Replace the camshaft position sensor on the 2014-2018 Chevrolet Silverado 1500 5.3L V8 EcoTec3 L83 engine to restore proper engine timing signal and resolve related fault codes.

Warnings

Tools required

Parts

• Camshaft Position Sensor × 1 — ACDelco 213-3521 or equivalent
• Camshaft Position Sensor O-ring × 1 — Usually included with sensor

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely
3. Disconnect negative battery terminal to prevent accidental cranking
4. If codes are present, document them with an OBD-II scanner for comparison after repair
5. Locate camshaft position sensor on rear of engine block, passenger side, near distributor location on older engines

Procedure

1. 1

   Access the camshaft position sensor
   Position yourself to access the rear of the engine compartment on the passenger side. The camshaft position sensor is mounted in the engine block behind the intake manifold, near the rear of the cylinder head. Use a flashlight to locate the sensor and its electrical connector. You may need to reach down between engine components from above.
2. 2

   Disconnect electrical connector
   Locate the electrical connector on the camshaft position sensor. Press the release tab on the connector and pull straight away from the sensor. If the connector is difficult to release, use a pick tool to depress the locking tab. Inspect the connector terminals for corrosion or damage.
3. 3

   Remove sensor retaining bolt
   Using a 10mm socket with extension, remove the single bolt securing the camshaft position sensor to the engine block. The bolt is typically located at the top of the sensor body. Keep the bolt in a safe location for reinstallation or replacement.
4. 4

   Extract camshaft position sensor
   Carefully pull the sensor straight out of the engine block bore. You may need to rotate the sensor slightly while pulling to break it free. If the sensor is stuck, gently wiggle it side-to-side while pulling outward. Do not pry against the engine block or use excessive force as this may damage the bore.
   ⚠The sensor bore seals with an O-ring; ensure the old O-ring comes out with the sensor and does not remain in the bore
5. 5

   Inspect sensor bore and clean
   Once the sensor is removed, inspect the bore in the engine block for debris, old O-ring material, or metal shavings. Use a shop towel to clean the bore opening. If accessible, lightly spray brake cleaner into the bore and wipe clean. Ensure no debris falls into the engine. Inspect the old sensor for metal shavings on the tip which may indicate internal engine wear.
6. 6

   Prepare new sensor
   Remove the new camshaft position sensor from packaging and verify it matches the old sensor. Check that a new O-ring is installed on the sensor body. Lightly lubricate the O-ring with clean engine oil to ease installation and prevent tearing. Do not use excessive oil or grease.
7. 7

   Install new camshaft position sensor
   Carefully insert the new sensor into the engine block bore, ensuring proper alignment. Push the sensor in by hand until it seats fully against the engine block mounting surface. The sensor should slide in smoothly without excessive force. Ensure the mounting hole in the sensor aligns with the threaded hole in the block.
8. 8

   Install and torque retaining bolt
   Thread the retaining bolt by hand to ensure proper thread engagement. Using a torque wrench and 10mm socket, tighten the bolt to the specified torque value. Do not overtighten as this may crack the sensor housing.
   Torque spec

   Camshaft Position Sensor10 Nm (7 lb-ft)
9. 9

   Reconnect electrical connector
   Clean the electrical connector terminals with electrical contact cleaner if needed. Push the connector firmly onto the sensor until you hear or feel a click indicating the locking tab has engaged. Gently tug on the connector to verify it is securely locked.
10. 10

    Reconnect battery and clear codes
    Reconnect the negative battery terminal. If using an OBD-II scanner, clear any stored camshaft position sensor codes. If no scanner is available, the codes will clear after several successful drive cycles.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify no tools or parts were left in the engine compartment
3. Double-check that the sensor retaining bolt is properly torqued

Verification

• Start the engine and verify it runs smoothly without rough idle or hesitation
• Check that the check engine light does not illuminate after starting
• Use an OBD-II scanner to verify no camshaft position sensor codes are present (P0340, P0341, P0342, P0343)
• Take the vehicle for a short test drive to confirm normal operation and no warning lights
• Recheck for codes after test drive to ensure repair was successful

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