What Does P0021 Mean?
The PCM has determined that the Bank 2 intake camshaft timing is more advanced than the commanded position. This is the Bank 2 equivalent of P0011. The VVT system on the opposite bank is failing to retard the intake cam when requested, causing over-advanced timing conditions at idle or low RPM.
Common Causes
30%
Incorrect oil viscosity or low engine oil level on Bank 2 VVT supply
30%
Stuck or malfunctioning Bank 2 intake VVT oil control valve
20%
Sludge accumulation in Bank 2 intake VVT phaser oil passages
15%
Worn Bank 2 intake VVT phaser with internal seal leakage
5%
Timing chain stretch on Bank 2 shifting cam position
Diagnostic Steps
1
Verify engine oil level and condition; ensure correct viscosity per manufacturer spec
2
Monitor Bank 2 intake cam actual position vs. desired — deviation greater than 5 degrees over-advanced at idle confirms the code
3
Actuate the Bank 2 intake VVT solenoid with bidirectional control; verify it clicks and measure coil resistance (6.9-7.9 ohms)
4
Remove and inspect the Bank 2 intake VVT oil control valve for sludge or stuck spool valve; clean and retest
5
Compare Bank 2 cam position response to Bank 1 — if Bank 1 responds normally, the issue is isolated to Bank 2 components
Estimated Repair Cost
$50 - $800
Parts + labor, varies by vehicle and location
The PCM has determined that the Bank 2 intake camshaft timing is more advanced than the commanded position. This is the Bank 2 equivalent of P0011. The VVT system on the opposite bank is failing to retard the intake cam when requested, causing over-advanced timing conditions at idle or low RPM.
The most common cause of P0021 ("A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)) is: Incorrect oil viscosity or low engine oil level on Bank 2 VVT supply
Typical repair costs for P0021 range from $50 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Rough idle and reduced fuel economy are likely. The vehicle can be driven but should be repaired to prevent catalytic converter damage from improper combustion timing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0021 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing (VVT) System
Difficulty
Type
Generic (SAE)
Recommended Tools
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