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Home/Cars/Tesla/Model S/Plaid/Refresh (2021-present)/my Tesla Model S Original (2012-2020) has a check engine light on for C1175

my Tesla Model S Original (2012-2020) has a check engine light on for C1175

Tesla Model S Plaid/Refresh (2021-present)

Error Codes
Severity: mediumDifficulty: mediumError Code: C11751-2 hours
3 min read
503 words

Problem Statement

Learn how to diagnose and fix C1175 electrical issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
C1175
Affected Component
Electrical
Estimated Time
1-2 hours

Safety Warnings

  • ⚠Disconnect the 12V battery before working on electrical components.
  • ⚠Allow the vehicle to sit for a few minutes after disconnecting the battery to ensure all systems are powered down.

Symptoms

  • •Check engine light illuminated
  • •Reduced power output
  • •Regenerative braking may be disabled
  • •Battery performance degradation
  • •Possible alerts on the dashboard related to battery or power management

Diagnostic Steps

  1. 1Scan the vehicle's onboard diagnostics using an OBD-II scanner to confirm the C1175 code and check for any additional codes that may provide context.
  2. 2Inspect the battery connections for any signs of corrosion, loose cables, or damaged connectors.
  3. 3Check the health of the 12V battery and the main battery pack using Tesla's diagnostics.
  4. 4Review battery management system (BMS) parameters for abnormal readings.
  5. 5Update the vehicle's software to ensure the latest firmware is installed as it may resolve software-related issues.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Ensure the vehicle is parked on a level surface and the parking brake is engaged.
  • Disconnect the 12V battery for safety before proceeding with electrical work.

2. Inspect Battery Connections

  • Remove the access panel to the battery terminals.
  • Visually inspect all battery connections for corrosion.
  • Use a wire brush to clean any corrosion on terminals and connectors.
  • Tighten any loose connections securely to manufacturer specifications.

3. Check and Replace 12V Battery (if necessary)

  • Use a multimeter to measure the voltage of the 12V battery; it should be above 12.4 volts.
  • If the battery voltage is low (below 12.4 volts), proceed to replace the battery.
  • Remove the old battery by disconnecting the negative terminal first, followed by the positive terminal.
  • Install the new 12V battery by connecting the positive terminal first, followed by the negative terminal.

4. Reset the Error Code

  • Reconnect the 12V battery and turn on the vehicle.
  • Use the OBD-II scanner to clear the C1175 error code from the system.
  • Monitor the vehicle for any reoccurrence of the error code.

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
  • •Wire brush
  • •Socket set

Parts Required

  • •Replacement 12V battery (if needed)
  • •Battery terminal cleaner (if applicable)

Additional Information

Error Code
C1175
Affected Component
Electrical
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
4 items
Parts Required
2 items

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