20NA110
Service Bulletin Details
Public Details for: 20NA110
This service bulletin advises the technician on what to do if the def pump has been replaced and perform a leak test to prime the pump.
- 2021 - 2020 - 2019 - 2018 - 2017 - 2016 -
Models from 2021
Models from 2020
Models from 2019
Models from 2018
Models from 2017
Models from 2016
2016 CHEVROLET COLORADO |
2016 GMC CANYON |
Bulletin No.: Service Bulletin Date: 20-NA-110 August, 2021 INFORMATION Subject: Information on Diesel Exhaust Fluid (DEF) Pump Unable to Build Pressure After Replacement Attention: Only perform this procedure after replacing the DEF pump and the system does not build pressure (does not prime). Brand: Model: Cadillac Chevrolet GMC Model Year: VIN: from to Engine: (Diesel) from to Escalade Models 2021 2022 LM2 Colorado 2016 2021 LWN Cruze 2017 2020 LH7 Express 2017 2021 LWN Equinox 2018 2019 LH7 Silverado 2017 2018 L5P Silverado 1500 (New Model-12th VIN=7) 2019 2019 LM2 Silverado 1500 2020 2021 LM2 Silverado 2500/3500 2019 2021 L5P Silverado 4500HD/ 5500HD/6500HD 2019 2021 Silverado LD 2019 2019 — — L5D Transmission: — LM2 Tahoe 2021 2022 LM2 Canyon 2016 2021 LWN Savana 2017 2021 LWN Sierra 2017 2018 L5P Sierra 1500 2020 2021 LM2 Sierra 2500/3500 2019 2021 L5P Sierra Limited 2019 2019 LM2 Terrain 2018 2019 LH7 Yukon Models 2021 2022 LM2 Involved Region or Country North America, Middle East, Israel, Palestine, Argentina, Brazil, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay, China, Thailand, Egypt, Other Africa, Australia/New Zealand Condition Some technicians may comment that after replacing the DEF pump, the pump will not build pressure and one or more of the following DTCs may set: • P20E8: Reductant Low Pressure • P249C: Excessive Time To Enter Closed Loop Reductant Injection Control Copyright 2021 General Motors LLC. All Rights Reserved. Page 2 August, 2021 Bulletin No.: 20-NA-110 If after replacing the DEF pump, the system is unable to build pressure, inspect for any leaks, loose connections or kinks in the supply line. After performing an initial leak test three times, if low pressure is present, this may be because the DEF pump filter has dried out. Allow the vehicle to sit overnight with the new pump and DEF fluid to re-saturate the DEF pump filter. In the morning, perform the leak test three additional times. The pump should now be able to build pressure. Information Parts Information No parts are required for this repair. Warranty Information Important: This Labor Operation should not be used for initial diagnosing of low system pressure. This Labor Operation should only be used if after the emission reductant fluid tank (4025130 Emission Reduction Fluid Tank Replacement) or the emission reductant fluid pump (4029820 Emission Reduction Fluid Supply Pump Module Replacement) has been replaced and the system will not build pressure. Important: Only apply the additional labor time if the vehicle requires overnight soak time and re-test. For vehicles repaired under the Emission coverage (Coverage Code E), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. Labor Operation 4087458* Description Labor Time Perform DEF Pump Pressure Test 0.4 hr *This is a unique Labor Operation for bulletin use only. Version 4 Modified Released June 11, 2020 October 13, 2020 – Added the Attention statement, 2016 Model Year to Colorado and Canyon, updated the Involved Region or Country section, added first Important statement under Warranty Information and updated the warranty coverage statement. January 11, 2021 – Added the 2021 Model Year and removed Korea. August 20, 2021 – Added the 2021-2022 Cadillac Escalade, Chevrolet Tahoe and GMC Yukon models and Australia/New Zealand to the Involved Region or Country section. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION