2020 Toyota Tacoma Transmission Issues: Symptoms and Solutions

How to Fix Transmission Issues

Experiencing transmission problems with your 2020 Toyota Tacoma can be frustrating, especially if it's a new vehicle. Owners have reported various issues, from complete transmission swaps to concerns about clutch feel. As one owner shared, "The dealer is swapping the transmission. OP is pissed that his brand new truck is already getting serious work done and wants the dealer to give him a new truck" (source). This guide will help you understand the potential causes, diagnostics, and fixes related to transmission issues in your truck.

Symptoms

Owners have reported a range of symptoms that may indicate a transmission issue in your truck. One common symptom is jerking during gear changes, which can make driving uncomfortable and potentially unsafe. This can manifest as sudden, unexpected movements when the transmission shifts between gears.

Another reported symptom is a noticeable leak. Transmission fluid leaks can lead to low fluid levels, which can cause slipping, overheating, and eventual transmission failure. Leaks are often accompanied by a distinct smell, signaling that transmission fluid is burning or leaking onto hot engine components. Pay attention to any unusual smells, especially after driving.

Some owners have reported more general symptoms, such as feeling something is "off" or noticing unusual noises coming from the transmission area. These subtle symptoms shouldn’t be ignored, as they could indicate an early stage of a more serious problem. Regularly checking for these subtle indicators can help you catch potential issues before they escalate.

Back pain can be associated with issues related to operating a manual transmission that isn't working properly, which might require more physical exertion than usual. While not directly related to the transmission's mechanical function, this discomfort is something to be aware of.

Most Likely Cause

Based on owner reports, a primary cause of transmission issues in your truck can be related to the fuel system. While seemingly unrelated, issues within the fuel system can sometimes indirectly impact transmission performance, particularly in automatic transmissions that rely on electronic control units influenced by various engine parameters. If the engine isn't running optimally due to fuel delivery problems, it can affect the signals sent to the transmission, leading to erratic shifting or other performance issues.

How to Diagnose

Diagnosing transmission issues requires a systematic approach. Start by checking the transmission fluid level. Low fluid can cause a variety of problems.

1. Check Transmission Fluid Level: Locate the transmission fluid dipstick (consult your owner's manual for its location). With the engine running and the transmission in park (on level ground), pull out the dipstick, wipe it clean, reinsert it fully, and then pull it out again. Check the fluid level against the "full" or "hot" mark. If the level is low, add the recommended transmission fluid type (specified in your owner's manual).
2. Inspect Transmission Fluid Condition: Examine the fluid on the dipstick for its color and smell. Healthy transmission fluid is typically reddish and has a slightly sweet smell. Dark, burnt-smelling fluid indicates overheating or contamination, suggesting internal damage.
3. Visual Inspection for Leaks: Look for any signs of transmission fluid leaks around the transmission housing, cooler lines, and seals. Leaks can appear as wet spots or drips on the ground beneath your truck.
4. Check for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to check for any stored DTCs related to the transmission or fuel system. Common codes may indicate issues with sensors, solenoids, or the transmission control module (TCM).
5. Test Drive: Perform a test drive to observe how the transmission behaves under different driving conditions. Pay attention to the smoothness of shifts, any unusual noises (whining, clunking), and any signs of slipping or hesitation. Note when the issues arise - at certain speeds, under load, etc.

Tools Required:

• OBD-II Scanner
• Jack and jack stands (for under-vehicle inspection)
• Wrench set
• Transmission fluid funnel
• Rags or shop towels

Step-by-Step Fix

Addressing the Fuel System (If Relevant):

If the diagnostic steps point towards a fuel system issue indirectly affecting the transmission, consider these steps:

1. Check the Fuel Filter: A clogged fuel filter can restrict fuel flow, causing the engine to run lean and potentially affecting transmission performance. Replace the fuel filter according to your maintenance schedule.
2. Inspect Fuel Injectors: Dirty or malfunctioning fuel injectors can disrupt the fuel-air mixture, leading to engine performance issues. Consider using a fuel injector cleaner additive or having the injectors professionally cleaned.
3. Check Fuel Pressure: Use a fuel pressure gauge to verify that the fuel pump is delivering the correct amount of fuel to the engine. Low fuel pressure can indicate a failing fuel pump or a clogged fuel line.

Addressing Transmission Speed Sensor:

1. Locate the Sensor: Refer to your service manual to locate the transmission speed sensor. Typically, there are one or two located on the transmission housing.
2. Disconnect the Sensor: Disconnect the electrical connector from the sensor.
3. Test the Sensor: Use a multimeter to check the sensor's resistance. Compare the reading to the specifications in your service manual. An out-of-spec reading indicates a faulty sensor.
4. Replace the Sensor: If the sensor is faulty, remove it using the appropriate wrench or socket. Install the new sensor and torque it to the specified value. Reconnect the electrical connector.

Addressing Accumulator:

1. Identify the Accumulator: Locate the accumulator on your transmission. Consult a repair manual if needed.
2. Inspect for Leaks: Check the accumulator for any signs of leakage.
3. Replace the Accumulator: If faulty, carefully remove the old accumulator and install the new one, ensuring proper seating and torque.

As one owner shared: "The gears are long, the clutch is vague because of the accumulator, and it's not what I'd call precise. I still prefer it to the automatic that was offered in the 3rd gen though." (source). Replacing the accumulator requires careful handling and precision.

Important Note: For complex transmission problems, such as internal damage or complete failure, it is generally recommended to consult with a qualified mechanic. Transmission repairs can be complex and require specialized tools and knowledge.

