Oil Pressure Sensor

This procedure covers the removal and replacement of the oil pressure sensor on the 2014-2018 Chevrolet Silverado 1500 with the 5.3L V8 EcoTec3 L83 engine.

Warnings

Tools required

Parts

• Oil pressure sensor × 1 — ACDelco 12621234 or equivalent
• Thread sealant (GM P/N 12377953 or equivalent) × 1 — GM P/N 12377953

Fluids

• ACDelco dexos1 0W-20 — 0.5 qt

Preparation

1. Park vehicle on level ground and engage parking brake
2. Allow engine to cool completely if recently operated
3. Disconnect negative battery cable to prevent electrical issues
4. Raise vehicle using a floor jack and support on jack stands if additional clearance is needed
5. Locate the oil pressure sensor on the driver's side of the engine block, behind the alternator and near the oil filter housing

Procedure

1. 1

   Access the oil pressure sensor
   Position yourself under the driver's side of the vehicle. The oil pressure sensor is mounted on the engine block below the exhaust manifold. You may need to remove any skid plates or under-engine covers for better access. Use a flashlight to clearly identify the sensor and its electrical connector.
2. 2

   Disconnect the electrical connector
   Locate the electrical connector attached to the oil pressure sensor. Press the release tab on the connector and pull it straight off the sensor. Inspect the connector for any corrosion or damage. If the connector is difficult to access, you may need to maneuver it carefully around nearby components.
3. 3

   Position drain pan
   Place a drain pan directly beneath the oil pressure sensor. When the sensor is removed, residual oil from the engine block will drain out. Position the pan to catch approximately half a quart of oil.
4. 4

   Remove the old oil pressure sensor
   Using the oil pressure sensor socket (typically 1-1/16" or 27mm deep socket), loosen and remove the sensor by turning counterclockwise. Be prepared for oil to begin dripping immediately. Remove the sensor completely and allow oil to drain into the pan. Keep shop rags nearby to manage any spillage.
5. 5

   Clean the mounting surface
   Once oil has stopped dripping, clean the sensor mounting hole threads in the engine block using a wire brush or clean shop rag. Remove any old thread sealant, debris, or metal particles. Ensure the threads are clean and undamaged. Inspect the area for any signs of cracks or damage to the block.
6. 6

   Prepare the new sensor
   Apply a thin, even coating of thread sealant to the threads of the new oil pressure sensor. Do not apply sealant to the first 1-2 threads to prevent it from being pushed into the oil passage. Use only the specified GM thread sealant or equivalent to ensure proper sealing and prevent contamination.
7. 7

   Install the new oil pressure sensor
   Thread the new sensor into the engine block by hand, turning clockwise. Ensure it threads smoothly without cross-threading. Once hand-tight, use the oil pressure sensor socket and torque wrench to tighten to specification. Do not over-tighten as this can damage the sensor or engine block threads.
   Torque spec

   Oil Pressure Sensor20 Nm (15 lb-ft)
8. 8

   Reconnect the electrical connector
   Push the electrical connector firmly onto the new oil pressure sensor until you hear or feel a positive click. Tug gently on the connector to ensure it is securely locked in place. Verify the connector seal is properly seated to prevent moisture intrusion.
9. 9

   Check engine oil level
   Remove the engine oil dipstick and check the oil level. Add ACDelco dexos1 0W-20 engine oil as needed to bring the level to the full mark on the dipstick. Account for the oil that was lost during sensor removal (approximately 0.5 quart).
10. 10

    Reinstall covers and lower vehicle
    Reinstall any skid plates or under-engine covers that were removed for access. If the vehicle was raised, carefully lower it from the jack stands. Reconnect the negative battery cable.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify no tools or rags were left in the engine bay
3. Double-check that the oil level is correct on the dipstick

Verification

• Start the engine and verify the oil pressure warning light extinguishes within 2-3 seconds
• Allow the engine to idle for several minutes while monitoring for oil leaks around the sensor
• Check that the oil pressure gauge (if equipped) shows normal pressure reading
• Use a scan tool to verify the oil pressure sensor is providing a realistic pressure reading (typically 30-60 PSI at idle when warm)
• Turn off the engine and perform a final visual inspection for any oil seepage around the sensor threads
• Clear any diagnostic trouble codes related to oil pressure if they were present before the repair

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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