20NA179
Service Bulletin Details
Public Details for: 20NA179
- 2020 -
Models from 2020
2020 CHEVROLET CORVETTE |
Bulletin No.: Service Bulletin Date: 20-NA-179 October, 2020 TECHNICAL Subject: Malfunction Indicator Lamp (MIL) Illuminated – DTCs P0521 and/or P06DD Set Brand: Model: Chevrolet Corvette Model Year: VIN Breakpoint: from to from to 2020 2020 SORP September 10, 2020 Engine: Transmission: 6.2L (LT2) — Involved Region or Country North America Condition Some customers may comment that the MIL is illuminated. Some customers may also comment that the MIL will illuminate and then shut off. Some technicians may find one or more of the following DTCs set in the Engine Control Module (ECM): • P0521: Engine Oil Pressure Sensor Performance • P06DD: Engine Oil Pressure Control Valve Performance Cause This condition may be caused by an unseated engine oil pressure control valve (OCV). Correction 5633411 Note: If a vehicle comes in with one of these DTCs, follow SI for both DTCs to ensure there is not an electrical fault or other hardware concern. After diagnosis has been performed and no issues are found electrically, then it will be necessary to remove the engine oil pan and inspect for a unseated engine oil pressure control valve, which is mounted on the bottom of the engine oil pump. If P0521 and P06DD DTCs are present, then a redesigned oil pressure control valve retainer clip (1) may be necessary. Refer to the Service Procedure section below. Copyright 2020 General Motors LLC. All Rights Reserved. Page 2 October, 2020 Bulletin No.: 20-NA-179 Service Procedure 1. Remove the engine oil pan. Refer to Oil Pan Replacement in SI. 5633412 Note: The generator may need to be repositioned to gain access to the main cap side bolts. 2. Remove the main cap side bolts (1). Important: When removing the main bearing cap be careful not to damage the main bearing or journal surface of the crankshaft. Please set the main bearing cap in a safe place so no debris or damage could occur. 3. Remove and discard the bolts (2) that secure the #1 main bearing cap. 5633444 4. Inspect the OCV: • If you find this oil pressure control valve dislodged (1), it will be necessary to install a redesigned oil control valve retainer. 5. Disconnect the oil pressure control valve electrical connector and position aside. Bulletin No.: 20-NA-179 October, 2020 Page 3 Important: Do not use any tools to tap the pressure control valve into place. Only install the pressure control valve by pushing on the body of the valve by hand. 8. Install the new retainer from the front of engine towards the rear as shown in the graphic above. 5633443 Note: Remove the existing oil pressure control valve retainer by pulling towards the rear and discard. You will be installing a newly designed retainer during installation. 6. Push in the retainer and remove the oil pressure control valve and set aside. 7. Once the retainer is removed, inspect the oil pressure control valve for any signs of damage and ensure the O-ring is not cut. ⇒ Apply a small amount of clean engine oil to the pressure control valve and reinstall ensuring it is seated correctly. 5633895 9. When the retainer is installed, there should be about 2 to 3 mm of clearance between the retainer and the oil pump body as shown above. ⇒ Ensure the pressure control valve and retainer are correctly installed. 10. Ensure the cap and bearing are VERY CLEAN and apply assembly lube prior to installation. 11. Install the front main bearing cap with new bolts. Tighten Tighten the bolts to specifications. Refer to Fastener Specifications in SI. 12. If removed, install the generator. 13. Install the engine oil pan. Refer to Oil Pan Replacement in SI. 5633451 Page 4 October, 2020 Bulletin No.: 20-NA-179 Parts Information Warranty Information Important: **The Oil Pump Control Valve (OCV) Retainer can be obtained from the Warranty Parts Center (WPC) using the TSP Dealer Request Form located on Global Connect