why does my Tesla Model S Original (2012-2020) run rough when starting cold?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

471 words

Problem Statement

Diagnose and fix rough cold starts in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, tools, and safety tips.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the high-voltage battery before working on electrical systems.
•Allow the vehicle to cool down before inspecting or working on the cooling system.

Symptoms

•Rough acceleration during initial startup
•Increased noise from the electric motors
•Fluctuating power delivery
•Longer than usual time to reach normal operating conditions
•Potential warning messages on the dashboard

Diagnostic Steps

1
Check the battery state of charge (SoC) using the vehicle's interface.
2
Inspect the battery temperature using the diagnostics menu.
3
Review the logs for any fault codes related to the drive unit or battery.
4
Monitor the performance of the electric motors using Tesla service mode.
5
Verify the condition of the battery cooling system, including coolant levels and pump operation.
6
Inspect the high-voltage connections and wiring for any signs of wear or damage.

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
•Multimeter
•Torque wrench
•Coolant funnel

Parts Required

•Tesla-approved coolant

Related Faults

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Diagnostic Steps

1
Check the battery state of charge (SoC) using the vehicle's interface.
2
Inspect the battery temperature using the diagnostics menu.
3
Review the logs for any fault codes related to the drive unit or battery.
4
Monitor the performance of the electric motors using Tesla service mode.
5
Verify the condition of the battery cooling system, including coolant levels and pump operation.
6
Inspect the high-voltage connections and wiring for any signs of wear or damage.

Solution

1. Preparation

Gather necessary tools and equipment.
Ensure the vehicle is parked on a level surface and is in "Park" mode.
Disconnect the high-voltage battery for safety.

2. Battery Temperature Check

Reconnect the high-voltage battery.
Access the vehicle’s diagnostic menu and check the battery temperature.
If the temperature is below optimal range, allow the vehicle to precondition the battery using the mobile app or scheduled charging.

3. Inspect Cooling System

Check the coolant reservoir for proper levels and top off with Tesla-approved coolant if low.
Ensure the coolant pump is operational; listen for sounds indicating it is running.
Inspect hoses and connections for leaks or blockages.

4. High-Voltage Connection Inspection

Visually inspect high-voltage connections for signs of corrosion, wear, or damage.
Tighten any loose connections ensuring they are secure.
Use a multimeter to test for continuity in the wiring harness.

5. Reset and Recalibrate

Perform a soft reset of the vehicle by holding down the steering wheel buttons until the screen reboots.
Allow the vehicle to recalibrate the battery management system by driving it under varying conditions.