NUMBER: 18-088-15
GROUP: Vehicle Performance
DATE: November 26, 2015
SUBJECT:
P20EE SCR NOX Catalyst Efficiency Below Threshold Bank 1
OVERVIEW:
This bulletin involves verifying the proper operation of the Diesel Exhaust Fluid (DEF) system and, if necessary, replacing the Selective Catalyst Reduction (SCR) Catalyst assembly.
MODELS:
NOTE: This bulletin applies to vehicles equipped with a 6.7L diesel engine (sales code ETK).
SYMPTOM/CONDITION:
Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the Technician may find Diagnostic Trouble Code (DTC) P20EE SCR NOX Catalyst Efficiency Below Threshold Bank 1 set in the Powertrain Control Module (PCM) memory.
DIAGNOSIS:
Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in TechCONNECT, verify all vehicle systems are functioning as designed. If DTCs other than the ones listed above are present record them on the repair order and repair as necessary before proceeding further with this bulletin.
If the customer describes the symptom/condition listed above or if the technician finds the DTC, perform the Repair Procedure.
PARTS REQUIRED:
| Qty. | Description | Part No. |
|---|---|---|
| 1 (AR) | Converter, SCR Catalyst (Regular Cab) | 68292410AA |
| 1 (AR) | Converter, SCR Catalyst (Crew Cab) | 68292411AA |
| 1 (AR) | Converter, SCR Catalyst (Mega Cab) | 68292412AA  |
| 1 (AR) | Wiring Sleeve Kit | 04778570 |
| 1 (AR) | Label, Emission (MY13 D2) | 68320025AA |
| 1 (AR) | Label, Emission (MY13 DJ) | 68320024AA |
| 1 (AR) | Label, Emission (MY14 D2) | 68320027AA |
| 1 (AR) | Label, Emission (MY14 DJ) | 68320026AA |
| 1 (AR) | Label, Emission (MY15 D2) | 68320029AA |
| 1 (AR) | Label, Emission (MY15 DJ) | 68320028AA |
| 1 (AR) | Gasket, Injector | 04627714AA |
| 1 (AR) | Gasket, Flange | 68065844AB |
| AR | Isopropyl Alcohol | NPN |
NOTE: Isopropyl alcohol is considered shop supply (not on claim).
REPAIR PROCEDURE:
NOTE: The PCM must be at the latest calibration level after completing the repair procedure.
- Raise the vehicle on a suitable hoist and inspect all DEF hoses and hose connections for leaks or restrictions.
NOTE: Diesel exhaust fluid will form white deposits around leaky fittings.
- Were any exhaust fluid leaks found?
- Yes >>> This bulletin does not apply. Repair the fluid leak, using normal repair procedure in TechConnect and follow current warranty guidelines.
- No >>> Proceed to Step #3.
- Test the flow of the DEF injector by performing the following steps:
- Remove the DEF Injector from the decomposition tube, leaving the electrical connector plugged in and injector connected to the supply hose.
- Place the injector into a suitable container to capture the fluid that is sprayed during the injector quantity test.
- Using the wiTECH, perform the “DEF Reductant Doser Pump Override” test located in the PCM “System Tests”.
- Measure the amount of fluid sprayed after the test times out.
NOTE: This Test will run for six minutes before timing out. The amount of flow may fluctuate throughout the test, therefore the test must be allowed to run completely in order for the results to be accurate. The fluid should spray out as a mist. There should be no dripping from the holes in the DEF Injector at any time during the duration of the test procedure.
NOTE: Also, an injector may have white deposits on the tip that would appear to block the holes. These deposits are dry urea, they do not impact the injector performance and will wash off as soon as the injector is actuated. DO NOT replace the injector without running the bucket test first.
NOTE: During testing some residual fluid may collect on the DEF Injector. Do not replace an Injector for that reason alone. Run the entire volume flow test to determine a course of action.
- Was the amount of fluid captured between 85 ml and 115 ml (2.87 oz and 3.88 oz)?
- Yes >>> Proceed to Step #5.
- No >>> This bulletin does not apply. Further diagnosis of the DEF system is required.
- Test and inspect the DEF fluid for signs of contamination. Refer to detailed service procedures available in DealerCONNECT/TechCONNECT, Service Info Section 25 Emissions Control> Diesel Exhaust Fluid Emissions> Diagnosis And Testing> DIAGNOSIS AND TESTING – DIESEL EXHAUST FLUID. If found, repair as necessary following normal warranty repair guidelines.
NOTE: DEF fluid dilution or contamination is not covered under normal warranty.
- Were there any signs of DEF fluid contamination found?
