Why is My 2020 Corvette Stalling? (And How to Fix It)

The Quick Fix

The most common and effective solution for a cam-related problem is to replace the faulty camshaft position sensor. This is a relatively inexpensive and accessible repair that resolves the majority of reported issues, such as stalling and rough running. If the problem persists, a more involved inspection of the camshaft itself or the Variable Valve Timing (VVT) system may be necessary.

Telltale Signs

Owners experiencing cam-related issues report several consistent symptoms. Based on the discussions, these are the key indicators:

• Rough Idle and Stalling: The engine runs unevenly at idle and may frequently stall, especially when coming to a stop.
• Loss of Power and Hesitation: A noticeable lack of power during acceleration, often accompanied by stumbling or hesitation.
• Check Engine Light: While not always present, the check engine light is commonly illuminated. Although no specific OBD codes were cited in the discussions, codes related to camshaft position (e.g., P0340, P0341) or timing are typical.
• Unusual Engine Noise: Some reports mention new ticking or tapping noises from the engine bay, which can point to mechanical wear on the cam lobes or lifters.

Easy Solution

The straightforward first step is to diagnose and replace the camshaft position sensor. This electronic component is critical for engine timing. When it fails, it sends incorrect data to the engine computer, causing the symptoms described. It's a common point of failure, often located on the engine's top end for easier access. Swapping it out is a 15-30 minute job for many vehicles and costs between $50 to $150 for the part.

How to Fix It

Solutions should be attempted in this order, starting with the simplest and most cost-effective.

1. Replace the Camshaft Position Sensor (Most Common Fix)

   • Success Rate: High. This resolved the core issue in the majority of discussions where a specific fix was identified.
   • Process: Locate the sensor (usually on the valve cover or engine block), disconnect its electrical connector, remove one or two bolts, and swap in the new sensor.
   • Cost: Part only, $50 - $150.

2. Inspect and Clean/Replace the VVT Solenoid

   • When to Try: If replacing the sensor doesn't work, the Variable Valve Timing solenoid may be stuck or clogged with debris, preventing proper cam timing adjustment.
   • Process: Remove the solenoid, clean its filter screen with brake cleaner, and reinstall. If cleaning fails, replace the solenoid.
   • Cost: Part only for replacement, $100 - $300.

3. Professional Diagnostics for Mechanical Issues

   • When to Try: If electrical components check out, the problem may be mechanical (e.g., worn cam lobes, stretched timing chain, failed VVT phaser).
   • Process: This requires a professional mechanic to perform a visual inspection (often via borescope), check engine compression, and verify timing marks. This is not a beginner DIY task.
   • Cost: Diagnostic time: 1-2 hours of labor ($100 - $250). Actual repair costs for cam replacement are significantly higher.

DIY vs Shop Costs

• DIY Cost (Sensor or Solenoid Replacement):

  • Parts: $50 - $300 for a sensor or VVT solenoid.
  • Tools: Basic socket set, screwdrivers. Total project can often be completed for under $200.
  • Difficulty: Low to Moderate. Sensor replacement is generally easy. Solenoid work may require more disassembly.

• Shop Cost (Professional Repair):

  • Diagnostics: $100 - $250.
  • Camshaft Position Sensor Replacement: $150 - $300 total (parts and labor).
  • VVT Solenoid Replacement: $250 - $500 total.
  • Mechanical Cam/Timing Repair: This is a major engine service. Costs can range from $1,500 to over $4,000 depending on labor hours and whether one or both camshafts need replacement.

Prevention Tips

While sensor failures can be unpredictable, you can minimize the risk of severe mechanical cam problems:

• Use High-Quality Engine Oil and Change It Regularly: This is the single best practice. Clean oil with the correct viscosity prevents sludge buildup that can clog the VVT solenoid and ensures proper lubrication of the camshaft lobes and bearings. Stick to the manufacturer's recommended oil change intervals.
• Address Oil Leaks Promptly: Low oil level from a leak can lead to premature wear on all engine components, including the camshaft.
• Heed Early Warning Signs: Don't ignore a rough idle or intermittent check engine light. Diagnosing a faulty sensor early can prevent misdiagnosis and more expensive repairs later.

Source Summary: This analysis is based on 21 owner discussions from Reddit and automotive forums.