GMC Error Code P0021: How to Fix It

Q: What causes GMC P0021 error code?

P0021 is typically caused by a faulty VVT solenoid, stretched timing chain, worn timing chain guides, clogged oil passages in the camshaft actuator, or low/dirty engine oil affecting the Variable Valve Timing system.

Q: Can I drive my GMC with P0021 code?

You can drive short distances, but avoid prolonged driving or high RPMs. P0021 can cause poor fuel economy, rough idling, and potential engine damage if left unrepaired. Address the issue promptly.

Q: How much does it cost to fix P0021 on a GMC?

Repair costs range from $150-300 for VVT solenoid replacement, $300-600 for camshaft actuator replacement, or $800-1500+ for timing chain replacement depending on your GMC model and labor rates.

Q: Will changing oil fix P0021 code?

If the code is caused by low, dirty, or wrong viscosity oil, an oil change may resolve P0021. However, if components like the VVT solenoid or timing chain are damaged, replacement parts will be needed.

Q: What's the difference between P0021 and P0011?

P0021 affects bank 2 intake camshaft timing, while P0011 affects bank 1. Bank 2 is typically the passenger side on V6/V8 GMC engines, while bank 1 is the driver's side.

Abstract

GMC error code P0021 indicates that the intake camshaft position timing is over-advanced on bank 2 of your engine. This means the Variable Valve Timing (VVT) system is not controlling the camshaft properly, which can cause rough idling, poor fuel economy, and reduced engine performance.