C0770 - Understanding DTC C0770: Common Issues in 2015-2018 Chevy Silverado and GMC Sierra

Quick Answer

C0770 means: DTC C0770 indicates a malfunction in the steering angle sensor or its circuit.

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

Can I drive with C0770? Immediate attention is recommended to prevent safety issues.

Common Questions

What does C0770 mean and how does it affect my car?

DTC C0770 indicates that there's an issue with the steering angle sensor or its circuit, which can lead to impaired vehicle handling and safety features like traction control and stability control not functioning correctly. It's essential to address this issue promptly to ensure safe driving conditions.

What are the most common causes of C0770 and how much does it cost to fix?

The most common cause of C0770 is a faulty steering angle sensor, accounting for about 60% of cases. Repair costs typically range from $150 to $300 for sensor replacement, with additional costs for wiring repairs or recalibration if needed.

Can I drive my car with C0770 or should I stop immediately?

Driving with C0770 is not recommended as it may lead to erratic steering and loss of control. If you notice symptoms like a loose steering wheel or unexpected vehicle behavior, it's best to stop and have your vehicle inspected immediately.

How can I diagnose C0770 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform an OBD2 scan to retrieve the C0770 code and any related codes. The app will also provide freeze frame data to help you understand the vehicle's condition at the time of the error, making it easier to identify the issue.

What vehicles are most commonly affected by C0770?

DTC C0770 is frequently reported in models such as the 2015-2018 Chevrolet Silverado, GMC Sierra, and other GM vehicles with similar electronic steering systems. It's advisable to check for any recalls or technical service bulletins related to your specific model.

How can I prevent C0770 from happening again?

To prevent C0770 from recurring, ensure regular maintenance checks of your vehicle's steering system, and address any electrical issues promptly. Keeping connections clean and free from corrosion can also help maintain the integrity of the steering angle sensor circuit.

What is C0770?

DTC C0770 is a diagnostic trouble code that generally indicates a malfunction in the vehicle's steering angle sensor or its circuit. This code is often seen in popular models such as the 2015-2018 Chevrolet Silverado and GMC Sierra. The steering angle sensor provides critical data to the vehicle's electronic control unit (ECU), assisting in functions like traction control and stability control. When the sensor fails or if there is an issue with the wiring or connectors, it can lead to a loss of steering control, which is not only inconvenient but can also compromise safety. Drivers may experience symptoms like the 'Service Stability System' warning light illuminating, or erratic steering behavior. Ignoring this code could lead to further complications, including premature wear on steering components or complete loss of steering function, which poses a serious driving hazard. Therefore, addressing DTC C0770 promptly is crucial for vehicle safety and performance.

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

Symptoms

Common symptoms when C0770 is present:

Check engine light stays on constantly, potentially accompanied by a service stability system warning.
Steering wheel feels loose or unresponsive, making it difficult to maintain control when driving.
Vehicle exhibits erratic steering behavior, such as unexpected pulling to one side or difficulty making turns.
Increased wear on tires due to improper alignment caused by a faulty steering angle sensor.
Decreased fuel efficiency as the vehicle may be compensating for the erratic steering inputs.

Possible Causes

Most common causes of C0770 (ordered by frequency):

{'cause': 'Faulty Steering Angle Sensor', 'likelihood': '60%', 'details': 'The steering angle sensor itself may fail due to wear or internal defects, sending incorrect data to the ECU.'}
{'cause': 'Wiring Issues', 'details': 'Damaged wiring or poor connections in the steering angle sensor circuit can disrupt signal transmission.'}
{'cause': 'Calibration Issues', 'details': 'Sometimes, the sensor may require recalibration after maintenance or replacement of steering components.'}
{'cause': 'Steering Column Issues', 'details': "Less common issues like problems with the steering column itself could affect the sensor's operation."}
{'cause': 'ECU Malfunction', 'details': 'In rare cases, a fault in the vehicle’s ECU could misinterpret signals from the steering angle sensor.'}

C0770 Repair Costs

Cost Breakdown by Repair Type

Steering Angle Sensor Replacement

Replace the faulty steering angle sensor with an OEM or high-quality aftermarket part.

Total: $150 - $300
Success rate: 85%

Wiring Repair

Repair or replace damaged wiring or connectors in the steering angle sensor circuit.

Total: $100 - $200
Success rate: 75%

Calibration Service

Service to recalibrate the steering angle sensor after installation.

Total: $50 - $100
Success rate: 90%

Money-Saving Tips for C0770

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 C0770 Diagnosis Process

Follow these systematic steps to accurately diagnose C0770. 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 in the steering angle sensor circuit (5-10 minutes)

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