what can cause the p0011 p0017 and p0021 codes to come up on my 2012 chevy impala

P0021 is a mutual trouble lawmaking. Information technology affects vehicles with variable valve timing (VVT). The list of VVT vehicles is growing, and the Chevy Impala tin can have VVT, and is prone to developing this code.

P0021 is a generic OBDII lawmaking. This means that information technology has the same definition regardless of the make or model of the vehicle. It has the same definition for the Chevy Impala every bit it does on any other vehicle. Banking company 2 refers to the issue existence on the side of the engine with cylinder two in the firing gild. For the side of the engine with cylinder 1, the code would exist P0011.

VVT changes the frequency and distribution of gases entering and exiting the combustion chamber. It allows the engine to deed as though information technology has different camshaft profiles at different RPM'due south. This is bang-up for both ability and fuel economic system.

P0021 Definition Chevy Impala

The Chevy Impala utilizes camshaft actuators to alter the valve lift depending on the RPM of the motor. This allows for a more than efficient cam profile at any speed. When the timing is too far avant-garde

Camshaft Position Actuators change the lift of the camshaft upwardly to 25 degrees. They are hydraulic, which means that they employ the vehicle's engine oil to control elevator. So, if y'all have low oil pressure or dirty oil, information technology can keep them from doing their job properly, and trigger P0021.

With P0021, the camshaft actuator is leaving the timing too far advanced, or in that location is a arrangement performance issue (not working right).

Chevy Impala P0021 Symptoms

When the timing is besides far avant-garde, it can actually crusade some issues with the motor. Hither are some of the typical symptoms of P0021 in the Chevy Impala:

• Poor Idle Quality– If the camshaft actuator fails while giving the engine aggressive valve timing, it'll idle roughly.
• Decreased Gas Mileage– Now the engine tin can no longer adjust its cam timing on the wing, it will no longer be able to produce optimal combustion which equals poor economy.
• Lost Power– The engine will not be able to produce as much power. This is because the cam contour volition not allow it run a operation power curve when you lot need more power.
• Service Engine Soon Light– Most of the time, you'll be able to feel or see one of the above symptoms, but if you can't, the service engine before long light will yet come on and let you know that something is wrong.
• Tough to First Motor– With the timing too far advanced, it is going to be difficult to start the motor, especially when information technology is warm.

Possible Impala P0021 Causes

There are quite a few unlike things that can cause the P0021. Here are the most mutual causes:

• Engine Timing– If the camshaft(southward) are no longer synced to the crank properly (such equally if the timing concatenation jumped a tooth), it can cause the engine timing to be off enough to throw the P0021 fifty-fifty though information technology's not the Actuator's error. Here's more than on that from this site: Timing Chain Jumped Symptoms and Diagnosis
• Engine Oil– If the engine oil is dirty or low, information technology may cause the actuator to role improperly. Also, the oil viscosity tin can be off
• Bad Intake Camshaft Position Actuator Solenoid– The actuator solenoid itself can go bad over time. You lot certainly don't want to start here, since a lot of the fourth dimension it'll exist something else that causes the P0021 to appear. Here'southward a proficient video of someone replacing i, so you can see what goes into information technology. If you find you demand i, they typically aren't that expensive.
• Wiring Issues– The wiring going from the solenoid to the ECM can get damaged or cleaved. This will throw the P0021 OBDII lawmaking. The wiring harness to the intake camshaft position sensor may also develop a poor connectedness. YouTube: How to Discover an Open or Short the Fast Piece of cake Way.
• Bad ECM (highly unlikely)- If the Impala's computer goes bad, then it may throw this code forth with other bug. Here's how to tell if you lot accept a bad ECM Autoblog: Symptoms of a Bad ECM.

Here'south a phenomenal video on how to test a cam/crank actuator. It's on the folio instead of a link because it'south that worth watching. Always make certain that you check everything else that y'all can before actually opening up an engine.

Conclusion

If it has been an excessive flow of time since the concluding time that you've had an oil alter, or you find that at that place may be reason to believe that the oil thickness is wrong, change the oil and see if that helps anything. Good luck diagnosing the P0021 in your Chevy Impala. If y'all would like to add annihilation, please exit a comment below.

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Source: https://www.700r4transmissionhq.com/p0021-chevy-impala/