Diagnosis Procedure

1. Turn ignition switch ON.
2. Connect CONSULT and check for existing "ENGINE" diagnostic trouble codes.
3. Check for DTC P20E8-00 current on the CONSULT screen.

Is applicable DTC current?

YES

GO TO 2 .

NO

Refer to Intermittent Incident .

1. Make sure the after treatment DEF tank is not empty and the tank level gauge is accurate.
2. Using CONSULT check for other ENGINE diagnostic trouble codes.

Is P203F-00 DTC current?

YES

Fill the DEF tank.

NO

GO TO 3 .

1. Turn ignition switch ON.
2. Using CONSULT check for the following "ENGINE" diagnostic trouble codes:
   • P2048
   • P202E

Are any of the above DTCs current?

YES

Go to the appropriate diagnosis procedure. Refer to DTC Index .

NO

GO TO 4 .

1. Turn ignition switch OFF.
2. Check the DEF tank for debris or foreign particles.
3. Check the DEF tank vent for crystallization buildup and clogging.

Is the inspection result normal?

YES

GO TO 5 .

NO

Clean the DEF tank thoroughly and fill with certified DEF.

1. Turn ignition switch ON.
2. Using CONSULT check for the following "ENGINE" diagnostic trouble code:
   • P20E9

Is the above DTC current?

YES

Refer to DTC Index .

NO

GO TO 6 .

1. Connect CONSULT, select "ENGINE" and activate "DEF System Leak Test".
2. While the test is running, inspect all DEF lines, fittings, and connections for external leaks.

Any damaged, leaking, or restricted connections found?

YES

Repair or replace the leaking DEF line, fitting, or DEF supply pump assembly.

NO

GO TO 7 .

1. Turn ignition switch ON.
2. Using CONSULT, check for air in the DEF.

Is air found in the DEF?

YES

Check the DEF dosing unit fittings, pressure line fittings, tank fittings and repair as necessary.

NO

GO TO 8 .

1. Turn ignition switch OFF.
2. Remove the tank level and temperature sensor from the DEF tank.
3. Inspect the after treatment DEF tank filter for signs of blockage or buildup.

Is the DEF tank filter blocked?

YES

Clean the DEF tank or replace the DEF supply pump assembly. Drain, clean, and refill the DEF tank.

NO

GO TO 9 .

1. Connect all components and harness connectors.
2. Remove the after treatment DEF dosing valve from the decomposition tube.
3. Place the DEF dosing valve in a measuring container having greater than a 1.5 liter [50 oz] capacity.
4. Turn ignition switch ON.
5. Using CONSULT, access "ENGINE" and select "DEF Dosing Unit Override Test" active test.

Did the DEF dosing unit operate according to specifications?

YES

GO TO 10 .

NO

Replace the DEF supply pump assembly. Refer to Exploded View .

1. Using CONSULT, select "ENGINE" and erase DTCs.
2. Operate the engine within the "Conditions for Clearing the DTC".

Is P20E8-00 DTC current?

YES

Diagnosis procedure needs to be repeated. Refer to DTC Description .

NO

Repair complete.