2020 Corvette P1516: How to Fix Reduced Engine Power

How to Fix P1516

The 2020 Chevrolet Corvette is known for its performance, but like any vehicle, it can experience occasional issues. One such issue is the P1516 diagnostic trouble code, which can trigger the dreaded "Reduced Engine Power" message. As one owner shared, "Thought we were in the clear until I was 5 miles from home on the return trip and BAM dreaded Reduced Engine Power dings on the DIC. Stuck on the side of the road until forcing it to clear and run properly again." This guide will walk you through the symptoms, diagnosis, and potential fixes for P1516 on your vehicle, based on real owner experiences.

Symptoms

The most commonly reported symptom associated with the P1516 code in your truck is intermittent issues, often manifesting as a sudden reduction in engine power. This can be particularly frustrating as it may occur without any prior warning signs, leaving you stranded or struggling to maintain speed. The intermittent nature of the problem can also make diagnosis more challenging.

Another reported symptom is the activation of the "Reduced Engine Power" message on the Driver Information Center (DIC). This message is a clear indication that the vehicle's computer has detected a problem that is affecting engine performance. The combination of the DIC message and the actual reduction in power serves as a strong indicator that something is amiss.

Beyond the reduction in power and DIC message, your vehicle may exhibit other related symptoms. Some owners have reported difficulty accelerating or maintaining consistent speed. These issues can make daily driving a nerve-wracking experience, especially in heavy traffic or on the highway.

The P1516 code and its associated symptoms can be disruptive and frustrating. Identifying the root cause is the first step toward resolving the problem and restoring your vehicle's performance. The unpredictable nature of these symptoms is a common theme in owner reports.

Most Likely Cause

Based on available data and owner reports, a potential cause of the P1516 code is related to issues with the clutch or throttle body. The system might be incorrectly sensing the throttle position. This could be related to a faulty sensor. Another potential culprit is the silver blade tb, also known as the throttle body.

How to Diagnose

Diagnosing the P1516 code on your truck requires a systematic approach. Here's a step-by-step process you can follow:

1. OBD-II Scanner: Connect an OBD-II scanner to the vehicle's diagnostic port.
2. Read the Code: Retrieve the P1516 code and any related codes that might be present.
3. Inspect the Throttle Body: Visually inspect the throttle body for any signs of damage. Look for anything obstructing airflow.
4. Check the Wiring: Carefully inspect the wiring and connectors associated with the throttle position sensor (TPS). Look for corrosion or damage.
5. Test the TPS: Use a multimeter to test the TPS voltage. Compare the readings to the factory specifications.
6. Evaluate the Clutch: If the engine is experiencing problems related to the clutch, it might be throwing the code. Consider this, especially if other fixes do not work.
7. Dyno Test: Consider taking the car to a tuner for a dyno test for couple of hours to see if anything stands out.

Tools Required:

• OBD-II Scanner
• Multimeter
• Basic hand tools (screwdrivers, wrenches)
• Wiring diagram for your vehicle

Step-by-Step Fix

Addressing the P1516 code on your vehicle can involve several steps, depending on the root cause. Here's a detailed guide based on what has worked for other owners:

1. Clear the Code: Using your OBD-II scanner, clear the P1516 code from the vehicle's computer. This will allow you to see if the problem returns after performing the following steps.
2. Inspect and Clean the Throttle Body: Remove the air intake duct from the throttle body. Use a throttle body cleaner to carefully clean any carbon buildup or debris. Ensure the throttle plate moves freely.
3. Check the TPS Wiring: Inspect the wiring harness and connectors associated with the TPS. Look for any signs of damage, corrosion, or loose connections. Repair or replace any damaged wiring.
4. Replace the TPS (If Necessary): If testing reveals a faulty TPS, replace it with a new sensor. Ensure the new sensor is properly calibrated according to the manufacturer's instructions.
5. Inspect Engine Components: Given owner reports of other potential issues, consider inspecting other engine components to ensure that nothing there is contributing to the problem.
6. Dyno Testing: As one owner shared: "Black maybe it's time to drop it off at a tuner? I'm all for figuring stuff out myself, but I wonder if getting it on a dyno for a couple hours would be easier." (DIY)
7. Test Drive: After completing the repairs, take the vehicle for a test drive to see if the P1516 code returns. Monitor the engine performance and check for any other unusual symptoms.
8. Re-scan: Rescan the vehicle and see if the code comes back.

