The 2016 Chevy Silverado, a workhorse of a truck, is known for its reliability and capability. However, like any complex piece of machinery, it's not immune to problems. One area that has caused concern for some Silverado owners is the transmission, specifically the 8-speed automatic (8L90) and, to a lesser extent, the 6-speed automatic (6L80). Understanding the potential issues, their symptoms, and possible solutions can save you time, money, and a whole lot of frustration.

So, What's the Deal with the 2016 Silverado Transmission?

The 2016 Silverado offered both a 6-speed and an 8-speed automatic transmission, depending on the engine and trim level. While both transmissions are generally robust, the 8L90 has faced more scrutiny due to reported issues. The 8L90 was designed to improve fuel economy and performance through its increased number of gears, but some owners have reported experiencing rough shifting, shuddering, and hesitation. Let's dig deeper into the most common problems.

The Dreaded "Chevy Shake": Understanding the Shudder

One of the most widely reported issues with the 2016 Silverado's 8L90 transmission is a shudder, often described as a vibration or shaking sensation, especially at lower speeds (around 20-80 mph) and under light acceleration. This shudder is often referred to as the "Chevy Shake."

Why does this happen?

The shudder is primarily attributed to torque converter clutch (TCC) issues. The torque converter acts as a fluid coupling between the engine and the transmission, allowing the engine to keep running even when the wheels are stopped. The TCC locks up at certain speeds to improve efficiency by eliminating slippage.

  • Contaminated Transmission Fluid: Over time, the transmission fluid can become contaminated with moisture. This moisture can disrupt the friction properties of the fluid, leading to slippage and shuddering in the TCC. This is the most common culprit.
  • Torque Converter Wear: With extended use, the internal components of the torque converter, including the TCC, can wear down. This wear can prevent the TCC from engaging and disengaging smoothly, causing vibrations.
  • Valve Body Issues: The valve body controls the flow of transmission fluid to different parts of the transmission. If valves within the valve body become stuck or worn, they can disrupt the proper functioning of the TCC.
  • Software Glitches: In some cases, the transmission control module (TCM) software may not be properly calibrated, leading to incorrect TCC engagement and disengagement.

What can you do about it?

  • Transmission Fluid Flush and Replacement: This is the first and often most effective solution. Using the correct type of transmission fluid (typically Dexron HP) is crucial. A professional transmission flush will remove contaminated fluid and replace it with fresh fluid. Multiple flushes may be necessary.
  • Torque Converter Replacement: If a fluid flush doesn't resolve the issue, the torque converter itself may need to be replaced. This is a more involved and expensive repair.
  • Valve Body Repair or Replacement: If the valve body is identified as the source of the problem, it may be possible to repair it by cleaning or replacing individual valves. In some cases, a complete valve body replacement may be necessary.
  • TCM Reprogramming: A software update or reprogramming of the TCM may be required to correct TCC engagement and disengagement issues. This is typically done by a dealership or a qualified mechanic with access to the necessary diagnostic tools.

Rough Shifting: When Gears Don't Mesh Smoothly

Another common complaint is rough or harsh shifting, particularly between certain gears. This can manifest as a noticeable jerk or clunk when the transmission shifts.

What's causing the bumpy ride?

  • Low or Contaminated Transmission Fluid: Again, this is a primary suspect. Insufficient fluid or degraded fluid can prevent the transmission from shifting smoothly.
  • Valve Body Issues: Malfunctioning valves within the valve body can cause delayed or abrupt shifts.
  • Solenoid Problems: Solenoids are electromagnetic valves that control the flow of transmission fluid to different parts of the transmission. If a solenoid fails, it can disrupt the shifting process.
  • Internal Transmission Damage: In more severe cases, rough shifting can be a sign of internal damage to the transmission, such as worn gears or damaged clutch packs.
  • TCM Malfunction: The TCM controls the entire shifting process. A faulty TCM can lead to erratic or rough shifting.

How to smooth things out:

  • Check Transmission Fluid Level and Condition: Regularly check the transmission fluid level and condition. If the fluid is low, add the correct type of fluid. If the fluid is dark, smells burnt, or contains debris, it should be flushed and replaced.
  • Valve Body Repair or Replacement: As with shuddering, addressing valve body issues can resolve rough shifting.
  • Solenoid Replacement: If a faulty solenoid is identified, it can be replaced.
  • Transmission Rebuild or Replacement: If internal damage is the cause, the transmission may need to be rebuilt or replaced. This is a major repair and should be performed by a qualified technician.
  • TCM Diagnosis and Repair: Have the TCM diagnosed to rule out any software or hardware issues.