- Yes >>> This bulletin does not apply. Repair the source of the contamination as needed per current warranty repair guidelines.
- No >>> Proceed to Step #7.
NOTE: The New SCR catalyst doesn’t use the ammonia sensor, remove and discard the sensor.
- Remove Ammonia sensor module. Refer to detailed service procedures available in DealerCONNECT/TechCONNECT 08 – Electrical/8E – Electronic Control Modules/MODULE, ammonia Sensor/Removal.
- The four wire connector for the ammonia module needs to be removed.
- Cut all four wire at the module connector and discard.
- Use the wire sleeve kit and seal all four cut wires.
- Secure (tape/ziptie) remaining wires to the main harness.
- Replace the SCR catalyst. Refer to detailed service procedures available in DealerCONNECT/TechCONNECT, Service Info Section 11- Exhaust System> Catalyst, Selective Catalytic Reduction (SCR)> Removal/Installation.
- Remove existing Vehicle Emission Control Information (VECI) label by hand.
NOTE: A heat gun may be needed to help remove the remaining adhesive.
- Remove any remaining label/adhesive using Isopropyl alcohol wipe and allow to dry.
- Position replacement label as near as possible to the original label.
- Remove all visible wrinkles and bubbles by wiping label with a gloved hand or asqueegee.
- Following all applicable published service bulletins, verify the PCM software is up to date.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
| Labor Operation No: | Description | Skill Category | Amount |
|---|---|---|---|
| 11-50-01-9Q | Test DEF System Only (2 – Skilled) | 10 – Diesel | 0.6 Hrs. |
| 11-50-01-9R | Test DEF System And Replace SCR Catalyst and Remove Ammonia Sensor (2 – Skilled) | 10 – Diesel | 1.7 Hrs. |
| 11-50-01-9U | Test DEF System And Replace SCR Catalyst and Remove Ammonia Sensor (With Transfer Case Skid Plate, Sales Code XEF) (2 – Skilled) | 10 – Diesel | 2.1 Hrs. |
FAILURE CODE:
| ZZ | Service Action |
18-088-15
- Mixture of 32.5 percent high purity synthetic urea and 67.5 percent deionized water
- Helps convert nitrogen oxide into harmless nitrogen gas and water vapor for cleaner emissions
- Improves fuel economy by up to 5 percent
- Inject the fluid into your exhaust stream with a specialized dosing module
- One gallon of is used approximately every 300 miles
- A truck with a 20 gallon DEF tank can go up to 6000 miles between fill-ups
- When used in an SCR system will reduce the levels of NOx emissions of those engines
- Fit type: Universal
- Pack of 30, Main image is for representation purpose only
- One gallon of is used approximately every 300 miles
- A truck with a 20 gallon DEF tank can go up to 6000 miles between fill-ups
- When used in an SCR system will reduce the levels of NOx emissions of those engines
- One gallon of BlueDEF is used approximately every 300 miles
- A truck with a 20 gallon DEF tank can go up to 6000 miles between fill-ups
- When used in an SCR system BlueDEF will reduce the levels of NOx emissions of those engines
- Non-flammable
- Diesel exhaust fluid
- A truck with a 20 gallon DEF tank can go up to 6000 miles between fill-ups
- This item does NOT ship free to residential, home business or farm addresses, please scroll down to confirm shipping details prior to purchase.
- SINOPEC Galance Aqueous Urea Solution AUS 32 is a API certified Diesel Exhaust Fluid. It is formulated using high purity urea and water. This product is a 32.5% solution designed for use in diesel engines with SCR technology. That is clear, non-toxic and safe to handle.
- Compare to: Peak BlueDef, Valvoline AdBlue, Shell Rotella
- Certifications: API Certified Diesel Exhaust Fluid DEF, ISO 22241, DIN V 70070, JIS 2247, BS ISO 22241
- Pack Size: 275 Gallon Tote
- Uses advanced system shield technology to reduce future deposits
- Maintains optimum fuel economy
- Sustains the life of your SCR system
- Compatible with all diesel SCR systems
- Tested to meet or exceed the strictest OEM standards
- Meets GM Original Equipment specifications to be approved for use in GM vehicles as well as in non-GM diesel vehicles that have an SCR (Selective Catalytic Reduction) system to meet regulated NOx emissions
- High quality formula is made from high purity urea and deionized water. It contains no chemical additives or other components that could cause SCR system failure
- Includes vented nozzle(s) that make pouring easy by helping to prevent glugging
- Has 1 complimentary nozzle. Extra nozzles sold separately
Last update on 2022-07-05 / Affiliate links / Images from Amazon Product Advertising API
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