C0789 - Understanding the Steering Angle Sensor Malfunction in Ford and GM Vehicles

Quick Answer

C0789 means: C0789 indicates a malfunction in the steering angle sensor, affecting stability control.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with C0789? Immediate attention recommended to avoid loss of vehicle control.

Common Questions

What does C0789 mean and how does it affect my car?

The C0789 code indicates a problem with your vehicle's steering angle sensor. This sensor is vital as it helps your car's computer understand how far and in what direction you're steering. If this sensor malfunctions, it can interfere with your car's stability control systems, potentially leading to unsafe driving conditions. Ignoring this issue could result in difficulty steering or even loss of control during a turn.

What are the most common causes of C0789 and how much does it cost to fix?

The most common causes of the C0789 code include a faulty steering angle sensor, which can account for about 45% of cases, along with wiring issues and calibration problems. Repairs can range from $100 to $300 depending on whether you need a sensor replaced or wiring repaired.

Can I drive my car with C0789 or should I stop immediately?

It is not advisable to drive your vehicle if the C0789 code is present. The steering angle sensor plays a crucial role in maintaining vehicle stability, and driving with this issue could lead to loss of control, especially during turns.

How can I diagnose C0789 myself using GeekOBD APP?

Using the GeekOBD APP, you can start by scanning your vehicle for trouble codes. Once you find the C0789 code, look for freeze frame data that provides context on when the error occurred. Following that, you can visually inspect wiring and connections, and if you have the correct tools, test the steering angle sensor's voltage output to ensure it's functioning properly.

What vehicles are most commonly affected by C0789?

C0789 is commonly found in vehicles like the 2013-2018 Ford Fusion, 2014-2018 Chevrolet Silverado, and 2015-2019 Dodge Charger. These models have experienced issues with steering angle sensors, particularly after certain mileage intervals.

How can I prevent C0789 from happening again?

Regular maintenance of your vehicle's steering components is essential. Ensure that all connections are clean and secure, and consider having the steering system calibrated after any repairs or replacements. Keeping an eye on warning lights and addressing them promptly can also help prevent the recurrence of the C0789 code.

What is C0789?

The DTC C0789 code indicates a malfunction related to the steering angle sensor, which is crucial for vehicle stability and safety systems. This sensor helps determine the angle of the steering wheel and communicates this information to the vehicle's computer systems. When the C0789 code triggers, it often signifies that the sensor’s signal is either out of range or not being received at all. This issue can affect systems like electronic stability control (ESC) and anti-lock braking systems (ABS), leading to compromised vehicle handling. For instance, in 2013-2018 Ford Fusion and 2014-2018 Chevrolet Silverado models, a faulty steering angle sensor could lead to unexpected vehicle behavior during turns. Drivers may experience increased difficulty in steering or see warning lights on the dashboard, which could lead to a lack of confidence in the vehicle's performance. Ignoring this code can lead to more severe safety issues, including loss of control during driving, making it imperative to address the concern promptly. Regular checks and maintenance of steering components can help prevent the occurrence of this code, ensuring a safer driving experience.

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

Symptoms

Common symptoms when C0789 is present:

  • Check engine light stays on constantly, indicating a persistent issue with the steering angle sensor.
  • Steering feels loose or unresponsive, leading to difficulty in maintaining vehicle direction.
  • Traction control or stability control lights may illuminate, signaling potential safety concerns.
  • Inconsistent steering behavior, such as the vehicle veering during turns, causing driver discomfort.
  • Increased wear on tires due to improper alignment, leading to additional costs over time.

Possible Causes

Most common causes of C0789 (ordered by frequency):

  1. Faulty steering angle sensor (45%) - A common issue where the sensor fails to provide accurate readings, leading to the code being triggered.
  2. Wiring issues (30%) - Damaged or corroded wiring and connectors can interrupt the signal sent from the sensor, resulting in the C0789 code.
  3. Calibration issues (15%) - If the steering angle sensor is not properly calibrated after installation or repairs, it can trigger this code.
  4. Software malfunctions (5%) - Rarely, a software glitch in the vehicle’s computer can misinterpret sensor data, falsely indicating a problem.
  5. Physical damage (5%) - Accidents or impacts that physically damage the steering angle sensor can also lead to this code.

C0789 Repair Costs

Cost Breakdown by Repair Type

Steering Angle Sensor Replacement

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

  • Total: $150 - $300
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring that connects the steering angle sensor.

  • Total: $100 - $200
  • Success rate: 85%
Money-Saving Tips for C0789
  • 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 C0789 Diagnosis Process

Follow these systematic steps to accurately diagnose C0789. 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 (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (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 - Verify proper operation after repairs and clear codes with the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes with the GeekOBD APP (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 that repairs were successful (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm that repairs were successful (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 in a 2016 Ford Fusion

Vehicle: 2016 Ford Fusion, 75,000 miles

Problem: Customer reported a persistent check engine light and difficulty steering.

Diagnosis: Diagnostics revealed a C0789 code indicating a malfunction in the steering angle sensor. Visual inspection showed signs of wear on the sensor.

Solution: Replaced the faulty steering angle sensor with an OEM part and recalibrated the system.

Cost: $250 (parts: $150, labor: $100)

Result: After the repair, the check engine light was cleared, and the steering response was restored.

Case Study 2: Wiring Repair on a 2015 Chevy Silverado

Vehicle: 2015 Chevrolet Silverado, 60,000 miles

Problem: Owner noticed the traction control light was on, alongside a C0789 code.

Diagnosis: Found damaged wiring leading to the steering angle sensor, which was interrupting the signal.

Solution: Repaired the wiring and checked the sensor functionality.

Cost: $180 (parts: $30, labor: $150)

Result: Post-repair, the vehicle's stability control systems functioned correctly without any warning lights.

Diagnose C0789

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: C0789
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes