S2218000022

Case Number: S2218000022
Release Date: December 2022
Symptom/Vehicle Issue: Perceived Low Power/Acceleration Lag, And/Or Malfunction
Indicator Lamp (MIL) Illumination, Diagnostic Trouble Codes (DTCs) P0299
Turbocharger Underboost And/Or P026D – Fuel Injection Quantity Higher Than
Expected, Set.
Customer Complaint: Some customers may experience a perceived low
power/acceleration lag condition. Some of these vehicles may also have a MIL
illumination with DTCs P0299 and/or P026D setting in the Powertrain Control Module
(PCM) memory. It may be noted by the customer that this concern was only noticed
after a PCM calibration update was performed.
The root cause of this condition may be due to a dirty or contaminated Mass Air Flow
(MAF) sensor that is reading lower than expected but is still within its operating range.
The affect will be a perceived lack of power/acceleration lag. In extreme cases it may
also lead to DTCs P0299 and/or P026D.
NOTE: A dirty or contaminated MAF sensor cannot be cleaned without risking
damage to the sensor.
If a technician receives a vehicle in with the above condition, please perform the
following steps to verify the cause is the MAF sensor.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechConnect, eCONTACT or Service Library
entry if no solution is found.
Stellantis US LLC
Version 4.5 07/22/2022
Verification:
1. Start the vehicle and allow it to warm up until it has reached full operating
temperature.
2. Using wiTECH, navigate to the PCM “Data Tab” and monitor the Mass Air Flow
Rate (MAF) data parameter.
3. In a safe area, perform a Wide-Open Throttle (WOT) acceleration from 0-40 mph
(0-64 kph) while recording the max Mass Air Flow Rate achieved. Did the Mass
Air Flow Rate meet or exceed 1,100-1,200 mm3/inj?
a. Yes>>> The MAF sensor is operating normally. This document no longer
applies. Please proceed with normal published diagnostics for the concern.
b. No>>> Replace the MAF sensor. For detailed replacement instructions,
refer to Service Library Service Information Section 14 – Fuel System >
Fuel Injection, Diesel > Sensor, Mass Airflow (MAF) > Removal and
Installation. Proceed to (Step 4).
4. Using wiTECH, navigate to the PCM “Misc Functions” tab and perform the “Air
Flow Meter” reset routine.
5. Test drive the vehicle to verify the repair.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechConnect, eCONTACT or Service Library
entry if no solution is found.
Stellantis US LLC
Version 4.5 07/22/2022