PIE0433

Subject:
Engineering Information – Malfunction Indicator Lamp (MIL) On, DTCs P0171 Fuel Trim System
Lean Bank 1 and/or P0174 Fuel Trim System Lean Bank 2
Attention:
Proceed with this EI ONLY if the customer has commented about this concern AND the PIE
number is listed in the Global Warranty Management / Investigate History link (GWM/IVH). If the
customer has not commented about this condition or the EI does not show in GWM/IVH,
disregard the PI and proceed with diagnostics found in published service information. THIS IS
NOT A RECALL — refer to the latest version of Service Bulletin 04-00-89-053 for more details on
the use of Engineering Information bulletins.
Brand:
Model:
Model Year:
VIN:
from
to
Buick
Enclave
2014
2018
Chevrolet
Traverse
2014
2018
Chevrolet
Equinox
2014
2017
GMC
Acadia
2014
2018
GMC
Terrain
2014
2017
from
Engine:
Transmission:
LLT, LFY or LFX
All
to
Involved Region or Country
North America
Additional Options (RPO)
Equipped with 3.6L HFV6 Engine RPOs (LLT), (LFY) or (LFX)
Condition
Important: If the customer did not bring their vehicle in for this concern, DO NOT proceed with this
EI.
Some customers may comment on a malfunction indicator lamp (MIL) illuminated.
Upon investigation technician may find DTCs P0171 Fuel Trim System Lean Bank 1 and/or P0174
Fuel trim System Lean Bank 2 active or stored in history.
Cause
GM Engineering is attempting to determine the root cause of the above condition. Engineering has a
need to gather information on vehicles PRIOR to repair that may exhibit this condition. As a result,
this information will be used to "root cause" the customer's concern and develop/validate a field fix.
Correction
1
If you encounter a vehicle with the above concern, check for leak at the foul PCV tube to manifold connection as illustrated above.
•
If a leak is found, contact the engineer listed below.
•
If no leak is found, continue diagnosis referring to SI.
Contact Information
Engineer Name
Phone Number
Charlie Allen
(248) 878-1599
Please include the following information if leaving a message:
–
Technician name
–
Dealer name and phone number
–
Complete VIN and repair order (R.O) number
On the repair order, document the date and time the call was placed (even if the engineer was not reached).
If engineering is unable to return the call within one hour, proceed with diagnosis and repair based on information found in SI.
Warranty Information
If engineer was contacted or required information was provided, use:
Labor Operation
Description
Labor Time
4081898*
Engineering Information — Malfunction Indicator Lamp On DTCs
P0171 Fuel Trim System Lean Bank 1 and/or P0174 Fuel Trim System
Lean Bank 2
0.4 hr
*This is a unique Labor Operation for Bulletin use only. It will not be published in the Labor Time Guide.
2