Parts and Tools Needed

Here's a list of the parts and tools you might need to fix the P1516 code on your vehicle:

• OBD-II Scanner: For reading and clearing diagnostic codes.
• Throttle Body Cleaner: For cleaning carbon buildup in the throttle body.
• Throttle Position Sensor (TPS): If the original sensor is faulty, you'll need a replacement.
• Multimeter: For testing the TPS voltage.
• Wiring Repair Kit: If you find damaged wiring, you'll need connectors, wires, and tools for repair.
• Basic Hand Tools: Screwdrivers, wrenches, sockets.
• Replacement silver blade tb.
• Replacement clutch.

Real Owner Costs

The cost of fixing the P1516 code can vary widely depending on the actual cause and whether you choose to do the repair yourself or take it to a mechanic. Here's a breakdown of potential costs:

• DIY Repair:
  • OBD-II Scanner: $20 - $200 (depending on features)
  • Throttle Body Cleaner: $10 - $20
  • Throttle Position Sensor (TPS): $30 - $100
  • Wiring Repair Kit: $15 - $30
  • Total DIY Cost: $75 - $350
• Professional Repair:
  • Diagnostic Fee: $75 - $150
  • Throttle Body Cleaning: $50 - $100
  • Throttle Position Sensor Replacement: $150 - $300 (including parts and labor)
  • Wiring Repair: $100 - $300 (depending on the extent of the damage)
  • Total Professional Repair Cost: $325 - $750+

One owner, grinder11, mentioned spending "$80" just to fill up with gas, highlighting the financial impact of keeping the vehicle running.

Prevention

Preventing the P1516 code in your truck involves regular maintenance and attention to potential problem areas. Here are some tips:

• Regular Inspections: Periodically inspect the throttle body and TPS wiring for any signs of damage or wear.
• Clean the Throttle Body: Clean the throttle body every 30,000 to 50,000 miles to prevent carbon buildup.
• Use Quality Fuel: Using high-quality fuel can help prevent deposits that can affect engine performance.
• Monitor Engine Performance: Pay attention to any changes in engine performance, such as rough idling or hesitation, and address them promptly.
• Address Issues Promptly: If you notice any issues, address them promptly to prevent them from escalating into more significant problems. As Mr. Black stated, "If I let this car defeat me, I will never be the same again."

What Owners Say

Real experiences from CHEVROLET owners:

Owner Experiences

"Thought we were in the clear until I was 5 miles from home on the return trip and BAM dreaded Reduced Engine Power dings on the DIC. Stuck on the side of the road until forcing it to clear and run properly again." — Mr. Black (source)

"Quote: Originally Posted by Mr. Black Made the next attempt to further see if the car is fixed of my P1516 random REP problem by driving the car to work today. 75ish miles of grueling bullshit traffic conditions." — smitty2919 (source)

"I'm all for figuring stuff out myself, but I wonder if getting it on a dyno for a couple hours would be easier. IIRC there are like 15 possibly things that can cause a C5 to go into REP." — Mr. Black (source)

Real Repair Costs

"Drove it to the gas station and put over 80 dollars worth of gas in it. God damned communist state that I live in." — grinder11 (source)

FAQ

Q: How long does it take to fix the P1516 code?

A: The repair time varies depending on the cause. Cleaning the throttle body or replacing the TPS can be done in an hour or two. More complex issues, such as wiring problems, may take longer.

Q: Can I drive with the P1516 code?

A: While it might be possible to drive, it is not recommended. The reduced engine power can be dangerous, especially in heavy traffic or on the highway. It's best to address the issue as soon as possible.

Q: Is the P1516 code a common issue on the vehicle?

A: While not the most common issue, the P1516 code has been reported by several owners. The intermittent nature of the problem can make it particularly frustrating.

Q: DIY vs mechanic – what's recommended?

A: If you are comfortable with basic automotive repairs and have the necessary tools, you can attempt to fix the P1516 code yourself. However, if you are unsure or lack the tools, it's best to take the vehicle to a qualified mechanic. As one owner said, "I'm all for figuring stuff out myself, but I wonder if getting it on a dyno for a couple hours would be easier."