why does my GMC Sierra T1XX (2019-Present) have low oil pressure?

Learn how to diagnose and fix low oil pressure in GMC Sierra T1XX (2019-Present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical issues.

2. Check and Replace Oil

• Tools Required: Socket set, oil filter wrench, drain pan
• Remove the oil drain plug and drain the old oil into the pan.
• Replace the oil filter using the oil filter wrench.
• Install a new oil filter, ensuring the rubber gasket is lubricated with clean oil.
• Reinstall the oil drain plug and tighten to the manufacturer's torque specification (usually around 20-25 lb-ft).
• Fill the engine with the correct type and amount of new oil (consult the owner's manual for specifications).

3. Inspect and Replace Oil Pressure Sending Unit

• Tools Required: Socket set, screwdriver, torque wrench
• Locate the oil pressure sending unit, typically near the oil filter or on the engine block.
• Disconnect the electrical connector and remove the sending unit using a socket.
• Install the new oil pressure sending unit and tighten it to the specified torque.
• Reconnect the electrical connector.

4. Oil Pump Inspection (if necessary)

• Tools Required: Socket set, torque wrench, gasket scraper
• Remove any components obstructing access to the oil pump (such as timing covers).
• Inspect the oil pump for wear, damage, or clogging.
• Replace the oil pump if worn or damaged, using a new gasket and following torque specifications for installation.