what does the B1140 code mean for my Tesla Outback 5th Generation (2015-2019)

Subaru Outback 5th Generation (2015-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: B1140

3 min read

528 words

Problem Statement

Learn how to diagnose and fix B1140 TPMS fault in Tesla Outback 2015-2019. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

B1140

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Always use jack stands to secure the vehicle when performing maintenance.

Symptoms

•Check tire pressure warning light illuminated on the dashboard
•Inaccurate tire pressure readings displayed
•TPMS system malfunction message on the infotainment screen
•Potential fluctuations in vehicle handling due to incorrect tire pressure
•Possible issues with tire inflation or deflation

Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to confirm B1140 code presence.
2
Inspect all four tire pressure sensors for visible damage or corrosion.
3
Check the tire pressures of all tires to ensure they are within manufacturer specifications.
4
Verify the integrity of the TPMS wiring harness for any signs of damage or disconnection.
5
Test the TPMS sensors individually to determine if they are transmitting data correctly.
6
Clear the fault codes and observe if the B1140 code reappears after a drive cycle.

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
•Socket set
•Torque wrench
•Jack and jack stands
•TPMS tool

Parts Required

•TPMS sensor (if replacement is necessary)
•Valve stem (if damaged)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to confirm B1140 code presence.
2
Inspect all four tire pressure sensors for visible damage or corrosion.
3
Check the tire pressures of all tires to ensure they are within manufacturer specifications.
4
Verify the integrity of the TPMS wiring harness for any signs of damage or disconnection.
5
Test the TPMS sensors individually to determine if they are transmitting data correctly.
6
Clear the fault codes and observe if the B1140 code reappears after a drive cycle.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the ignition is turned off.
Disconnect the vehicle battery for safety.

2. Inspect and Replace TPMS Sensor

Remove Wheel:
- Loosen lug nuts with a socket wrench.
- Lift the vehicle using a jack and secure it with jack stands.
- Remove the wheel to access the TPMS sensor.
Check Sensor:
- Locate the TPMS sensor mounted on the valve stem.
- Remove the sensor by unscrewing it from the valve stem using a wrench.
- Inspect the sensor for damage or corrosion.
Replace Sensor (if defective):
- Install a new TPMS sensor by threading it onto the valve stem.
- Tighten it to the manufacturer's specified torque (usually around 3-5 Nm).
Reinstall Wheel:
- Place the wheel back on the hub.
- Hand-tighten the lug nuts, then lower the vehicle.
- Torque the lug nuts to the manufacturer’s specifications (typically around 100-120 Nm).

3. Reprogram the TPMS

Reconnect Battery:
- Reconnect the vehicle battery and ensure all connections are secure.
Reprogram Sensors:
- Follow the vehicle manufacturer's procedure to reprogram the TPMS sensors, which typically involves using a TPMS tool or the vehicle's onboard settings.