DTCs P219A or P219B Setting With No Other Drivability Symptoms – 2016-2021 Buick Cadillac Chevrolet GMC

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Bulletin No.: PIP5802
Published date: 04/9/2021
Preliminary Information
PIP5802 Diagnostic Tip for DTCs P219A or P219B Setting With No Other Drivability Symptoms
Models

Brand:

Buick Buick Cadillac Cadillac

Model:

LaCrosse Regal ATS
CT5

Model Years:

2017 – 2019
2018 – 2020
2016 – 2019
2020 – 2021

VIN:
from to
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3.6 LGX
3.6 LGX
3.6 LGX
3.0 LGY

Engine:

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Transmissions:

Cadillac Cadillac Cadillac Cadillac Chevrolet Chevrolet Chevrolet GMC GMC

CT6 CTS XT5 XT6
Blazer Camaro Colorado Acadia Canyon

2016 – 2020
2016 – 2019
2017 – 2021
2020 – 2021
2019 – 2021
2016 – 2021
2017 – 2021
2017 – 2021
2017 – 2021

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3.0 LGW, 3.6 LGX
3.6 LGX
3.6 LGX
3.6 LGX
3.6 LGX
3.6 LGX
3.6 LGZ
3.6 LGX
3.6 LGZ

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Involved Region or Country

Condition Cause

North America
A customer may come in with an SES / CEL on and no other drivability concerns. The technician may
find a DTC P219A or P219B set in the ECM.
If other drivability concerns exist, follow SI diagnostics for the concern.
After performing normal diagnostics for these codes per SI if no cause is found then there may be
an AFM cylinder rocker arm not opening the valve due to
1) A broken locking pin shelf or
2) A stuck locking pin (see pictures below)

Correction:
To test for this concern, remove the corresponding camshaft cover and turn the engine over by hand
while watching the AFM cylinder (2 or 5) rockers (SRFF’s) and valves to ensure the rocker arm opens
the valves and not just moves with the camshaft.
If this is the case and either valve does not open on the intake or exhaust, this would cause the
imbalance and set the code.
At that point we recommend replacing both of the rockers( SRFF’s) on that camshaft either intake or
exhaust and then reevaluate the vehicle.
NOTE: We have submitted for this information to be included in SI diagnostics for these codes and
this PI will be edited, deleted, or changed into a bulletin as the need arises.
Warranty Information
For vehicles repaired under the Powertrain coverage, use the labor operation listed in the labor
time guide for the actual repair made.
Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage
information.
Version History
Version 1
Modified 04/09/2021 – Created on.

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