S2018000001 Rev.

Case Number: S2018000001 REV. A
Release Date:
1/21/2021
Symptom/Vehicle Issue: Malfunction Indicator Lamp (MIL) Illumination. Diagnostic
Trouble Code (DTC) P26FB – EGR Cooler Bypass Control Stuck Closed Bank 1 Set.
Discussion: A small number of customers may experience a MIL illumination. Upon
investigation, a technician may find DTC P26FB setting in the Powertrain Control
Module (PCM). If you receive a vehicle in with this DTC, please perform the following:
1. Perform normal published diagnostics for P26FB.
2. During your diagnosis, closely inspect the vacuum supply tube to the EGR
Cooler Bypass Valve remote solenoid for blockage (See Fig. 1)
NOTE: There is a .6mm brass orifice in the vacuum tube assembly at the elbow
connection. Some resistance in air flow is normal (See Fig. 2 and 3).
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 or eCONTACT ticket if no
solution is found
FCA US LLC
Version 4.3 10/28/2020
3. Carefully inspect the vacuum tube for the presence of a blockage in the orifice.
This can be done by attempting to blow light air pressure through the tube
assembly.
4. If the orifice in the tube is found blocked, please replace the tube assembly. DO
NOT attempt to remove the blockage.
5. Inspect the internal integrity of the bypass valve by performing the following
steps:
a. Gain access to the bypass valve vacuum actuator, and using your thumb,
actuate the actuator in and out. (See Fig. 4). Ensure that the valve operates
smoothly without sticking.
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 or eCONTACT ticket if no
solution is found
FCA US LLC
Version 4.3 10/28/2020
b. With the valve actuator pushed in, quickly release the valve, and allow
spring pressure to rapidly close the bypass valve. As it closes, listen for an
audible, metallic “snap” sound as the internal valve contacts the internal
housing. This indicates that the internal valve is properly intact. If the
metallic “snap” sound is not heard, the bypass valve will have to be
replaced which is part of the EGR cooler.
6. If all of the steps have been followed, and no issue has been found, update the
PCM with the latest available software. Follow all normal published TSBs for all
repair steps, and LOPs for flashing the PCM.
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 or eCONTACT ticket if no
solution is found
FCA US LLC
Version 4.3 10/28/2020