P0021
Fix within a few daysYour engine's computer detects that the intake camshaft on Bank 2 is too far advanced or not responding correctly to timing adjustments.
Code P0021 means your engine's Bank 2 intake camshaft timing is over-advanced. Common causes: Low/dirty engine oil (40%), VVT solenoid (40%), cam phaser (15%). Drivability: Limit driving, fix within a few days. Repair cost: $50-$400 DIY, $100-$1200 professional.
Can I Drive With P0021?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy acceleration. Get it fixed promptly.
Stop driving immediately if: Flashing Check Engine Light, loud engine knocking, significant power loss, or engine stalling.
Symptoms of P0021
- 1Rough idle or stalling
- 2Reduced engine power or acceleration
- 3Poor fuel economy
- 4Engine knocking or ticking noises
- 5Hard starting
Common Causes of P0021
Parts most likely causing this code, ranked by probability
The Variable Valve Timing (VVT) system relies on clean, sufficient oil pressure to operate the cam phasers.
40% of P0021 cases are fixed by an oil change
This solenoid controls the oil flow to the cam phaser, and if it's stuck or faulty, it cannot adjust timing correctly.
40% of P0021 cases are fixed by replacing this solenoid
The phaser is the mechanical component that physically adjusts the camshaft timing, and it can fail internally or get clogged with sludge.
15% of P0021 cases are fixed by replacing this phaser
Damaged wiring or a corroded connector to the VVT solenoid can prevent proper electrical signals.
4% of P0021 cases are fixed by repairing wiring
A faulty ECM/PCM can misinterpret sensor data or fail to send correct commands to the VVT system.
1% of P0021 cases are fixed by replacing the ECM
Check These First (Before Buying Parts)
- Check your engine oil level and condition. Low or dirty oil is a very common cause of VVT system malfunctions. Top off or change oil if needed.
- Inspect the electrical connector and wiring going to the Bank 2 intake VVT solenoid for any visible damage, corrosion, or loose connections.
How to Diagnose P0021
- 1Check engine oil level and condition; perform an oil change if necessary.
- 2Inspect the VVT solenoid (Bank 2 Intake) wiring and connector for damage or corrosion.
- 3Test the VVT solenoid's electrical resistance and operation (often requires a scan tool to command it on/off).
- 4Remove and visually inspect the VVT solenoid for sludge or debris blocking its screen.
- 5If the solenoid is good, consider checking engine oil pressure and inspecting the camshaft phaser for internal issues (more involved).
P0021 on Popular Vehicles
Toyota Camry
2007-2024Toyota's VVT-i systems are sensitive to oil quality. Neglected oil changes can lead to sludge buildup, clogging VVT solenoids or cam phasers. Solenoid replacement is a common fix.
70% fixed by VVT solenoid or oil change
Honda Accord
2003-2024Honda's VTEC/VTC systems can trigger P0021 due to clogged VTC oil control solenoids or screens. Always check oil level and condition first.
65% fixed by VVT solenoid or oil change
Ford F-150
2004-2024Ford's 3-valve Triton engines (5.4L, 4.6L) are notorious for cam phaser issues, often leading to P0021. This is frequently linked to oil pressure problems or worn phasers themselves. Solenoids are also common failures.
80% fixed by cam phaser or VVT solenoid replacement
Frequently Asked Questions
What does P0021 mean?
P0021 indicates that your engine's computer has detected an issue with the intake camshaft timing on Bank 2, specifically that it is over-advanced or not performing as expected.
Can I drive with P0021?
Yes, for short trips only. You can drive your vehicle to a repair shop or home, but limit driving. Continued driving can lead to reduced power, poor fuel economy, and potential engine damage if the issue is severe.
Will P0021 clear itself?
No, P0021 will not clear itself. The underlying mechanical or electrical issue needs to be addressed. Once the repair is made, you will need to clear the code with an OBD-II scanner.
How do I fix P0021 myself?
Start by checking your engine oil level and condition; an oil change is often the first step. If that doesn't work, you can usually replace the Bank 2 intake VVT solenoid yourself with basic hand tools. Replacing the cam phaser is a more involved repair.
