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Home/Cars/Tesla/Model S/Plaid/Refresh (2021-present)/why does my Tesla Model S Original (2012-2020) have a rough idle when cold

why does my Tesla Model S Original (2012-2020) have a rough idle when cold

Tesla Model S Plaid/Refresh (2021-present)

Severity: mediumDifficulty: medium2-4 hours
3 min read
483 words

Problem Statement

Learn how to diagnose and fix rough idle issues in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Component
Electrical
Repair Time
2-4 hours

Safety Warnings

  • ⚠Always disconnect the high-voltage battery before performing repairs on the vehicle's electrical systems.
  • ⚠Allow the vehicle to cool before inspecting any components.

Symptoms

  • •Rough or inconsistent performance during initial acceleration
  • •Unusual vibrations felt in the cabin
  • •Reduced power output until the vehicle warms up
  • •Occasional warning messages on the dashboard
  • •Increased energy consumption during the cold start phase

Diagnostic Steps

  1. 1Connect an OBD-II scanner to retrieve any stored error codes related to the drivetrain or battery management system.
  2. 2Check the vehicle's software version and ensure it is up to date.
  3. 3Inspect battery temperature readings to verify if the battery is within optimal operating conditions.
  4. 4Evaluate the performance of the electric motors using Tesla's diagnostic tools for potential issues.
  5. 5Review the HVAC system operation to ensure no interference with normal operation.
  6. 6Monitor tire pressure, as under-inflated tires can contribute to performance issues.

Solution

Solution

1. Preparation

  • Ensure the vehicle is parked on a level surface.
  • Disconnect the high-voltage battery pack to ensure safety during any repairs.

2. Update Software

  • Navigate to the vehicle settings menu.
  • Check for available software updates under the "Software" tab.
  • Follow prompts to download and install any updates.

3. Battery Management System Check

  • Reconnect the high-voltage battery pack.
  • Use diagnostic software to assess battery performance.
  • If battery temperature readings are inconsistent, consider replacing the battery temperature sensors.

4. Motor Performance Inspection

  • Use the diagnostic tools to run motor performance tests.
  • If any faults are detected, troubleshoot the individual electric motor for issues such as poor connections or motor wear.
  • Replace motor components as necessary.

5. HVAC System Functionality

  • Inspect the HVAC system for any faults or irregularities.
  • Ensure the cabin air filter is clean and not obstructing airflow.
  • If issues are found, replace faulty components such as the blower motor or control module.

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
  • Diagnostic software for Tesla vehicles
  • Basic hand tools (socket set, screwdrivers)

Parts Required

  • Battery temperature sensors (if needed)
  • Cabin air filter (if needed)
  • Blower motor (if needed)

Additional Information

Component

Electrical

Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

3 items

Parts

3 items

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