Some low-mileage 2022 Silverado, Sierra and CT4-V models equipped with the 2.7L turbocharged engine (RPO L3B) may have DTC P30BF (Intake Camshaft Profile Sleeve Position Sensor Performance) set in the Engine Control Module and an illuminated Check Engine MIL. The affected engines usually have less than 5,000 miles (8,000 km).
If these conditions are found, the cylinder 1 / 2 sliding lobe pack may be binding on the intake camshaft of the Sliding Cam Valve Lift system. (Fig. 18)
The Sliding Cam Valve Lift system enables the Engine Control Module to change the camshaft lift profile of the intake and exhaust camshafts while the engine is running to enhance performance and efficiency. Each camshaft has two profile sleeves with different height cam lobes and a detent ball and spring under each sleeve that helps hold the profile sleeve into position. The profile actuator solenoids push out an actuator guide pin into the shifting groove machined into the camshaft lift profile sleeve. When the guide pin engages the sleeve, it causes it to shift axially on the camshaft, causing the unique-sized cam lobes to be placed over the intake and exhaust valves and modify valve lift and duration.
Fig. 18
Follow the diagnostics in the appropriate Service Information for DTC P30BF. If the diagnostics are inconclusive, replace the intake camshaft (Fig. 19), intake cam actuator and actuator solenoid valve bolt.
Once repairs are completed, clear any DTCs and evaluate engine operation.
Fig. 19
– Thanks to Robert Halas
