What Does P0024 Mean?
P0024 indicates that the 'B' camshaft (typically the exhaust camshaft) on Bank 2 is over-advanced or the VVT system is not performing correctly. The ECM has detected that the exhaust cam position is further advanced than the commanded target. This can cause increased valve overlap, rough idle, potential misfires, and poor low-speed driveability. On some engines, an over-advanced exhaust cam on Bank 2 may also cause a slight decrease in power and an increase in NOx emissions.
Common Causes
30%
Bank 2 exhaust VVT solenoid stuck in the advance position due to sludge, debris, or internal valve failure
25%
Worn exhaust cam phaser on Bank 2 with internal seal failure causing the phaser to drift to the advance position
20%
Incorrect engine oil viscosity or severely degraded oil affecting VVT hydraulic control precision
15%
Timing chain stretch on Bank 2 causing the exhaust cam to appear over-advanced relative to the crankshaft
10%
Low oil pressure reducing the ability of the VVT system to hold the commanded cam position against return spring force
Diagnostic Steps
1
Monitor Bank 2 exhaust camshaft actual position vs. desired position in live data at idle, 1,500 RPM, and 2,500 RPM — note if the actual position is consistently 3+ degrees more advanced than the target.
2
Remove and inspect the Bank 2 exhaust VVT solenoid — check the screen filter for sludge and test the solenoid plunger for smooth, spring-loaded return. A solenoid that does not snap back when power is removed is stuck.
3
Check engine oil level and verify the correct viscosity is being used. Perform an oil change if the oil is more than 5,000 miles past its service interval.
4
Command the VVT solenoid to 0% duty cycle (full retard) using a bidirectional scan tool and verify the exhaust cam moves to the fully retarded position. If it remains advanced, the phaser is mechanically stuck.
5
If the cam phaser appears stuck, check for timing chain stretch by measuring the cam-to-crank offset with the VVT disabled — deviation greater than 3-5 degrees indicates chain stretch or a jumped tooth.
Estimated Repair Cost
$150 - $2,000
Parts + labor, varies by vehicle and location
P0024 indicates that the 'B' camshaft (typically the exhaust camshaft) on Bank 2 is over-advanced or the VVT system is not performing correctly. The ECM has detected that the exhaust cam position is further advanced than the commanded target. This can cause increased valve overlap, rough idle, poten...
The most common cause of P0024 ("B" Camshaft Position - Timing Over-Advanced or System Performance (Bank 2) - See Trouble Code P0021) is: Bank 2 exhaust VVT solenoid stuck in the advance position due to sludge, debris, or internal valve failure
Typical repair costs for P0024 range from $150 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle can be driven with caution, but the over-advanced exhaust cam may cause rough idle, misfires, and reduced low-speed power. If accompanied by a noisy timing chain, stop driving to prevent potential engine damage on interference engines.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0024 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing (VVT)
Difficulty
Type
Generic (SAE)
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