why does my Tesla Model 3 Original (2017-2023) have poor acceleration after 70mph

Tesla Model 3 Highland (2024-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

4 min read

623 words

Problem Statement

Learn how to diagnose and fix poor acceleration after 70 mph in Tesla Model 3 (2017-2023). Step-by-step guide with symptoms, diagnostics, and solutions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always ensure the vehicle is in 'Park' mode before performing any inspections or repairs.
•Allow the vehicle to cool down if it has been driven hard prior to working on the cooling system.

Symptoms

•Noticeable decrease in acceleration after 70 mph
•Possible increase in battery temperature
•Reduced power output during highway driving
•Potential warning messages on the dashboard
•Decrease in overall efficiency and range

Diagnostic Steps

1
Check the battery state of charge and health using the Tesla app or onboard diagnostics.
2
Inspect the battery cooling system for any blockages or failures.
3
Verify tire pressure and condition, ensuring they meet manufacturer specifications.
4
Use the onboard diagnostics to check for any error codes related to the powertrain or battery management system.
5
Monitor battery temperature during operation to see if it exceeds normal operating ranges.
6
Test drive the vehicle at various speeds to assess performance and identify any inconsistencies.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Tire pressure gauge
•Basic hand tools (screwdriver set, socket set)

Parts Required

•Replacement tires (if necessary)
•Cooling system components (if any leaks or failures are found)

Related Faults

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Diagnostic Steps

1
Check the battery state of charge and health using the Tesla app or onboard diagnostics.
2
Inspect the battery cooling system for any blockages or failures.
3
Verify tire pressure and condition, ensuring they meet manufacturer specifications.
4
Use the onboard diagnostics to check for any error codes related to the powertrain or battery management system.
5
Monitor battery temperature during operation to see if it exceeds normal operating ranges.
6
Test drive the vehicle at various speeds to assess performance and identify any inconsistencies.

Solution

1. Preparation

Gather tools: OBD-II scanner (if applicable), tire pressure gauge.
Ensure the vehicle is parked on a level surface and is in "Park" mode.
Disconnect the charger if the vehicle is plugged in.

2. Battery Cooling System Inspection

Access the Cooling System:
- Remove the front trunk cover by unscrewing the fasteners (typically 10mm bolts).
- Carefully lift the cover to expose the cooling lines and fans.
Inspect for Blockages:
- Check the cooling lines for any obstructions or leaks.
- Ensure that the cooling fans are operating correctly by turning on the vehicle and observing the fans.
Clean Components:
- If any debris is found, clean the fans and cooling ducts with compressed air.
- Reassemble the front trunk cover after inspection and cleaning.

3. Tire Pressure and Condition

Check and Adjust Tire Pressure:
- Use a tire pressure gauge to measure all four tires.
- Inflate or deflate tires to reach the recommended pressure listed in the owner's manual.
Inspect Tire Condition:
- Examine the tread depth and sidewalls for any signs of damage or uneven wear.
- Replace any tires that do not meet safety standards.

4. Battery Health Assessment

Check Battery State of Charge:
- Use the Tesla app to view battery health and state of charge.
- If the battery capacity is significantly diminished, consider contacting Tesla for a battery health evaluation.
Address Battery Temperature Issues:
- If the battery temperature is higher than normal, ensure that the cooling system is functioning properly.
- If necessary, allow the vehicle to cool down before further testing.