https://www.nhtsa.gov/recalls?nhtsaId=10161925

MC-10161925-9999.pdf 85.283KB

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NHTSA ID Number: 10161902

Manufacturer Communication Number: 19NA114

 

Summary

This informational bulletin provides information to the tech to test the PCV for proper performance before replacing the camshaft cover to correct a MIL On w/DTC P0171.

 

1 Associated Document

Manufacturer Communications

Bulletin No.: 19-NA-114
Date: May, 2019

https://www.nhtsa.gov/recalls?nhtsaId=10161902

MC-10161902-9999.pdf 85.283KB

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NHTSA ID Number: 10149063

Manufacturer Communication Number: PIP5197J

 

Summary

This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that have excessive oil consumption, blue smoke from the exhaust, or a Malfunction Indicator Lamp. Technician should inspect the PVC orifice for leaking oil or drawing a vacuum at idle. If the PCV orifice external port is leaking oil or vacuum, replace the camshaft cover assembly. Technician will inspect for a missing intake manifold Non Return Valve that may have damaged the PCV orifice diaphragm. Check for the return valve if it is not visible use a long cotton swab to wipe any excess oil from the valve to validate. If the non return valve is still not visible, then intake manifold removal for inspection is required to validate. When the valve is present reinstall the intake manifold. When the valve is not present replace the intake manifold assembly.

 

1 Associated Document

Manufacturer Communications

Bulletin No.: PIP5197J
Published date: 10/30/2018

https://www.nhtsa.gov/recalls?nhtsaId=10149063

MC-10149063-9999.pdf 2882.673KB

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NHTSA ID Number: 10147383

Manufacturer Communication Number: PIP5197H

 

Summary

This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that have excessive oil consumption, blue smoke from the exhaust, or a Malfunction Indicator Lamp. Technician should inspect the PVC orifice for leaking oil or drawing a vacuum at idle. If the PCV orifice external port is leaking oil or vacuum, replace the camshaft cover assembly. Technician will inspect for a missing intake manifold Non Return Valve that may have damaged the PCV orifice diaphragm. Check for the return valve if it is not visible use a long cotton swab to wipe any excess oil from the valve to validate. If the non return valve is still not visible, then intake manifold removal for inspection is required to validate. When the valve is present reinstall the intake manifold. When the valve is not present replace the intake manifold assembly.

 

1 Associated Document

Manufacturer Communications

Bulletin No.: PIP5197H
Published date: N/A

https://www.nhtsa.gov/recalls?nhtsaId=10147383

MC-10147383-9999.pdf 2882.651KB

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NHTSA ID Number: 10137185

Manufacturer Communication Number: PIP5197G

 

Summary

This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that have excessive oil consumption, blue smoke from the exhaust, or a Malfunction Indicator Lamp. Technician should inspect the PVC orifice for leaking oil or drawing a vacuum at idle. If the PCV orifice external port is leaking oil or vacuum, replace the camshaft cover assembly. Technician will inspect for a missing intake manifold Non Return Valve that may have damaged the PCV orifice diaphragm. Check for the return valve if it is not visible use a long cotton swab to wipe any excess oil from the valve to validate. If the non return valve is still not visible, then intake manifold removal for inspection is required to validate. When the valve is present reinstall the intake manifold. When the valve is not present replace the intake manifold assembly.

 

1 Associated Document

Manufacturer Communications

Bulletin No.: PIP5197G
Published date: 03/13/2018

https://www.nhtsa.gov/recalls?nhtsaId=10137185

MC-10137185-9999.pdf 75.968KB

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NHTSA ID Number: 10113857

Manufacturer Communication Number: PIP5197E

 

Summary

This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that have excessive oil consumption, blue smoke from the exhaust, or a Malfunction Indicator Lamp. Technician should inspect the PVC orifice for leaking oil or drawing a vacuum at idle. If the PCV orifice external port is leaking oil or vacuum, replace the camshaft cover assembly. Technician will inspect for a missing intake manifold Non Return Valve that may have damaged the PCV orifice diaphragm. Check for the return valve if it is not visible use a long cotton swab to wipe any excess oil from the valve to validate. If the non return valve is still not visible, then intake manifold removal for inspection is required to validate. When the valve is present reinstall the intake manifold. When the valve is not present replace the intake manifold assembly.

