In cold ambient conditions (10°F / –12°C), DTCs P30C3 and/or P30BF, P30C7 and P30CB may set on some 2019-2022 Silverado, Sierra; and 2020-2022 CT4 models equipped with the 2.7L engine (RPO L3B). These DTCs may be caused by a binding or sticking intake camshaft sliding lobe pack. (Fig. 10) This condition is most likely to occur on vehicles with less than 10,000 miles (16,000 km).
Fig. 10
If DTCs P30C3 (Intake Camshaft Profile Sleeve Position Sensor 2 Performance) and/or P30BF (Intake Camshaft Profile Sleeve Position Sensor Performance), P30C7 (Exhaust Camshaft Profile Sleeve Position Sensor Performance) and P30CB (Exhaust Camshaft Profile Sleeve Position Sensor 2 Performance) are set, follow the diagnostics in the appropriate Service Information. These DTCs will set when the Engine Control Module detects a difference between the actual and desired camshaft position angle.
If there is no trouble found with the lobe position sensors or wiring, replace the cam lobe position actuators, (Fig. 11, #2) based on the DTCs set.
Fig. 11
Replace the cam lobe position actuators for:
- P30BF – intake cylinders 1 and 2
- P30C3 – intake cylinders 3 and 4
- P30C7 – exhaust cylinder 2
- P30CB – exhaust cylinder 3
If the cam lobe position actuators were replaced previously and the fault returns, replace the intake camshaft (for DTC P30BF or P30C3) or exhaust camshaft (for DTC P30C7 or P30CB).
TIP: The intake and exhaust cam profile actuator solenoids are not interchangeable.
For more details, refer to #PIP5843A.
– Thanks to Robert Halas