Hesitation: The Dreaded Delay

Some Silverado owners have reported experiencing hesitation, particularly when accelerating from a stop or when trying to pass another vehicle. This delay in response can be frustrating and even dangerous.

Why the lag?

  • Torque Converter Issues: Problems with the torque converter, such as a worn TCC, can cause hesitation.
  • Valve Body Problems: Again, the valve body plays a critical role in transmission performance. Malfunctioning valves can lead to delays in shifting and acceleration.
  • Throttle Position Sensor (TPS) Problems: The TPS tells the engine control unit (ECU) how much throttle the driver is requesting. A faulty TPS can send incorrect signals, leading to hesitation.
  • Engine Issues: While less common, engine problems such as a clogged fuel filter or faulty spark plugs can also cause hesitation.
  • Transmission Control Module (TCM) issues: As the brain of the transmission, the TCM could be sending incorrect signals.

Possible solutions:

  • Torque Converter Inspection and Repair: Have the torque converter inspected for wear and tear.
  • Valve Body Repair or Replacement: Address any valve body issues.
  • Throttle Position Sensor (TPS) Replacement: If the TPS is faulty, it should be replaced.
  • Engine Tune-Up: Perform a basic engine tune-up, including replacing the fuel filter and spark plugs.
  • TCM Diagnosis and Repair: Have the TCM diagnosed to rule out any software or hardware issues.

The 6-Speed: Not Immune, But Less Problematic

While the 8L90 has received the most attention, the 6L80 transmission in some 2016 Silverados can also experience issues, though typically to a lesser extent. Common problems with the 6L80 include:

  • Rough Shifting: Similar to the 8L90, rough shifting can occur due to low or contaminated fluid, valve body issues, or solenoid problems.
  • Slipping: The transmission may slip out of gear or fail to engage properly.
  • Overheating: Excessive heat can damage the transmission.

Addressing 6L80 Issues:

The solutions for 6L80 problems are similar to those for the 8L90:

  • Regular Fluid Changes: Maintain the transmission fluid by changing it at the recommended intervals.
  • Valve Body Service: Address any valve body issues promptly.
  • Cooling System Maintenance: Ensure the transmission cooling system is functioning properly to prevent overheating.

Preventative Maintenance: The Key to a Healthy Transmission

The best way to avoid transmission problems is to perform regular preventative maintenance. This includes:

  • Regular Transmission Fluid Changes: Follow the manufacturer's recommended service intervals for transmission fluid changes. Using the correct type of fluid is crucial.
  • Checking Fluid Levels: Regularly check the transmission fluid level and condition.
  • Avoiding Harsh Driving: Avoid aggressive acceleration and hard braking, which can put extra stress on the transmission.
  • Proper Towing Practices: If you tow with your Silverado, follow the manufacturer's recommendations for towing capacity and use the correct towing mode.
  • Addressing Issues Promptly: Don't ignore any signs of transmission problems. Address them promptly to prevent further damage.

Frequently Asked Questions

  • What type of transmission fluid does my 2016 Silverado use? The 8-speed generally uses Dexron HP, while the 6-speed uses Dexron VI. Always consult your owner's manual for the specific recommendation.
  • How often should I change my transmission fluid? Refer to your owner's manual, but generally, every 45,000-60,000 miles is a good guideline for normal driving. Severe driving conditions may require more frequent changes.
  • Can I change my transmission fluid myself? While possible, it's recommended to have a professional perform a transmission flush to ensure all the old fluid is removed and the correct fluid is used.
  • Is the "Chevy Shake" a common problem? Yes, it's a known issue, particularly with the 8L90 transmission.
  • How much does it cost to fix transmission problems? Costs vary greatly depending on the issue, from a few hundred dollars for a fluid flush to several thousand for a rebuild or replacement.

The Bottom Line

While the 2016 Chevy Silverado can experience transmission problems, particularly with the 8L90 transmission, understanding the potential issues and performing regular maintenance can help prevent or mitigate these problems. If you experience any symptoms of transmission problems, it's important to have your truck inspected by a qualified technician as soon as possible. Proactive care will ultimately save you time and money in the long run.