How to Fix Code DTC P0024 Mercedes-Benz

The Diagnostic Trouble Code (DTC) P0024 in Mercedes-Benz vehicles indicates an issue with the exhaust camshaft timing on Bank 2. Specifically, the camshaft’s position exceeds the Engine Control Module’s (ECM) commanded range. This malfunction is commonly associated with the Variable Valve Timing (VVT) system, engine oil quality, or mechanical failures in timing components.

Affected models include Mercedes C-Class, E-Class, and G-Class, where proper diagnosis and repair are necessary to restore optimal engine performance.

Symptoms of the Mercedes P0024 Code

• Check Engine Light illuminated
• Rough idling or stalling, especially during cold starts
• Reduced power and sluggish acceleration
• Engine knocking noises due to improper valve timing
• Failed emissions test due to incomplete combustion

Causes of P0024 in Mercedes-Benz Vehicles

1. Low or Degraded Engine Oil

The VVT system relies on clean, high-quality oil for proper hydraulic pressure. Low or contaminated oil can cause improper camshaft timing. Mercedes-Benz recommends synthetic oil that meets MB 229.5 or MB 229.52 specifications.

2. Faulty VVT Solenoid or Camshaft Phaser

A malfunctioning VVT solenoid can restrict oil flow, while a damaged phaser may cause the camshaft to remain in an over-advanced position. Checking the solenoid’s resistance (6.9–7.9 Ω at 68°F) and operation is crucial.

3. Timing Chain or Belt Wear

Stretched timing chains or worn tensioners can cause camshaft misalignment. Mercedes engines such as M276 and M278 commonly experience chain wear beyond 80,000 miles.

4. Electrical and LIN Bus Faults

Corroded connectors, damaged wiring, or LIN bus communication issues can disrupt the signals between the ECM and camshaft position sensors. An oscilloscope test of the LIN bus can help diagnose signal integrity.

5. ECM Software Issues

Outdated ECM firmware can misinterpret sensor readings and trigger false DTCs. Flashing the latest software via Xentry or OEM tools may resolve the issue.

Step-by-Step Diagnostic and Repair Procedure

Step 1: Check Engine Oil Condition

• Verify oil level and quality using the dipstick.
• Replace oil and filter if sludge is present.

Step 2: Scan for Additional Error Codes

• Check for related codes such as P0014 (intake camshaft issues) or U1153 (LIN bus faults).

Step 3: Test the VVT Solenoid

• Resistance Check: Measure solenoid resistance. A reading outside 6.9–7.9 Ω indicates failure.
• Actuation Test: Apply 12V to the solenoid. A clicking sound confirms proper operation.

Step 4: Inspect and Clean Oil Control Valve (OCV) and Phaser

• Remove and soak the OCV in cleaner to dissolve sludge.
• Use compressed air (20–30 psi) to test phaser actuation.

Step 5: Examine the Timing Chain

• Remove the timing cover and check for chain slack.
• Verify camshaft alignment at Top Dead Center (TDC).

Step 6: LIN Bus and Electrical Diagnostics

• Voltage Check: Ensure 12V is present at the VVT solenoid with the ignition on.
• Oscilloscope Test: Monitor LIN bus signals for irregularities.

Repair Solutions for P0024

1. Perform an Oil Change and Replace the Filter

• Use Mercedes-approved 5W-40 synthetic oil.
• Reset the oil service indicator.

2. Replace the VVT Solenoid

• Disconnect the solenoid’s electrical connector.
• Remove mounting bolts and install a new OEM solenoid (e.g., Mercedes part A276 070 04 48).

3. Replace the Timing Chain

• Lock the crankshaft at TDC.
• Remove the timing cover, guides, and tensioner.
• Install a new chain and re-time the engine.

4. Update ECM Software

• Use Xentry or Autel MS908 to flash the latest firmware.
• Clear fault codes and perform an adaptation reset.

Preventive Measures

• Follow Mercedes’ recommended oil change interval (every 10,000 miles or 1 year).
• Inspect wiring and connectors regularly for damage or corrosion.
• Enable automatic ECM updates via Mercedes Me Connect.

Is It Safe to Drive with P0024?

Driving with a P0024 code may cause severe engine damage due to improper valve timing. Immediate diagnosis and repair are recommended to avoid costly failures.

If you’re struggling to resolve the P0024 code in your Mercedes-Benz, VCCarTool offers professional diagnostics, coding, and programming support. Contact us via WhatsApp at +1 (901) 414 – 1927 for expert assistance.