how to fix Cadillac Escalade T1XX (2021-Present) oil pressure warning light

Symptoms

• Oil pressure warning light illuminated on the dashboard
• Engine running louder than usual
• Decreased engine performance or power
• Engine oil leaks observed under the vehicle
• Poor fuel economy

Diagnostic Steps

1. Check the oil level using the dipstick; ensure it is within the recommended range.
2. Scan the vehicle's OBD-II system for any error codes related to oil pressure or engine performance.
3. Inspect the oil pressure sending unit for signs of damage or leaks.
4. Check for any visible oil leaks around the oil pan and oil filter.
5. Test the oil pressure using a mechanical oil pressure gauge to determine if the reading is within specifications.
6. Inspect the oil for contamination or degradation, which may indicate needed replacement.

Solution

1. Preparation

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

2. Check and Top Off Engine Oil

• Remove the oil filler cap.
• Use a funnel to add the appropriate type and amount of engine oil as specified in the owner’s manual.

3. Replace Oil Pressure Sending Unit

• Tools Required: Socket set, torque wrench, oil catch pan.
• Locate the oil pressure sending unit; it is typically near the oil filter.
• Disconnect the wiring harness from the sending unit.
• Remove the sending unit using the socket set.
• Install the new sending unit and tighten to the manufacturer's recommended torque specifications (usually around 20 ft-lbs).
• Reconnect the wiring harness.

4. Change Engine Oil and Filter

• Tools Required: Oil filter wrench, socket set, oil catch pan.
• Place the oil catch pan under the engine.
• Remove the oil drain plug and allow the old oil to fully drain.
• Replace the oil drain plug securely.
• Use the oil filter wrench to remove the old oil filter.
• Apply a little new oil to the rubber gasket of the new filter and install it.
• Fill the engine with new oil through the oil filler cap.

5. Reset Oil Pressure Warning Light

• Reconnect the vehicle's battery.
• Start the engine and let it idle.
• Check for any warning lights on the dashboard. If the oil pressure warning light remains on, it may require further diagnosis.