C0791 - Steering Angle Sensor Fault in Popular Vehicles Like Chevrolet and GMC

Quick Answer

C0791 means: C0791 signifies a fault in the steering angle sensor, affecting vehicle stability.

Fix: Check and replace faulty components Cost: $200 - $500 Time: 90-180 minutes

Can I drive with C0791? Immediate attention is recommended to ensure safety.

Common Questions

What does C0791 mean and how does it affect my car?

DTC C0791 indicates a fault in your steering angle sensor, which plays a crucial role in your vehicle's stability control. If this sensor fails, it can lead to poor vehicle handling and increased accident risk. It's essential to address this code promptly to ensure your safety on the road.

What are the most common causes of C0791 and how much does it cost to fix?

The leading cause of C0791 is a faulty steering angle sensor, with repair costs generally ranging from $200 to $500. Other causes may include damaged wiring or incorrect calibration after repairs, which can also lead to similar costs depending on the complexity of the issue.

Can I drive my car with C0791 or should I stop immediately?

While it's possible to drive with C0791, it's not advisable as it compromises your vehicle's stability control. If you notice handling issues or warning lights, it's best to have the vehicle inspected immediately to avoid potential accidents.

How can I diagnose C0791 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform an OBD2 scan to retrieve the C0791 code. The app will help you analyze freeze frame data, allowing you to understand the context of the fault. Look for any related codes or symptoms that might give further insight into the issue.

What vehicles are most commonly affected by C0791?

DTC C0791 is frequently reported in vehicles like the 2014-2018 Chevrolet Silverado and the 2015-2019 GMC Sierra. Owners of these models should be particularly vigilant for symptoms related to steering issues.

How can I prevent C0791 from happening again?

Regular maintenance of your vehicle's steering system is key to preventing C0791. Ensure that all connections are clean and secure, and have your vehicle's alignment checked periodically. Additionally, recalibrate the steering angle sensor after any repairs to suspension or steering components.

What is C0791?

DTC C0791 indicates a problem with the steering angle sensor, a critical component in your vehicle's stability control system. This sensor monitors the angle of the steering wheel and sends this information to the vehicle's computer. When the C0791 code is triggered, it often means that there is a malfunction in the sensor or the circuit that connects it to the engine control module (ECM). This issue can lead to several real-world implications, such as reduced handling and stability, especially during emergency maneuvers. Moreover, if this code appears, you might notice the traction control light or ABS warning light illuminating on your dashboard. This is particularly common in vehicles like the 2014-2018 Chevrolet Silverado and the 2015-2019 GMC Sierra. Ignoring this code can result in compromised driving safety, as the vehicle's stability control system may not function correctly, increasing the risk of accidents. Therefore, addressing DTC C0791 promptly is crucial for maintaining vehicle safety and performance.

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

Symptoms

Common symptoms when C0791 is present:

  • The check engine light or stability control light remains illuminated, indicating a malfunction.
  • The vehicle may experience erratic handling or unintended steering responses, making driving feel unstable.
  • Drivers might notice a decrease in traction control effectiveness, particularly in wet or slippery conditions.
  • In some cases, the vehicle may enter 'limp mode' to prevent further damage, limiting speed and power.
  • You might also hear unusual noises coming from the steering column or feel resistance while turning the steering wheel.

Possible Causes

Most common causes of C0791 (ordered by frequency):

  1. The most common cause of DTC C0791 is a faulty steering angle sensor, which is responsible for detecting the steering wheel's position (approximately 70% likelihood).
  2. Another frequent cause is damaged wiring or poor connections in the sensor circuit, which can lead to intermittent failures.
  3. Improper calibration after repairs or steering component replacement may also trigger this code, highlighting the importance of thorough diagnostics.
  4. Less common but serious causes include a malfunctioning ECM or issues within the vehicle's stability control module.
  5. In rare cases, software glitches in the vehicle's control modules can lead to false readings from the sensor.

C0791 Repair Costs

Cost Breakdown by Repair Type

Steering Angle Sensor Replacement

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

  • Total: $200 - $500
  • Success rate: 95%
Money-Saving Tips for C0791
  • 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 C0791 Diagnosis Process

Follow these systematic steps to accurately diagnose C0791. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for any obvious signs such as damaged wiring, loose connections, or corrosion in the steering angle sensor circuit, taking about 5-10 minutes

Step 1: Initial visual inspection - Check for any obvious signs such as damaged wiring, loose connections, or corrosion in the steering angle sensor circuit, taking about 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: Perform an OBD2 scan with the GeekOBD APP - Retrieve all codes and analyze the freeze frame data to understand the fault context, which usually takes 10-15 minutes

Step 2: Perform an OBD2 scan with the GeekOBD APP - Retrieve all codes and analyze the freeze frame data to understand the fault context, which usually takes 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 to check the voltage and resistance of the steering angle sensor, which may take 20-30 minutes

Step 3: Component testing - Use a multimeter to check the voltage and resistance of the steering angle sensor, which may take 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: Conduct a system function test - Verify the proper operation of the steering angle sensor after any repairs and clear the codes, generally 10-15 minutes

Step 4: Conduct a system function test - Verify the proper operation of the steering angle sensor after any repairs and clear the codes, generally 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 the fix and ensure that the warning lights remain off, taking about 15-20 minutes

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the fix and ensure that the warning lights remain off, taking about 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 2017 Chevrolet Silverado

Vehicle: 2017 Chevrolet Silverado 1500, 45,000 miles

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

Diagnosis: After scanning the vehicle, DTC C0791 was found. A visual inspection revealed damaged wiring to the steering angle sensor.

Solution: Replaced the damaged wiring and installed a new steering angle sensor, followed by a calibration using the manufacturer's software.

Cost: $400 (including parts and labor for a 3-hour job)

Result: The warning lights were cleared, and the vehicle's handling was restored to normal.

Case Study 2: Calibration Issue in 2016 GMC Sierra

Vehicle: 2016 GMC Sierra 1500, 60,000 miles

Problem: Customer complained of intermittent stability control warning lights and erratic steering response.

Diagnosis: DTC C0791 was confirmed via scan; further inspection showed that the sensor had been improperly calibrated after a previous repair.

Solution: Re-calibrated the steering angle sensor and performed a system check to ensure proper functionality.

Cost: $150 (calibration service only)

Result: The stability control system functioned correctly after calibration, and the customer reported no further issues.

Diagnose C0791

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: C0791
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes