P0021

Q: What does OBD2 code P0021 mean?

P0021 means: Camshaft Position Timing Over-Advanced Bank 2. Bank 2 intake camshaft timing is over-advanced. The cam is advancing beyond the commanded position.

Camshaft Position Timing Over-Advanced Bank 2

Bank 2 intake camshaft timing is over-advanced. The cam is advancing beyond the commanded position.

SeverityCritical

CategoryEngine

Est. Repair Cost$150–$900

Code TypePowertrain

DIY RepairProfessional

⚡ Common Causes

›Dirty engine oil
›VVT solenoid stuck open bank 2
›Cam phaser failure bank 2
›Stretched timing chain

⚠️ Symptoms

›Hard starting
›Rough idle
›Check engine light
›Cold start rattle

✅ How to Fix — Step by Step

Step 1:Oil change immediately
Step 2:Clean or replace VVT solenoid bank 2
Step 3:Inspect timing chain
Step 4:Replace cam phaser if faulty

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Digital Multimeter
✔Fuel Pressure Gauge
✔Compression Tester
✔Spark Tester

Using the correct diagnostic tools helps identify the root cause of P0021 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: P0011 and P0021 both present at once means the entire VVT system needs service — start with an oil change.

Repair Cost Estimate

Full Repair Estimate

$150–$900

DIY Possible?

PRO

Severity

Critical

Frequently Asked Questions

What does OBD2 code P0021 mean?+

P0021 stands for Camshaft Position Timing Over-Advanced Bank 2. Bank 2 intake camshaft timing is over-advanced. The cam is advancing beyond the commanded position.

What causes code P0021?+

Dirty engine oil; VVT solenoid stuck open bank 2; Cam phaser failure bank 2; Stretched timing chain

How do I fix code P0021?+

Oil change immediately; Clean or replace VVT solenoid bank 2; Inspect timing chain; Replace cam phaser if faulty

How much does it cost to fix P0021?+

Estimated repair cost for P0021 is $150–$900.

Is P0021 DIY-friendly?+

P0021 typically requires professional equipment and a qualified mechanic.