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P0021 is the Bank 2 mirror of P0011. On V6 and V8 engines, Bank 2 is typically the passenger side (Ford) or driver side (GM/Toyota). Start with an oil change and Bank 2 VVT solenoid replacement before investigating deeper causes. See top-rated scanners on Amazon ↗
🗺️ Where Is the Problem?
Blueprint view - P0021 fault localized to the Bank 2 VVT oil control solenoid (passenger/driver side depending on make)
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0021 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
55%
#1 - Most Likely
Bank 2 VVT Solenoid Stuck Open/Dirty
The Bank 2 intake cam VVT solenoid is stuck open or clogged with sludge, continuously advancing the camshaft beyond commanded position. Oil sludge blocks the solenoid screen or prevents the plunger from returning. Replace the solenoid and change the oil together.
🔩 Part
$20–$90
👨🔧 Labor
$50–$200
⚡ DIY Difficulty
Medium
20%
#2 - Check First
Low Engine Oil
Insufficient oil level reduces hydraulic pressure to the Bank 2 VVT actuator, causing erratic cam timing. On V-engines, Bank 2 oil passages may be longer and more susceptible to pressure drops. Check oil level first and top off before diagnosing further.
🔩 Part
$10–$50
👨🔧 Labor
$0
⚡ DIY Difficulty
Easy
15%
#3 - Less Common
Sludged Oil Passages Bank 2
Oil sludge in the dedicated Bank 2 oil feed passages restricts flow to the cam actuator, causing it to respond sluggishly or not at all. An engine oil flush followed by a fresh oil change is the first step when sludge is suspected.
🔩 Part
$30–$80
👨🔧 Labor
$50–$150
⚡ DIY Difficulty
Easy
10%
#4 -
Actuator (Phaser) Failure Bank 2
The Bank 2 cam phaser has worn or seized internally. This is confirmed after oil service and solenoid replacement produce no improvement. Requires removal of the timing cover to access and replace the phaser on most V-engines.
🔩 Part
$80–$280
👨🔧 Labor
$300–$900
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Check Oil Level and Change Oil - Verify oil level on the dipstick. Top off if low. Perform a full oil change with OEM-specified viscosity. Clear the P0021 code and drive 50 miles to see if it returns before replacing any parts.
- Replace Bank 2 VVT Solenoid - Locate the Bank 2 intake cam VVT oil control solenoid (opposite bank from Bank 1). Remove, inspect the screen filter for sludge, and replace. Bank 2 may require more disassembly to access on some V-engines.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need