NHTSA ID Number: 10198859
Manufacturer Communication Number: 20NA161
Summary
This informational bulletin advises the technician to check for a possible stuck oil pressure relief valve.
8 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
CHEVROLET | 3500 | 2019 |
| CHEVROLET | EXPRESS | 2019-2020 |
| CHEVROLET | SILVERADO 2500 | 2019 |
| CHEVROLET | SUBURBAN | 2019 |
| GMC | SAVANA | 2019-2020 |
| GMC | SIERRA 2500 | 2019 |
Condition
Some customers may comment on one or more of the following conditions:
• MIL is illuminated.
• Oil Pressure Indicator on.
Some customers may also comment that the MIL illuminates and then turns off.
Some technicians may find DTC P0521 (Engine Oil Pressure Sensor Performance) active or stored in history in the Engine Control Module (ECM).
Cause
This condition may be caused by a sticking oil pressure relief valve within the oil pump assembly.
Correction
If you encounter a vehicle with the above DTC or conditions and before replacing any parts, it will be necessary to follow the steps below to determine what failure mode may exist and what the correct repair procedure is:
⇒ Remove the oil level indicator and confirm the oil level is at the full mark and not overfilled.
If oil level is full, it will be necessary to follow the steps below:
– Inspect the #1 main bearing for any damage.
• If the #1 main bearing is not damaged, then it will be necessary to replace the engine oil pump only.
• If the #1 main bearing is damaged but not spun it will be necessary to replace the crankshaft, main bearings, rod bearings and the engine oil pump.
• If the #1 main bearing was spun it will be necessary to replace the engine assembly.
When the applicable repair is complete road test vehicle to ensure engine is operating as designed.
Parts Information
| Description | Part Number | Qty |
| PUMP, OIL | 12696357 | 1 |
| ENGINE, GASOLINE (SERV NEW) L96 | 19256594 | 1 |
| ENGINE, GASOLINE (SERV NEW) LC8 | 12642269 | 1 |
| CRANKSHAFT, (CROSS DRILLED CRANK) | 12685656 | 1 |
| BEARING KIT, CR/SHF (STD) (#3) | 89017572 | 1 |
| BEARING KIT, CR/SHF (#1,2,4,5) (STD) | 89017571
General Motors, BEARING Kit, 89017571
| 4 |
| BEARING KIT, CONN ROD (STD) | 89017573
General Motors 89017573, Engine Connecting Rod Bearing
| 8 |
| GASKET, OIL PAN | 12612350
Oil Pan Gasket Set - Compatible with 4.8L 5.3L 6.0L 6.2L Chevy Silverado, Suburban, Tahoe, Trailblazer, GMC Sierra, Yukon, Cadillac Escalade - Replace 12612350 OS30693R
| 1 |
| SEAL, O/PMP SUC PIPE (0-RING) | 12584922
General Motors 12584922, Engine Oil Pump Pickup Tube Gasket
| 1 |
| HOUSING, CR/SHF RR OIL SEAL | 12639250
Sale
GM Genuine Parts 12639250 LS Rear Block Cover
| 1 |
| GASKET, CR/SHF RR OIL SEAL HSG | 12639249
GM Genuine Parts 12639249 Crankshaft Rear Oil Seal Housing Gasket
| 1 |
| BOLT, CR/SHF BALR (M16x2.0x103) | 12557840
GM Genuine Parts 12557840 Balancer Bolt
| 1 |
| STUD, CR/SHF BRG CAP (HFH, M10x2x23) | 12560273
GENERAL MOTORS 12560273 SSTUD
| 10 |
| BOLT, CR/SHF BRG CAP (SIDE) (SHORT) (M8x1.25×11) | 12556127 | 10 |
| BOLT, CR/SHF BRG CAP (M10x2x102.5) | 12560272 | 10 |
| GASKET, ENG FRT CVR | 12633904 | 1 |
SEOCONTENT-START
Service Bulletin Bulletin No.: 20-NA-161 Date: May, 2021 INFORMATION Subject: Information on Engine Low Oil Pressure Indicator on the Driver Information Center (DIC) – DTC P0521 Set Brand: Model: Model Year: Date Breakpoint: Engine: Transmission: from to from to Chevrolet Express 2019 2020 – – 6.0L (L96 LC8) – 3500/4500 Medium Duty (LCF) 2019 Silverado 2500/3500 2019 Suburban 2019 GMC Savana 2020 Sierra 2500/3500 2019 Involved Region or Country North America, Middle East, Iraq, Israel, Palestine, Chile (West), Peru (West), Thailand (ASEAN) Condition Some customers may comment on one or more of the following conditions: • MIL is illuminated. • Oil Pressure Indicator on. Some customers may also comment that the MIL illuminates and then turns off. Some technicians may find DTC P0521 (Engine Oil Pressure Sensor Performance) active or stored in history in the Engine Control Module (ECM). Cause This condition may be caused by a sticking oil pressure relief valve within the oil pump assembly. Correction If you encounter a vehicle with the above DTC or conditions and before replacing any parts, it will be necessary to follow the steps below to determine what failure mode may exist and what the correct repair procedure is: ⇒ Remove the oil level indicator and confirm the oil level is at the full mark and not overfilled. If oil level is full, it will be necessary to follow the steps below: – Inspect the #1 main bearing for any damage. • If the #1 main bearing is not damaged, then it will be necessary to replace the engine oil pump only. • If the #1 main bearing is damaged but not spun it will be necessary to replace the crankshaft, main bearings, rod bearings and the engine oil pump. • If the #1 main bearing was spun it will be necessary to replace the engine assembly. When the applicable repair is complete road test vehicle to ensure engine is operating as designed. Page 2 May, 2021 Bulletin No.: 20-NA-161 Parts Information Causal Part Description Part Number Qty X PUMP, OIL 12696357 1 N/A ENGINE, GASOLINE (SERV NEW) L96 19256594 1 N/A ENGINE, GASOLINE (SERV NEW) LC8 12642269 1 N/A CRANKSHAFT, (CROSS DRILLED CRANK) 12685656 1 N/A BEARING KIT, CR/SHF (STD) (#3) 89017572 1 N/A BEARING KIT, CR/SHF (#1,2,4, 5) (STD) 89017571 4 N/A BEARING KIT, CONN ROD (STD) 89017573 8 N/A GASKET, OIL PAN 12612350 1 N/A SEAL, O/PMP SUC PIPE (0-RING) 12584922 1 N/A HOUSING, CR/ SHF RR OIL SEAL 12639250 1 N/A GASKET, CR/ SHF RR OIL SEAL HSG 12639249 1 N/A BOLT, CR/SHF BALR (M16x2.0x103) 12557840 1 N/A STUD, CR/SHF BRG CAP (HFH, M10x2x23) 12560273 10 N/A BOLT, CR/SHF BRG CAP (SIDE) (SHORT) (M8x1.25×11) 12556127 10 N/A BOLT, CR/SHF BRG CAP (M10x2x102.5) 12560272 10 N/A GASKET, ENG FRT CVR 12633904 1 Bulletin No.: 20-NA-161 May, 2021 Page 3 Warranty Information Note: Only use the Labor Operation number that coincides with the repair performed. For vehicles repaired under warranty, use: Labor Operation Description Labor Time 4066070 Oil Pump Replacement Use the Published Labor 4067490 Engine Replacement Operations Time 4066750 Crankshaft Replacement Version 2 Modified Released November 30, 2020 Revised May 10, 2021 – Removed the Breakpoint Date, Changed the Correction section information and added #3 Crankshaft Bearing Part to Parts Information section.
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 20-NA-161
Date: May, 2021
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