 

1 Associated Document

Manufacturer Communications

Bulletin No.: PIP5197E
Published date: 04/4/2017

https://www.nhtsa.gov/recalls?nhtsaId=10113857

MC-10113857-9999.pdf 548.906KB

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NHTSA ID Number: 10114424

Manufacturer Communication Number: PIP5197B

 

Summary

This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that have excessive oil consumption, blue smoke from the exhaust, or a Malfunction Indicator Lamp. Technician should inspect the PVC orifice for leaking oil or drawing a vacuum at idle. If the PCV orifice external port is leaking oil or vacuum, replace the camshaft cover assembly. Technician will inspect for a missing intake manifold Non Return Valve that may have damaged the PCV orifice diaphragm. Check for the return valve if it is not visible use a long cotton swab to wipe any excess oil from the valve to validate. If the non return valve is still not visible, then intake manifold removal for inspection is required to validate. When the valve is present reinstall the intake manifold. When the valve is not present replace the intake manifold assembly.

 

1 Associated Document

Manufacturer Communications

Bulletin No.: PIP5197B
Date: Feb-2015

https://www.nhtsa.gov/recalls?nhtsaId=10114424

MC-10114424-9999.pdf 1155.486KB

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NHTSA ID Number: 10114390

Manufacturer Communication Number: PIP5197A

 

Summary

This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that have excessive oil consumption, blue smoke from the exhaust, or a Malfunction Indicator Lamp. Technician should inspect the PVC orifice for leaking oil or drawing a vacuum at idle. If the PCV orifice external port is leaking oil or vacuum, replace the camshaft cover assembly. Technician will inspect for a missing intake manifold Non Return Valve that may have damaged the PCV orifice diaphragm. Check for the return valve if it is not visible use a long cotton swab to wipe any excess oil from the valve to validate. If the non return valve is still not visible, then intake manifold removal for inspection is required to validate. When the valve is present reinstall the intake manifold. When the valve is not present replace the intake manifold assembly.

 

1 Associated Document

Manufacturer Communications

Bulletin No.: PIP5197A
Date: Feb-2015

https://www.nhtsa.gov/recalls?nhtsaId=10114390

MC-10114390-9999.pdf 1155.973KB

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NHTSA ID Number: 10112056

Manufacturer Communication Number: PIP5197

 

Summary

This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that have excessive oil consumption, blue smoke from the exhaust, or a Malfunction Indicator Lamp. Technician should inspect the PVC orifice for leaking oil or drawing a vacuum at idle. If the PCV orifice external port is leaking oil or vacuum, replace the camshaft cover assembly. Technician will inspect for a missing intake manifold Non Return Valve that may have damaged the PCV orifice diaphragm. Check for the return valve if it is not visible use a long cotton swab to wipe any excess oil from the valve to validate. If the non return valve is still not visible, then intake manifold removal for inspection is required to validate. When the valve is present reinstall the intake manifold. When the valve is not present replace the intake manifold assembly.

 

1 Associated Document

Manufacturer Communications

Bulletin No.: PIP5197
Date: May-2014

https://www.nhtsa.gov/recalls?nhtsaId=10112056

MC-10112056-9999.pdf 1385.25KB

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“This site contains affiliate links for which OEMDTC may be compensated”
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2 thoughts on “Malfunction Indicator Lamp (MIL) Illuminated – DTC P0171 Set – 2011-2019 Buick Cadillac & Chevrolet”

  1. Is there a similar problem on 2012 sonics with the 1.4l? The PCV valve is leaking and the non-return valve is not visible upon inspection. Can these repair procedures be applied to my sonic?

    Reply

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