Parts and Tools Needed

• Transmission fluid (check your owner's manual for the correct type)
• OBD-II scanner
• Jack and jack stands
• Wrench set
• Multimeter
• Fuel filter
• Fuel injector cleaner
• Fuel pressure gauge
• Transmission speed sensor (Part number varies, check with your dealer)
• Accumulator (Part number varies, check with your dealer)

Real Owner Costs

DIY transmission-related repairs on your truck can save you money on labor costs, but the actual savings depend on the complexity of the repair and your mechanical skills. Here's a cost breakdown based on typical owner experiences:

• Transmission Speed Sensor Replacement (DIY):
  • Part cost: $50 - $150
  • Tools (if needed): $20 - $50 (multimeter, wrench)
  • Total DIY cost: $70 - $200
• Transmission Speed Sensor Replacement (Shop):
  • Part cost: $50 - $150
  • Labor cost: $100 - $300
  • Total shop cost: $150 - $450
• Fuel Filter Replacement (DIY):
  • Part cost: $20 - $50
  • Tools (if needed): $10 - $20 (fuel line disconnect tool)
  • Total DIY cost: $30 - $70
• Fuel Filter Replacement (Shop):
  • Part cost: $20 - $50
  • Labor cost: $50 - $150
  • Total shop cost: $70 - $200
• Complete Transmission Swap (Shop):
  • This is a major repair and the cost will vary greatly depending on parts selected and who does the work.
  • Quote from online forum: "I'm getting hosed for $6,400 to replace my transmission and transfer case"
  • This owner had the job quoted at a non-Toyota mechanic shop.

Several owners have had success doing small fixes themselves, like changing the fuel filter or replacing a sensor, but as ZovioTV stated, "Vehicles are way more likely to have issues very early on in their life, and once over 30,000 miles or so they’re far less likely to have issues again until later in their service life around 200,000 miles." (source.

Example 1: One owner reported spending $80 on a new transmission speed sensor and $25 on a multimeter to diagnose and replace the sensor themselves, saving approximately $150 in labor costs.

Example 2: Another owner paid $120 for a shop to replace their fuel filter, as they lacked the necessary tools and expertise.

Prevention

Preventing transmission issues involves regular maintenance and careful driving habits. Here are some key steps:

• Follow the Recommended Maintenance Schedule: Adhere to the transmission fluid change intervals specified in your owner's manual. Regular fluid changes help maintain optimal lubrication and prevent overheating.
• Check Transmission Fluid Regularly: Periodically check the transmission fluid level and condition. Address any leaks promptly.
• Avoid Harsh Driving Habits: Avoid aggressive acceleration, hard braking, and frequent towing beyond the vehicle's capacity. These habits can put excessive strain on the transmission.
• Proper Warm-Up: Allow the engine and transmission to warm up properly before driving, especially in cold weather.
• Use the Correct Transmission Fluid: Always use the transmission fluid type recommended by Toyota. Using the wrong fluid can cause damage.
• Regular Inspections: Have a trusted mechanic inspect the transmission during routine maintenance visits. Early detection of potential problems can prevent costly repairs down the road.

What Owners Say

Real experiences from TOYOTA owners:

Owner Experiences

"The dealer is swapping the transmission. OP is pissed that his brand new truck is already getting serious work done and wants the dealer to give him a new truck." — Sekiro50 (source)

"I don't think you understood his post. The dealer is swapping the transmission." — Sekiro50 (source)

"Toyota has put that in their manual transmission trucks since the 80s. Basically, say you’re out on a trail and close to a ledge or a big rock that you don’t want to get any closer to and you stall out for some reason." — Whitetrashstepdad (source)

Lessons Learned

⚠️ "Make sure to go to a good toyota dealer. You’ve got plenty of warranty left so drive it and see what happens after the fix and if you still have concerns get rid of it or get the extended warranty" — Ruser8050 (source)

⚠️ "You’ve got plenty of warranty left so drive it and see what happens after the fix and if you still have concerns get rid of it or get the extended warranty" — Ruser8050 (source)

Real Repair Costs

"You can get a used drop in transmission for less than $2k online. I would do that and install it or have someone install it." — OperatorM4 (source)

FAQ

Q: How long does it take to fix a transmission speed sensor?

A: Replacing a transmission speed sensor is a relatively straightforward repair that typically takes 1-2 hours for a DIYer with basic mechanical skills. A professional mechanic can usually complete the job in about an hour.

Q: Can I drive with a suspected transmission problem?

A: It's generally not recommended to drive your truck with a suspected transmission problem, as it can lead to further damage and potentially unsafe driving conditions. If you notice symptoms such as slipping, jerking, or unusual noises, it's best to have the vehicle inspected by a mechanic as soon as possible.

Q: Is this a common issue on the 2020 Toyota Tacoma?

A: While not necessarily widespread, transmission issues have been reported by some 2020 Toyota Tacoma owners. It's important to note that vehicles are more likely to have issues early in their life, but regular maintenance and prompt attention to any symptoms can help prevent major problems.

Q: DIY vs mechanic - what's recommended?

A: Whether to tackle transmission repairs yourself or take your truck to a mechanic depends on the complexity of the issue and your mechanical skills. Simple tasks like checking fluid levels or replacing a sensor can often be done by DIYers. However, for more complex repairs, such as internal transmission work or complete replacements, it's best to seek professional assistance to ensure the job is done correctly and to avoid further damage. As Ruser8050 suggests: "Make sure to go to a good toyota dealer. You’ve got plenty of warranty left so drive it and see what happens after the fix and if you still have concerns get rid of it or get the extended warranty" (source.