What Causes Shuddering in the 2019 Chevy Colorado?

If an older Chevy Colorado develops a shudder, vibration, or repeated light shaking while driving, the first question is what is causing the sensation. A shudder can feel like the vehicle is travelling over a rough surface or rumble strips even when the road is smooth.

For the 2019 Chevy Colorado, one possible source is the torque converter clutch (TCC) in the automatic transmission. You may feel a shake or shudder associated with the torque converter clutch under light-throttle, steady-speed driving on applicable Colorado models. 

However, a shudder does not automatically mean the torque converter is the cause. Driving conditions, engine, transmission, speed, and whether the vibration changes with engine or vehicle speed all help determine where the problem originates.

What Does Shuddering Feel Like in a 2019 Chevy Colorado?

“Shuddering” describes a repeated vibration or shaking sensation rather than a single bump or impact.

A driver may notice it:

• During light acceleration
• At a steady road speed
• When the transmission is holding a gear
• When the torque converter clutch is engaging
• As a vibration that feels similar to driving over rough pavement
• As a repeated vibration rather than one isolated movement

The Chevrolet Service Bulletin 18-NA-355 describes a shake or shudder during light-throttle acceleration between 40 and 128 km/h (25 and 80 mph) during steady-speed driving when the transmission is not actively shifting. The bulletin specifically includes the 2017–2019 Chevy Colorado with the LGZ V6 and M5T 8-speed automatic transmission, subject to the applicable vehicle build information. That makes the exact conditions under which the shudder occurs important.

How the Torque Converter Can Cause a Shudder

The automatic transmission uses a torque converter between the engine and transmission. Inside the torque converter is a torque converter clutch. Under appropriate driving conditions, the clutch can lock to reduce slip between the engine and transmission.

When the clutch is operating correctly, engagement should be smooth. If vibration occurs specifically while the torque converter clutch is applying or operating in its controlled slip range, you can feel it through the vehicle.

The Chevrolet diagnostic procedure uses specific testing to determine whether the vibration is actually TCC shudder. The procedure compares the vibration with the torque converter clutch operating in different states. This distinction matters because simply feeling a vibration does not establish that the torque converter is responsible.

Transmission Fluid Can Be Part of the Diagnosis

Transmission fluid is another part of the diagnostic process. A fluid-related corrective procedure is appropriate when testing confirms the vibration is TCC shudder. The bulletin also emphasizes investigating other sources of vibration when testing does not identify TCC shudder. 

The owner’s information also states that checking and changing the automatic transmission fluid involves a special procedure and recommends having a dealer perform this service. For that reason, simply adding or changing fluid without confirming the cause is not a substitute for diagnosis.

Other Things Can Cause a Shudder

A transmission-related shudder is only one possibility. A vibration can also originate elsewhere in the vehicle, including components associated with the tires, wheels, brakes or driveline. Technicians should investigate other vehicle vibration sources when the testing does not confirm torque converter clutch shudder. 

For example, a vibration that occurs only during a particular transmission operating condition may point the diagnosis in a different direction from a vibration that increases directly with road speed. Likewise, a vibration that follows engine speed rather than vehicle speed provides different diagnostic information.

How to Narrow Down the Source of the Shudder

You do not need to diagnose the transmission yourself, but paying attention to when the symptom occurs can provide useful information.

1. Note the vehicle speed

Determine approximately when the shudder occurs.

For example, does it happen:

• Below 40 km/h?
• Between 40 and 80 km/h?
• Above 80 km/h?
• At one specific speed?
• Across a wider range of speeds?

The applicable Chevrolet bulletin identifies 40–128 km/h as the range for the particular light-throttle TCC shudder condition it addresses. That does not mean every vibration within that range is TCC shudder.

2. Pay attention to throttle position

Notice whether the vibration happens when accelerating lightly or when applying more throttle. A shudder during light, steady acceleration is particularly useful because it is one of the operating conditions Chevrolet identifies for TCC shudder diagnosis. 

3. Notice whether the transmission is shifting

Try to determine whether the sensation occurs during an actual gear change or while the transmission appears to be maintaining the same gear. The Chevrolet bulletin specifically describes the relevant condition as occurring during steady-speed driving when the transmission is not actively shifting. 

4. Describe the sensation accurately

There is a difference between:

• A single clunk
• A continuous vibration
• A repeated shudder
• A vibration that increases with speed
• A vibration that appears only during acceleration

Describing the symptom accurately can help a technician determine the appropriate diagnostic procedure.

5. Note whether it disappears when conditions change

If the shudder disappears when you change throttle input, road speed or transmission operating conditions, make a note of that. This does not prove a particular component is responsible, but it gives the technician another useful diagnostic clue.

What Does the Chevrolet Diagnostic Procedure Looks For

The diagnostic process can compare the vehicle’s behaviour with the torque converter clutch operating normally, disabled and locked under controlled conditions. If the vibration disappears when the clutch is disabled and returns under the appropriate clutch operating condition, that supports a TCC shudder diagnosis. The procedure can also use specialized diagnostic equipment to distinguish TCC shudder from other vibration sources.

This matters because vibration that remains when the torque converter clutch is disabled points the diagnosis elsewhere. Technicians diagnose vehicle vibration when TCC shudder is not confirmed. 

Does the 2019 Model Year Automatically Have the TCC Shudder Condition?

No. Not every older Colorado has the condition, and not every shudder is caused by the torque converter clutch. Specific engine and transmission combinations, along with vehicle production information, can affect applicability. For the Colorado, it lists the LGZ V6 with the M5T transmission and a March 1, 2019 date breakpoint. 

Therefore, check the vehicle’s VIN and build information before assuming a particular service bulletin applies.

When Should a Shudder Be Checked?

A shudder deserves attention when it is repeatable, becoming more noticeable, or accompanied by other symptoms.

It is particularly useful to have the vehicle evaluated if:

• The vibration repeatedly occurs under the same conditions.
• It occurs during light-throttle acceleration.
• It happens at steady road speeds.
• It feels as though the vehicle is travelling over rough pavement when the road is smooth.
• The instrument display shows transmission-related messages.
• Changes in shifting behaviour accompany the vibration.

Chevrolet owner information indicates that a SERVICE TRANSMISSION message means there may be a transmission problem and advises servicing the vehicle. 

What to Tell a Technician

Instead of simply reporting that the 2019 Chevy Colorado is “shuddering,” provide as much detail as possible.

A useful description would include:

• Approximate speed
• Engine temperature or whether the vehicle is warmed up
• Whether the throttle is light or heavy
• Whether the transmission is shifting
• Whether the vibration occurs during acceleration or steady cruising
• Whether it disappears when the throttle position changes
• Whether any warning message appears

This information can help determine whether the symptom matches the conditions described in the Chevrolet TCC shudder diagnostic information or whether another source should be investigated.

Keep Your 2019 Chevy Colorado in Top Condition

A shudder in an older Chevy Colorado can have several causes, but the torque converter clutch is a likely possibility for certain configurations, especially when the vibration occurs during light-throttle, steady-speed driving.

Chevrolet service information specifically covers a TCC shudder condition for certain Colorado configurations and provides diagnostic procedures to distinguish it from other vibration sources. 

The key is not to assume that every vibration is a transmission problem. Recording exactly when the shudder occurs—especially its speed, throttle position and relationship to transmission operation—provides the information needed to determine the appropriate next diagnostic step.

Disclaimer: Content contained in this post is for informational purposes only and may include features and options from US or internacional models. Please contact the dealership for more information or to confirm vehicle, feature availability.