How much does it cost to fix P0021?
DIY costs range from $50 (for an oil change and possibly a VVT solenoid) to $400 (if a cam phaser is needed). Professional repair costs typically range from $100 (for an oil change) to $1200 (for a cam phaser replacement, including labor).
P0021 keeps coming back - why?
P0021 often returns if the root cause wasn't fully addressed. This can happen if you only changed the oil but the VVT solenoid is still faulty, or if you replaced the solenoid but the cam phaser is actually stuck or the engine has internal sludge issues.
Will P0021 fail emissions/smog test?
Yes, P0021 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on automatically fails the test, and issues with valve timing directly impact emissions.
What's the difference between P0021 and P0011?
P0021 refers to an issue with the 'A' (intake) camshaft position on Bank 2 (the side of the engine that does not contain cylinder #1). P0011 refers to the same issue but on Bank 1 (the side of the engine that contains cylinder #1).
P0021 on Ford F-150?
On many Ford F-150s, especially those with the 3-valve 5.4L engine, P0021 is commonly associated with failing cam phasers or VVT solenoids, often exacerbated by insufficient oil pressure or neglected oil changes. These engines are particularly sensitive to oil quality and pressure for VVT operation.
Questions to Ask Your Mechanic
Did you check the engine oil level and condition before diagnosing the VVT system?
Good answer: Yes, that's always the first step. The oil was [level/condition], and we performed an oil change before proceeding.
What were the live data readings for the Bank 2 intake camshaft position and commanded position?
Good answer: The actual position was showing [X degrees] while the commanded was [Y degrees], indicating it was stuck or over-advanced. This helped us pinpoint the issue to the [solenoid/phaser].
Did you test the resistance and operation of the VVT solenoid before recommending replacement?
Good answer: Yes, we tested the solenoid's resistance and also commanded it on and off with the scan tool to confirm it wasn't responding correctly.
Repair Cost Estimate
DIY Repair
Parts only
$50-$400
Shop Repair
Parts + labor
$100-$1200
Save $50-$800 by doing it yourself
Difficulty
intermediate
Time
1-4 hours
Intermediate - While an oil change is beginner-friendly, replacing a VVT solenoid requires some mechanical comfort, and diagnosing deeper issues like a cam phaser requires more advanced tools and knowledge.
Cost of Waiting
Ignoring P0021 can lead to severe engine damage, including bent valves, piston damage, or premature wear on other timing components. Misfires caused by incorrect timing can also send unburned fuel to your catalytic converter, leading to a costly $800-$2,500 replacement. A $50-$150 VVT solenoid fix now prevents a $1,000+ engine or converter repair later.
While You're In There...
The VVT system relies heavily on clean engine oil. If you're diagnosing or replacing VVT components, a fresh oil change is a critical first step and good preventative maintenance.
If the repair requires removing the valve cover to access the cam phaser or other timing components, replacing the valve cover gasket prevents future oil leaks and saves on labor.
Tools You'll Need
- OBD-II Scan Tool
- Socket Set
- Wrenches
- Screwdrivers
- Torque Wrench
- Oil Filter Wrench (if changing oil)
- Oil Drain Pan
- Multimeter (for electrical testing)
P0021 is a common engine code related to your variable valve timing system. Most repairs are straightforward, often involving an oil change or a VVT solenoid replacement, and your engine will run smoothly afterward.
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Your Next Steps
Step 1: Check your engine oil level and condition. If it's low, top it off. If it's dirty or past its service interval, perform an oil and filter change. Clear the code and drive to see if it returns.
Step 2: If the code returns after an oil change, locate the Bank 2 intake VVT solenoid. Inspect its wiring and connector. If they look good, consider replacing the VVT solenoid itself. This is a common and relatively easy DIY fix.
Step 3: If replacing the VVT solenoid doesn't resolve the P0021 code, the issue is likely with the camshaft phaser or deeper engine problems. At this point, professional diagnosis with a scan tool to monitor live data and possibly an oil pressure test is recommended. Parts you'll likely need: VVT solenoid (Bank 2 intake), engine oil, oil filter.