Quick Answer
C0758 means: C0758 indicates a malfunction in the transmission control system related to the shift solenoid 'B'.
Can I drive with C0758? Immediate attention is recommended to avoid further transmission damage.
Common Questions
What does C0758 mean and how does it affect my car?
The C0758 code signifies a malfunction in the transmission control system that can cause harsh shifting or even complete transmission failure. If this code is present, it can affect your car's performance, leading to increased wear on the transmission and potentially costly repairs if not addressed promptly.
What are the most common causes of C0758 and how much does it cost to fix?
The most common cause is a faulty shift solenoid, which often costs between $150 and $400 to fix. Other causes include wiring issues and transmission control module failures, which can be more expensive, reaching up to $1200. Regular maintenance can help prevent these issues.
Can I drive my car with C0758 or should I stop immediately?
It's advisable to stop driving your vehicle if the C0758 code appears. Continuing to drive can lead to severe transmission damage, resulting in higher repair costs and potential safety hazards.
How can I diagnose C0758 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan your vehicle for codes, review freeze frame data, and run tests on your shift solenoid and wiring. The app can provide insights into the code and help guide you through the diagnostic process.
What vehicles are most commonly affected by C0758?
This code is frequently seen in 2007-2015 Chevrolet Silverado models, as well as other GM vehicles from similar years. Knowing this can help you stay alert to potential issues if you own one of these vehicles.
How can I prevent C0758 from happening again?
To prevent the C0758 code from recurring, ensure regular maintenance on your vehicle's transmission system. This includes checking fluid levels, replacing old fluid, and inspecting wiring and connectors for signs of wear.
What is C0758?
The diagnostic trouble code (DTC) C0758 refers to an issue within the transmission control system, specifically related to the shift solenoid. This code indicates that the vehicle's onboard diagnostics (OBD-II) system has detected a malfunction in the electrical circuit of the shift solenoid 'B', which can lead to improper shifting or even complete transmission failure. This code is common in vehicles like the 2007-2015 Chevrolet Silverado, but can also appear in other makes and models with similar transmission systems. When C0758 is triggered, the transmission may not respond correctly, resulting in harsh or delayed shifting. In some cases, you may also notice that the vehicle enters 'limp mode', where it restricts performance to prevent further damage. Drivers may experience symptoms such as engine performance issues, increased fuel consumption, and even difficulty in changing gears. Understanding this code is crucial as it can lead to significant repair costs if not addressed promptly. Ignoring the C0758 code can result in further damage to the transmission and related components, leading to more expensive repairs down the line.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0758 is present:
- Check engine light stays on constantly, signaling an issue that needs immediate attention.
- Transmission hesitates during acceleration, making it difficult to maintain speed or shift gears smoothly.
- Fuel economy decreased by 10-15%, leading to higher fuel costs than usual.
- Unusual noises from the transmission area, such as grinding or whining, which indicates potential mechanical failure.
- Transmission slips unexpectedly, causing a loss of power while driving, which can be dangerous.
Possible Causes
Most common causes of C0758 (ordered by frequency):
- {'cause': "Faulty shift solenoid 'B'", 'likelihood': '70%', 'details': 'This is the most common cause of the C0758 code, where the solenoid may become stuck or fail electrically, leading to improper shifting.'}
- {'cause': 'Wiring issues or poor connections', 'technicalExplanation': 'Corroded or damaged wiring can disrupt the signal from the transmission control module to the shift solenoid, triggering the C0758 code.'}
- {'cause': 'Transmission fluid issues', 'preventionTips': 'Ensure regular maintenance of the transmission fluid levels and quality to prevent overheating and solenoid failure.'}
- {'cause': 'Faulty transmission control module (TCM)', 'seriousCause': 'While less common, a malfunctioning TCM can lead to multiple shift solenoid codes and requires immediate action.'}
- {'cause': 'Mechanical transmission failure', 'rareCause': 'In rare cases, internal transmission components may wear out, causing the system to fail and trigger the C0758 code.'}
C0758 Repair Costs
Cost Breakdown by Repair Type
Replace Shift Solenoid 'B'
Replacing the faulty shift solenoid is often the most effective solution.
- Total: $150 - $400
- Success rate: 85%
Wiring Repair
Repairing damaged wiring can resolve the issue if the solenoid is functional.
- Total: $100 - $200
- Success rate: 75%
Transmission Control Module Replacement
In cases of a faulty TCM, replacement is necessary.
- Total: $600 - $1200
- Success rate: 90%
Money-Saving Tips for C0758
- 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 C0758 Diagnosis Process
Follow these systematic steps to accurately diagnose C0758. 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 shift solenoid and wiring for continuity and resistance (20-30 minutes)
Step 3: Component testing - Use a multimeter to test the shift solenoid and wiring for continuity and resistance (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no codes reappear (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no codes reappear (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: Chevrolet Silverado 2010 C0758 Repair Case
Vehicle: 2010 Chevrolet Silverado, 85,000 miles
Problem: Customer complained of harsh shifting and check engine light on.
Diagnosis: After scanning with GeekOBD APP, the C0758 code was confirmed. A visual inspection revealed corroded wiring.
Solution: Replaced the damaged wiring and shift solenoid 'B'.
Cost: $350 (including parts and labor)
Result: The vehicle shifted smoothly after repairs, and the check engine light was cleared.
Case Study 2: GMC Sierra 2013 Transmission Issue
Vehicle: 2013 GMC Sierra, 60,000 miles
Problem: Customer reported slipping transmission and check engine light.
Diagnosis: OBD scan revealed C0758. Testing showed a faulty shift solenoid.
Solution: Replaced the shift solenoid and performed a transmission fluid change.
Cost: $250 (parts and labor included)
Result: Subsequent road tests confirmed that the issue was resolved, with no codes reappearing.