Quick Answer
C079D means: C079D indicates a malfunction in the power steering control system, often linked to the steering angle sensor.
Can I drive with C079D? Immediate attention is advised; driving without resolving this can lead to unsafe conditions.
Common Questions
What does C079D mean and how does it affect my car?
The C079D code indicates a problem in your vehicle's power steering system, typically affecting how easily you can steer. If left unaddressed, it can lead to serious handling issues, making driving unsafe.
What are the most common causes of C079D and how much does it cost to fix?
Common causes include a faulty steering angle sensor or electrical issues. Repair costs can range from $150 for sensor replacement to $600 for control module replacement.
Can I drive my car with C079D or should I stop immediately?
Driving with the C079D code can be risky, as it may lead to a loss of steering assist. It's best to address this issue as soon as possible to ensure safe driving.
How can I diagnose C079D myself using GeekOBD APP?
You can use the GeekOBD APP to scan for DTCs, view freeze frame data, and monitor live sensor readings to pinpoint issues related to the power steering system.
What vehicles are most commonly affected by C079D?
This code is frequently found in 2015-2020 Chevrolet and GMC models, such as the Silverado and Sierra. It's essential to check for any manufacturer recalls regarding steering issues.
How can I prevent C079D from happening again?
Regular maintenance of your vehicle's steering system, including checking fluid levels and inspecting connections, can help prevent the occurrence of this code.
What is C079D?
The DTC C079D code is a diagnostic trouble code that relates to the control module of the vehicle's power steering system. Specifically, it indicates a malfunction in the steering system, often due to issues with the steering angle sensor or the electronic power steering control module. When this code triggers, it can lead to a range of performance issues, including a loss of power steering assist, which can significantly affect the handling and maneuverability of the vehicle. This code is particularly common in Chevrolet and GMC models manufactured between 2015 and 2020, like the Silverado and Sierra. If you see this code, your vehicle might exhibit symptoms such as stiff steering, warning lights on the dashboard, or even a complete loss of steering assist. Ignoring this code can lead to further mechanical issues and potentially dangerous driving conditions, so it's essential to address it promptly. Drivers experiencing this code are often advised to check their vehicle's power steering fluid levels, inspect electrical connections, or visit a certified technician for a thorough diagnostic. Regular maintenance, including steering system inspections, can help in preventing the occurrence of this code.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C079D is present:
- Stiff steering wheel, making it difficult to turn, especially at low speeds.
- Warning lights on the dashboard, such as the power steering or check engine light, indicating a fault in the system.
- Increased steering effort required during turns, which can lead to driver fatigue and difficulties navigating.
- Unusual noises from the steering column, such as grinding or whining, which could indicate mechanical failure.
- Steering assist may intermittently engage and disengage, causing erratic steering response.
Possible Causes
Most common causes of C079D (ordered by frequency):
- Faulty steering angle sensor - This is the most common cause, with a likelihood of about 60%. A malfunctioning sensor can send incorrect data to the control module, leading to power steering issues.
- Electrical issues, such as damaged wiring or poor connections - These can disrupt the power steering system's operation and have a likelihood of around 25%. Regular checks can prevent these issues.
- Malfunctioning power steering control module - This component may fail due to wear and tear, with a likelihood of 10%. Keeping the vehicle's software updated can help prevent such failures.
- Low power steering fluid - Though less common, this can lead to poor steering performance. Regularly checking fluid levels is essential for prevention.
- Mechanical failures in the steering column - Rare but serious, this could involve broken gears or bearings, requiring immediate inspection.
C079D Repair Costs
Cost Breakdown by Repair Type
Steering Angle Sensor Replacement
Replacing the faulty steering angle sensor, which is often the root cause of DTC C079D.
- Total: $150 - $300
- Success rate: 85%
Power Steering Control Module Replacement
Replacing the control module if it is determined to be the source of the issue.
- Total: $300 - $600
- Success rate: 75%
Money-Saving Tips for C079D
- 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 C079D Diagnosis Process
Follow these systematic steps to accurately diagnose C079D. 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).
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).
Step 3: Step 3: Component testing - Use a multimeter to test the steering angle sensor and related components for proper voltage and resistance (20-30 minutes)
Step 3: Component testing - Use a multimeter to test the steering angle sensor and related components for proper voltage and resistance (20-30 minutes).
Step 4: Step 4: System function test - After repairs, verify proper operation of the steering system and clear codes (10-15 minutes)
Step 4: System function test - After repairs, verify proper operation of the steering system and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm the success of the repairs (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm the success of the repairs (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 a 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado, 75,000 miles
Problem: Customer reported a stiff steering wheel and warning lights on the dashboard.
Diagnosis: After scanning with the GeekOBD APP, the C079D code was confirmed, and the steering angle sensor was tested and found faulty.
Solution: Replaced the steering angle sensor with a new OEM part.
Cost: $250 (parts and labor included)
Result: The customer reported smooth steering and no warning lights after the repair.
Case Study 2: Power Steering Control Module Replacement in a 2018 GMC Sierra
Vehicle: 2018 GMC Sierra, 50,000 miles
Problem: Intermittent loss of power steering assist during turns.
Diagnosis: Diagnostic scan revealed C079D alongside other codes; further testing confirmed a failing control module.
Solution: Replaced the power steering control module and reprogrammed the vehicle's computer.
Cost: $500 (including parts and programming fees)
Result: Post-repair, the steering system functioned correctly with no further issues.