Bulletin No.: PIP5472E
Published date: 08/28/2018

Preliminary Information
PIP5472E Short Duration Mis re - Rough Idle - MIL On During Cold
Start - P050D
Models
Brand:

Model:

Model Years:

VIN:
from

to

Engine:

Transmissions:

Buick

Encore

2016 - 2018

All

All

1.4L (RPO LE2)

All

Chevrolet

Cruze

2016 - 2018

All

All

1.4L (RPO LE2)

All

Chevrolet

Equinox

2018

All

All

1.5L (RPO LYX)

All

Chevrolet

Malibu

2016 - 2018

All

All

1.5L (RPO LFV)

All

Chevrolet

Spark

2016 - 2018

All

All

1.4L (RPO LV7)

All

Chevrolet

Volt

2016 - 2018

All

All

1.5L (RPO L3A)

All

GMC

Terrain

2018

All

All

1.5L (RPO LYX)

All

Involved Region or
Country

North America

Condition

Short duration cold start rough idle, MIL on, P050D with or without
P0300 at ambient temperatures between -10C and +5C (14F to 41F).

Cause

If the SI diagnostic fails to isolate a fuel system component concern,
then one or more exhaust SHLA's (Stationary Hydraulic Lash
Adjuster) may not bleed off the cold, thick engine oil, causing the
exhaust valve not to seal the cylinder for a short duration during
cold starts.

Correction:
If you encounter the P050D with misfires that occur only during the first 15 to 30 seconds of
cold start, perform the P050D diagnostic in SI.
If the diagnostic fails to isolate a fuel system component concern, perform the following
steps.
The engine Unit Number Label is located on the engine front cover.
Example Engine Unit Number:

The first digit = engine plant.
The second digit reflects the shift, in this case 1 = First Shift
The third and fourth digits reflect the model year, in this case 18 = 2018
The fourth, fifth and sixth digits reflect the day of that calendar year 026 = 26th day of 2018
calendar year (build date)
If the engine you are working on was built on or after 17135, the SHLA's (Stationary
Hydraulic Lash Adjuster) should not be replaced for this concern.
17135: 17 = 2017 calendar year, 135 = 135th calendar day. May 15th.
If the engine you are working on was built before 17135, then replace all Exhaust SHLA's.
(Stationary Hydraulic Lash Adjuster)
Do not replace the intake side SHLA's as a slow leak rate on the intake side will not cause
this issue.
Repair Verification requires a cold start.
After SHLA replacement, following a cold soak at ambient temperatures between -10C and
+5C (14F to 41F) start the engine and retest for short duration misfires or the P050D.

Warranty Information
Labor Operation
4061270

Description
Hydraulic Valve Lash Adjuster Replacement

Labor Time
Use Published Labor
Operation Time

Version History

Version

6
Created on 02/03/2017.
2/23/2017 - to add 2016-2017 Chevrolet Volt to models list.
3/09/2017 - to add 2018 to all models.
12/11/2017 - to add 2018 GMC TERRAIN.
12/26/17 - to advise tech to perform P050D diagnostic prior to following this
PI.
08/22/2018 - To add build date information.

© 2018 General Motors. All Rights Reserved.