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Home/Cars/Tesla/Model 3/Highland (2024-present)/how to fix P0300 misfire code in Tesla Model 3 Original (2017-2023)

how to fix P0300 misfire code in Tesla Model 3 Original (2017-2023)

Tesla Model 3 Highland (2024-present)

Severity: highDifficulty: mediumError Code: P03002-4 hours
3 min read
471 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0300 engine misfire in Tesla Model 3 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0300
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Always disconnect the high-voltage battery before performing any repairs.
  • ⚠Allow the vehicle to cool down before working on electrical components.

Symptoms

  • •Check engine light illuminated
  • •Rough acceleration or performance issues
  • •Decreased fuel efficiency
  • •Engine stalling or hesitating
  • •Unusual engine vibrations

Diagnostic Steps

  1. 1Scan the vehicle with an OBD-II scanner to confirm the P0300 code and check for additional codes.
  2. 2Inspect the high-voltage battery and its connections for any faults.
  3. 3Check the state of charge of the battery to ensure it is within operating range.
  4. 4Perform a visual inspection of the electrical connections to the motor and battery.
  5. 5Monitor the temperature of the battery and motor; overheating can cause misfires.
  6. 6Conduct a test of the electric motor function and performance.

Solution

Solution

1. Preparation

  • Gather tools and parts needed.
  • Ensure the vehicle is parked on a flat surface, and the parking brake is engaged.
  • Disconnect the high-voltage battery before proceeding with repairs.

2. Inspect Battery Connections

  • Remove the cover from the battery compartment.
  • Check all connections for corrosion or loose fittings.
  • Tighten any loose connections and clean corrosion if present.
  • Reconnect the battery and ensure all connections are secure.

3. Check and Replace High-Voltage Fuses

  • Locate the high-voltage fuse box.
  • Inspect fuses for continuity using a multimeter.
  • Replace any blown fuses with ones of the same amperage rating.

4. Update Software

  • Connect the vehicle to a Tesla service station or use the Tesla app to check for any software updates.
  • Follow the prompts to update the vehicle’s software to the latest version.

5. Test Drive the Vehicle

  • After performing repairs, take the vehicle for a test drive to observe any changes in performance.
  • Monitor for any reoccurrence of the check engine light.

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
  • Basic hand tools (socket set, screwdrivers)

Parts Required

  • High-voltage fuses (if applicable)
  • Cleaning supplies for battery terminals

Additional Information

Error CodeP0300
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

4 items

Parts

2 items

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