P0024 — Camshaft Position (CMP) Exhaust/Right/Rear Bank 2 – Timing Over-Advanced/System Performance #

The description of DTC P0024 may vary depending on the vehicle manufacturer (OEM). Always consult your manufacturer-specific documentation for precise wording and diagnostic procedures.

Known label variations:

• P0024: “Exhaust Camshaft Position Timing – Over-Advanced (Bank 2)” (General Motors, Ford, BMW)
• P0024: “B Camshaft Position – Timing Over-Advanced or System Performance (Bank 2)” (Toyota, Lexus)
• P0024: “Exhaust Camshaft Timing Over-Advanced, Bank 2” (Hyundai, Kia, Nissan)
• P0024: “Camshaft Position B – Timing Over-Advanced or System Performance (Bank 2)” (Honda, Acura)

Code P0024 Summary #

P0024 is a generic OBD-II trouble code indicating that the engine control module (ECM) has detected that the exhaust camshaft timing for Bank 2 is more advanced than the desired value. In simpler terms, the exhaust camshaft (the shaft responsible for opening and closing the exhaust valves) on the right or rear bank of your engine is not in the position the ECM expects, often due to a problem with the variable valve timing (VVT) system. This discrepancy can affect engine performance, emissions, and overall driveability. While the code is triggered by the ECM, its root causes can range from simple oil issues to more complex mechanical or electrical failures. Addressing P0024 promptly can help prevent further engine damage or costly repairs.

Frequent Symptoms for Code P0024 #

When P0024 is present, you might notice a range of symptoms. Sometimes, the signs are subtle, while in other cases they can be dramatic, affecting your confidence behind the wheel. Here’s what you might experience:

• Check Engine Light: Illuminated or flashing MIL (Malfunction Indicator Lamp)
• Rough Idle: Engine feels uneven or shaky at idle
• Reduced Power: Noticeable lack of acceleration or sluggish performance
• Poor Fuel Economy: Increased fuel consumption compared to normal
• Engine Stalling: Occasional engine stalls, especially when stopping
• Hard Starting: Engine may take longer to start or may not start at all
• Rattling Noise: Unusual noises from the engine, especially near the timing cover

Probable Causes for Code P0024 #

The most frequent causes of P0024 often relate to problems with the variable valve timing (VVT) system or the oil that feeds it. However, other mechanical or sensor issues can also be responsible. Here’s a breakdown from most to least common:

1. Dirty or Low Engine Oil: Oil quality and level directly affect VVT operation.
2. Faulty VVT (Variable Valve Timing) Solenoid/Actuator: The solenoid controls oil flow to the camshaft phaser.
3. Camshaft Phaser Malfunction: The phaser adjusts cam timing; if stuck or damaged, timing will be off.
4. Wiring or Connector Issues: Open, short, or corroded connections at the solenoid or camshaft position sensor.
5. Faulty Camshaft Position Sensor (CMP): Sensor provides position data to the ECM; inaccurate input can cause false readings.
6. Timing Chain/Belt Problems: Excessive slack, wear, or improper installation can shift cam timing.
7. ECM/PCM software or internal fault: Rare, but possible if all other causes are ruled out.

Step-by-Step Diagnosis for P0024 #

Diagnosing P0024 requires patience and a methodical approach. Start simple and escalate to more complex checks only if needed. Here’s a proven workflow:

• 1. Verify the code and record freeze frame data using a professional scan tool. Note engine conditions when P0024 set.
• 2. Inspect engine oil level and condition. Top up or replace if dirty, low, or overdue for service.
• 3. Perform a visual check of the VVT solenoid (bank 2 exhaust side), phaser, and related wiring/connectors for damage, corrosion, or loose pins.
• 4. Test the VVT solenoid. Remove and bench-test if possible; check for proper resistance and operation.
• 5. Check camshaft position sensor (CMP) signals with an oscilloscope or scan tool for erratic or missing signals.
• 6. Inspect timing chain/belt alignment. If suspicion remains, remove covers to verify timing marks.
• 7. If all else checks out, consider ECM/PCM reprogramming or replacement as a last resort.

Possible Repairs for Code P0024 #

Repairs should directly address the root cause found during diagnosis. Here are the most common corrective actions, ranked by likelihood:

• Engine Oil Change: Replace oil and filter with manufacturer-recommended grade and viscosity.
• Replace VVT Solenoid (Bank 2 Exhaust): Swap out faulty or clogged solenoid.
• Repair or Replace Camshaft Phaser: If seized or malfunctioning, replace the phaser assembly.
• Repair Wiring/Connections: Clean, repair, or replace damaged connectors, wires, or pins at the VVT solenoid or CMP sensor.
• Replace Camshaft Position Sensor: Install a new sensor if the old one is faulty or sending erratic signals.
• Timing Chain or Belt Service: Replace worn, stretched, or misaligned components and re-time the engine.
• ECM/PCM Reprogram or Replace: Only if all mechanical and electrical causes are eliminated.

Is It Safe to Drive with Code P0024? #

Driving with code P0024 is not recommended. While your vehicle may still run, continued driving can lead to increased engine wear, poor performance, and potential damage to internal components like the catalytic converter. In some cases, the engine may enter “limp” mode, restricting power to prevent further damage. Address the issue as soon as possible to avoid costly repairs and maintain safe operation.

Vehicles Most Commonly Affected by Code P0024 #

P0024 is most prevalent in vehicles equipped with variable valve timing systems, especially those with V6 or V8 engines and dual overhead camshafts (DOHC). It’s a frequent flyer in these makes and models:

• BMW 3-Series, 5-Series, X3, X5 (N52, N62 engines)
• Ford F-150, Mustang, Explorer (5.4L, 4.6L V8)
• Nissan Maxima, Pathfinder, Frontier (VQ35DE engine)
• Hyundai Santa Fe, Sonata (3.3L, 3.8L V6)
• Chevrolet Silverado, Tahoe (5.3L, 6.0L Vortec V8)
• Toyota Tacoma, Tundra, 4Runner (4.0L V6, 5.7L V8)
• Lexus RX350, GS350 (2GR-FE, 3GR-FE engines)

Common Mistakes & Best Practices for P0024 #

There are a few traps that even seasoned technicians can fall into when troubleshooting P0024. Here’s how to avoid them:

• Ignoring oil condition: Always check oil quality and level first; dirty or incorrect oil is a top cause.
• Replacing sensors prematurely: Don’t replace the camshaft position sensor or VVT solenoid until you’ve verified they are faulty.
• Skipping wiring checks: Electrical issues are common—don’t overlook connectors and harnesses.
• Not verifying timing marks: If timing components are worn or have been recently serviced, always check alignment.
• Clearing codes without repair: Resetting the ECM doesn’t fix the underlying issue; expect the code to return if not properly addressed.

Express FAQ for Code P0024 #

Still have questions? Here are quick answers to common concerns:

Q: Can P0024 be triggered by a recent oil change?
A: Yes, if the wrong oil viscosity or low-quality oil is used. Always use the OEM-recommended oil type and viscosity.

Q: Will clearing the code make my car run better?
A: No, clearing the code without fixing the cause will not solve the problem. The code and symptoms will likely return until the root issue is resolved.