Quick Answer
C0140 means: C0140 indicates a malfunction in the steering angle sensor circuit.
Can I drive with C0140? Immediate attention recommended to ensure vehicle safety and performance.
Common Questions
What does C0140 mean and how does it affect my car?
The C0140 code signifies a problem with your steering angle sensor. This can affect your vehicle's stability, as the sensor is crucial for systems that help maintain traction and prevent skidding. If ignored, it could lead to more serious handling issues and potentially compromise safety.
What are the most common causes of C0140 and how much does it cost to fix?
The most common cause of C0140 is a faulty steering angle sensor, which typically costs between $200 and $400 to replace. Other causes include wiring issues, which can cost up to $250 to repair. Regular inspections can help you avoid these problems.
Can I drive my car with C0140 or should I stop immediately?
While you might be able to drive with C0140, it is not advisable. The malfunction can impair your steering and stability control, making your vehicle potentially unsafe to drive. Immediate attention is recommended.
How can I diagnose C0140 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for codes, view live data from the steering angle sensor, and analyze freeze frame data to understand the context of the error. Look for unusual readings or patterns that could indicate a malfunction.
What vehicles are most commonly affected by C0140?
The C0140 code is particularly common in the 2015-2018 Honda Civic, but can also affect other vehicles with similar steering systems. Be sure to check for any related recalls or technical service bulletins (TSBs).
How can I prevent C0140 from happening again?
To avoid future occurrences of C0140, ensure regular maintenance, including checking wiring connections and the steering system. Calibration after any steering work is crucial, and using high-quality parts during repairs can also help prevent issues.
What is C0140?
The C0140 diagnostic trouble code (DTC) is primarily associated with a malfunction in the steering angle sensor, particularly in vehicles like the 2015-2018 Honda Civic. This code indicates that the vehicle's onboard diagnostic system has detected an issue with the steering angle sensor circuit, which plays a crucial role in various systems, including stability control and advanced driver assistance systems (ADAS). When this sensor fails or sends inaccurate readings, it can lead to several issues, such as the activation of warning lights on the dashboard, impaired handling, and decreased safety features. In real-world situations, car owners may notice that their vehicle's steering feels off or that electronic stability control (ESC) is less effective. Ignoring this code can result in further complications, including higher repair costs down the line. Therefore, understanding the implications of C0140 and addressing it promptly is essential for maintaining your vehicle's performance and safety.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0140 is present:
- Check engine light stays on constantly, indicating a persistent problem with the steering angle sensor.
- Unresponsive steering or a feeling of looseness in the steering wheel during turns, which can compromise handling.
- Electronic stability control (ESC) warning light may illuminate, suggesting issues with vehicle stability systems.
- Difficulty calibrating the steering angle sensor after alignment or repairs, which may result in further code triggers.
- Increased fuel consumption due to a malfunctioning sensor affecting driving dynamics.
Possible Causes
Most common causes of C0140 (ordered by frequency):
- A faulty steering angle sensor, which is the most common cause, with a likelihood of 60%. This can happen due to wear and tear or internal failure.
- Damaged wiring or poor connections in the sensor circuit can account for about 25% of cases, leading to intermittent code appearances.
- Calibration issues after a steering alignment could be responsible for around 10% of occurrences; ensuring proper recalibration post-service can prevent this.
- Less common causes include a malfunctioning electronic control unit (ECU), which affects sensor readings but occurs in about 4% of cases.
- Rarely, external interference from other electronic components in the vehicle can lead to false readings, accounting for about 1% of cases.
C0140 Repair Costs
Cost Breakdown by Repair Type
Steering Angle Sensor Replacement
Replacing the faulty steering angle sensor with a new OEM part.
- Total: $200 - $400
- Success rate: 90%
Wiring Repair
Repairing damaged wiring or connectors in the sensor circuit.
- Total: $100 - $250
- Success rate: 85%
Money-Saving Tips for C0140
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional C0140 Diagnosis Process
Follow these systematic steps to accurately diagnose C0140. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 2: Step 2
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 3: Step 3
Step 3: Component testing - Use a multimeter to check the resistance and voltage of the steering angle sensor (20-30 minutes)
Step 4: Step 4
Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)
Step 5: Step 5
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no further codes appear (15-20 minutes)
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: Steering Angle Sensor Replacement on 2017 Honda Civic
Vehicle: 2017 Honda Civic, 45,000 miles
Problem: Customer reported a persistent check engine light and loose steering.
Diagnosis: Using the GeekOBD APP, we confirmed the presence of the C0140 code and performed a visual inspection revealing a faulty steering angle sensor.
Solution: Replaced the faulty steering angle sensor and recalibrated using the GeekOBD APP.
Cost: $320 (parts: $200, labor: $120)
Result: Post-repair, the check engine light was cleared, and the steering was restored to normal functionality.
Case Study 2: Wiring Repair on 2016 Honda Civic
Vehicle: 2016 Honda Civic, 50,000 miles
Problem: Intermittent steering issues and ESC warning light activation.
Diagnosis: The GeekOBD APP revealed the C0140 code. A thorough inspection found damaged wiring near the steering column.
Solution: Repaired the damaged wiring and ensured all connections were secure.
Cost: $150 (parts: $30, labor: $120)
Result: After the repair, the steering issues were resolved, and no warning lights reappeared.