Service Engine Soon (SES) Light On, DTC 0226 Set (Replace Fuel Pressure Regulator (Limiter))

Some customers may comment that the Service Engine Soon (SES) indicator is illuminated. Upon investigation, a DTC 0226 may be found.

Replace the fuel pressure regulator (limiter) using the following service procedure and the part numbers listed below.

Caution: Diesel fuel is extremely flammable. Allow the engine to cool before servicing the fuel system. Ensure that there are no open flames or any spark/heat generating equipment in the general work area. Any collected fuel must be disposed of properly.

1. Park and secure the vehicle on a level surface.
2. Tilt and secure the cab. Refer to Cab Tilting in the General Information subsection of the applicable Service Manual.




Caution: Cover the outlet (top) line banjo bolt with cloth while loosening the bolt. Fuel may be under pressure and splash while loosening the outlet (top) line banjo bolt. Use caution when handling fuel.

3. Carefully loosen the outlet (top) line banjo bolt (2) of the fuel filter housing in order to relieve the fuel pressure.
4. Place a drain pan under the vehicle to collect any fuel that may spill.



5. Remove the fuel pipe clip bolt and clip (1), if equipped.
6. Remove the fuel return overflow pipe bolt (3).
7. Carefully pull the fuel return overflow pipe away from the fuel pressure regulator (limiter) (2).
8. Loosen the fuel pressure regulator (limiter) using the integral nut and remove as an assembly. Pull the assembly away from the common rail.

Important: The date code must be inspected on the fuel pressure regulator (limiter) (see charts A and B below). Only use the correct fuel pressure limiter type, or fuel leakage may occur.

9. Install the new fuel pressure regulator (limiter) as an assembly and tighten to specifications (See chart A below).
10. Install the fuel return overflow pipe and bolt.

Tighten
Tighten the bolt to 12 N·m (106 lb in).

11. Install the fuel pipe clip and bolt.

Tighten
Tighten the bolt to 9 N·m (80 lb in) while supporting the bracket with the other hand in order to prevent unnecessary force on the pipe.

12. Bleed the fuel system using the procedure listed below.

1. Loosen the primer pump knob on the injector pump.
2. Pump the primer pump until a solid stream of fuel purges out of the previously loosened banjo bolt.

Tighten
Tighten the outlet line banjo bolt to 14 N·m (124 lb in).

3. Tighten the primer pump knob. Push down and turn to close.
4. Start the engine. If the engine does not start, repeat the bleeding procedure again.
5. Lower and secure the cab.

*Fuel pressure regulator (limiter) type must be determined by the date code.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: