C0640 - Steering Angle Sensor Malfunction in Various Vehicles

Quick Answer

C0640 means: C0640 indicates a malfunction with the steering angle sensor, affecting vehicle handling and safety features.

Fix: Check and replace faulty components Cost: $200 - $400 Time: 90-180 minutes

Can I drive with C0640? It is advisable to address this issue immediately as it impacts steering and stability control.

Common Questions

What does C0640 mean and how does it affect my car?

The C0640 code indicates a problem with the steering angle sensor. This can lead to erratic vehicle handling, potential loss of stability control, and could compromise safety systems like ABS. Addressing this code is crucial for maintaining vehicle control and safety.

What are the most common causes of C0640 and how much does it cost to fix?

Common causes of C0640 include a faulty steering angle sensor (60% likelihood) and damaged wiring. Repair costs typically range from $100 to $400 depending on whether you need a sensor replacement or wiring repairs.

Can I drive my car with C0640 or should I stop immediately?

While you might be able to drive your car, it is not recommended. C0640 affects steering and stability control, which can be dangerous. It's best to have the issue diagnosed and repaired as soon as possible.

How can I diagnose C0640 myself using GeekOBD APP?

You can use the GeekOBD APP to scan for DTCs. Once you find C0640, check the freeze frame data for context. Then, perform visual inspections and component tests following the app's prompts for further guidance.

What vehicles are most commonly affected by C0640?

Vehicles such as the Chevrolet Silverado (2014-2018), Ford F-150 (2015-2019), and Honda Accord (2016-2020) frequently experience C0640 due to common steering angle sensor issues.

How can I prevent C0640 from happening again?

Regular maintenance, including inspections of the steering system and ensuring proper alignment, can help prevent C0640. Additionally, addressing any warning lights promptly will enhance the longevity of your steering components.

What is C0640?

The Diagnostic Trouble Code (DTC) C0640 typically appears when there is an issue with the steering angle sensor in your vehicle. This sensor plays a crucial role in determining the position of the steering wheel, which is vital for various systems such as stability control, traction control, and the anti-lock braking system (ABS). When C0640 is triggered, it usually indicates that the sensor is not functioning properly or that there is an issue with its wiring or connections. This can lead to several real-world implications. For instance, you might experience erratic vehicle handling, the activation of warning lights on your dashboard, or even a complete loss of certain safety features. Common vehicle makes that may encounter this issue include the Chevrolet Silverado (2014-2018), Ford F-150 (2015-2019), and Honda Accord (2016-2020). If left unaddressed, a malfunctioning steering angle sensor can pose serious safety risks, particularly when making sharp turns or during adverse weather conditions. Therefore, understanding the meaning behind DTC C0640 and addressing it promptly is essential for maintaining your vehicle's performance and safety.

System: C - Chassis (ABS, Steering, Suspension)

Symptoms

Common symptoms when C0640 is present:

  • The check engine light illuminates, indicating a fault with the steering system.
  • Erratic steering response when turning, making it difficult to control the vehicle effectively.
  • The stability control warning light may activate, indicating that the system is disabled.
  • Increased wear on tires due to improper alignment and steering response.
  • Difficulty in calibrating the steering angle sensor after repairs, leading to recurring issues.

Possible Causes

Most common causes of C0640 (ordered by frequency):

  1. The most common cause is a faulty steering angle sensor, which accounts for about 60% of cases. This can happen due to wear and tear or manufacturing defects.
  2. A second common cause is damaged wiring or poor connections in the sensor circuit. This could lead to intermittent signals being sent to the vehicle's computer.
  3. A third cause can be related to a misalignment of the steering mechanism, which can prevent the sensor from accurately detecting the steering wheel's position. Regular maintenance can help prevent this.
  4. Less common but serious causes include software issues in the vehicle's control module, requiring a reprogramming to resolve the C0640 code.
  5. A rare cause may involve a malfunction within the steering column itself, which could necessitate replacement of the entire steering assembly.

C0640 Repair Costs

Cost Breakdown by Repair Type

Steering Angle Sensor Replacement

Replacing the faulty steering angle sensor with a new OEM part to restore functionality.

  • Total: $200 - $400
  • Success rate: 85%
Wiring Repair

Repairing damaged wiring or poor connections associated with the steering angle sensor.

  • Total: $100 - $200
  • Success rate: 70%
Money-Saving Tips for C0640
  • 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 C0640 Diagnosis Process

Follow these systematic steps to accurately diagnose C0640. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context and gather more insights (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context and gather more insights (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the steering angle sensor and associated wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the steering angle sensor and associated wiring (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - After repairs, verify the proper operation of the steering angle sensor and clear any codes (10-15 minutes)

Step 4: System function test - After repairs, verify the proper operation of the steering angle sensor and clear any codes (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the steering operates correctly (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the steering operates correctly (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

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 Ford F-150

Vehicle: 2017 Ford F-150, 45,000 miles

Problem: Customer reported the stability control light was on and the vehicle felt unstable during sharp turns.

Diagnosis: An OBD2 scan revealed code C0640. A visual inspection found the steering angle sensor was faulty.

Solution: The steering angle sensor was replaced with an OEM part, and the system was recalibrated.

Cost: $350 (sensor $250, labor $100)

Result: The vehicle handled normally post-repair, and the stability control light turned off.

Case Study 2: Wiring Repair on 2016 Honda Accord

Vehicle: 2016 Honda Accord, 60,000 miles

Problem: Customer experienced erratic steering response and the check engine light was on.

Diagnosis: Code C0640 was present. A wiring inspection revealed corrosion at the connector.

Solution: The damaged wiring was repaired, and connections were cleaned.

Cost: $150 (labor $100, parts $50)

Result: Steering response returned to normal, and no further issues were reported.

Diagnose C0640

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: C0640
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes