P0024
B Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)
Encountering the engine check light code P0024 signifies an explicit mechanical or electrical operational breakdown categorized as "B Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)". Professional scanner tools usually flag this subsystem loop early on.
Driver's Summary
The diagnostic trouble code P0024 indicates an active fault in the b camshaft position - timing over-advanced or system performance (bank 2) circuit or component. In practice, this fault causes hard starting, stalling, engine noise/rattling. This condition is classified as high severity. Prompt diagnosis is essential to prevent cascading damage to related components.
Symptoms
Hard starting, stalling, engine noise/rattling
Common Causes
- Continuous oil flow to VVT chamber (stuck solenoid)
- Failed camshaft phaser on Bank 2
- Incorrect timing chain alignment
- Extremely dirty engine oil
How to Fix
- 1 Replace VVT control solenoid
- 2 Change engine oil and filter
- 3 Replace camshaft phaser sprocket
- 4 Realign or replace timing chain
Technical Explanation
The ECM detects code P0024 by continuously monitoring the relevant sensor circuit against calibrated threshold values stored in its non-volatile memory. The module measures the voltage return on the 5V reference circuit, comparing it to the expected signal envelope at current engine load and RPM. A deviation greater than the calibrated threshold — typically ±10% outside the normal operating window — flags the fault. The MIL illuminates after the fault is confirmed on two consecutive drive cycles, and the freeze frame data captured at first detection is stored in the PCM's memory for diagnostic reference.
Is It Safe to Drive?
This fault carries real mechanical risk. The root causes — including continuous oil flow to vvt chamber (stuck solenoid) — can trigger a chain reaction of component failures if the vehicle continues to be driven. Have it towed or drive directly to a shop without delay.
Mechanic's Pro Tip
For P0024, test the solenoid's coil resistance with a multimeter before ordering parts — most solenoids should read between 14 and 40 ohms; an open (infinite resistance) or short (near zero) confirms it's failed electrically. Also verify the PCM is commanding the solenoid by backprobing the connector with a test light during the relevant operating condition — if there's no command signal, the fault is in the PCM or wiring, not the solenoid itself.
Oil change: $50; VVT Solenoid: $200; Phaser/Timing job: $1,200 - $1,800