2001 Chevy Silverado 4.3L P0335 Fault Code After Intake Manifold Gasket Replacement
My 2001 Chevy Silverado with a 4.3L engine was previously running smoothly, but started leaking coolant from the lower intake manifold. I replaced all relevant gaskets using Felpro products and successfully resolved the leak. Since then, the vehicle has begun displaying a P033-than error code. I have already replaced the crankshaft position (CKP) sensor, yet the fault remains as a pending P0335. The wiring appears intact, and I've checked connections according to the manufacturer's diagram. I've noticed a significant drop in oil pressure, which may be due to sludge buildup from prior engine conditions. However, the truck was running well before the gasket replacement—so I'm concerned that the repair might have triggered or exacerbated an underlying issue. What could be causing this P0335 error after the gasket work? Is there a connection between intake manifold repairs and crankshaft sensor performance? Thanks for any insights!
Did you perform a Crankshaft Position System Variation Learn procedure after installing the new CKP sensor? This is often required to reset the engine control module and ensure proper sensor calibration. Does your code reader (e.g., Torque Pro) display all fault codes, including manufacturer-specific ones such as P0999 or higher? Lower oil pressure could also be related to distributor installation—was it properly seated and secured during repair? Please inspect the wiring harness connections for the CKP sensor. Refer to the official wiring diagram showing both CMP (camshaft position) and CKP sensors, typically found on the third page of the service manual. Resource: http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=28883