Quick Answer

P0758 means: DTC P0758 relates to a malfunction in the shift solenoid B circuit of the transmission.

Fix: Check and replace faulty components Cost: $150 - $400 Time: 90-180 minutes

Can I drive with P0758? Immediate attention is recommended to prevent further transmission damage.

Common Questions

What does P0758 mean and how does it affect my car?

P0758 indicates a problem with the transmission shift solenoid B. This can lead to poor shifting performance, increased fuel consumption, and potential transmission damage if not addressed promptly.

What are the most common causes of P0758 and how much does it cost to fix?

Common causes include a faulty shift solenoid, wiring issues, and low transmission fluid. Repair costs typically range from $150 to $800 depending on the specific issue.

Can I drive my car with P0758 or should I stop immediately?

It’s advisable to stop driving the vehicle as continuing could lead to further damage. If the vehicle is in limp mode, it should be towed to a repair facility.

How can I diagnose P0758 myself using GeekOBD APP?

Using the GeekOBD APP, connect to your vehicle and read the diagnostic trouble codes. Check for freeze frame data to understand the conditions under which the code triggered.

What vehicles are most commonly affected by P0758?

Commonly seen in 2007-2019 Ford Focus, Chevrolet Malibu, and GMC Terrain models. Always check for manufacturer recalls or Technical Service Bulletins (TSBs) related to transmission issues.

How can I prevent P0758 from happening again?

Regular maintenance, including fluid changes and inspections, can help prevent issues. It’s also wise to monitor your transmission performance for any signs of trouble early on.

What is P0758?

DTC P0758 indicates a malfunction in the transmission control system, specifically related to the shift solenoid B circuit. This code typically arises when the Engine Control Module (ECM) detects that the solenoid is either stuck in the 'on' position or is not responding to control signals. When the solenoid fails, it can lead to various driving issues, such as erratic shifting, slipping, or even complete loss of drive. This situation can be particularly concerning in automatic vehicles, as it affects overall drivability and safety. The solenoid's role is critical as it controls the flow of transmission fluid to the appropriate gears based on vehicle speed and load. If the transmission is unable to shift properly, it may cause the engine to rev higher than normal without a corresponding increase in vehicle speed. Long-term neglect of this issue can lead to serious transmission damage, resulting in costly repairs. Understanding and addressing this code promptly can save car owners from more extensive repairs and ensure their vehicle remains safe and efficient on the road.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0758 is present:

  • The check engine light illuminates and stays on, indicating a transmission issue that cannot be ignored.
  • Drivers may experience rough or hard shifting, leading to a noticeable delay in acceleration during gear changes.
  • Fuel economy may decrease significantly, often by 10-15%, as the vehicle struggles to find the appropriate gear.
  • In severe cases, the vehicle may go into 'limp mode,' restricting speed to protect the transmission from damage.
  • Unusual noises from the transmission, such as grinding or whining, which can signal further mechanical failures.

Possible Causes

Most common causes of P0758 (ordered by frequency):

  1. {'cause': 'Faulty shift solenoid B', 'likelihood': '60%', 'details': 'The most common issue arises from a defective solenoid, which can fail due to wear or electrical faults.'}
  2. {'cause': 'Wiring issues or poor connections', 'details': 'Damaged wiring or corroded connectors can interrupt the signal between the ECM and the solenoid, causing malfunction.'}
  3. {'cause': 'Transmission fluid problems', 'prevention': 'Regularly check and change the transmission fluid to prevent overheating and solenoid failure.'}
  4. {'cause': 'ECM malfunction', 'details': 'Although rare, a failing ECM can cause incorrect signals to be sent to the solenoid, leading to its failure.'}
  5. {'cause': 'Clogged transmission filter or fluid contamination', 'details': "Dirty fluid can hinder the solenoid's operation, leading to erratic shifting and overheating."}

P0758 Repair Costs

Cost Breakdown by Repair Type

Shift Solenoid Replacement

Replacing the faulty shift solenoid B to restore proper transmission function.

  • Total: $150 - $400
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring and connectors to ensure proper electrical signal.

  • Total: $100 - $300
  • Success rate: 85%
ECM Reprogramming

Reprogramming or replacing the ECM if it is found to be faulty.

  • Total: $300 - $800
  • Success rate: 75%
Money-Saving Tips for P0758
  • 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 P0758 Diagnosis Process

Follow these systematic steps to accurately diagnose P0758. 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 shift solenoid and wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the shift solenoid and 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 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).

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 repair success (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (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: Shift Solenoid Replacement in a 2015 Ford Fusion

Vehicle: 2015 Ford Fusion, 80,000 miles

Problem: The customer reported erratic shifting and a check engine light.

Diagnosis: An OBD2 scan revealed code P0758. Visual inspection showed corrosion on the solenoid connector.

Solution: Replaced the shift solenoid B and cleaned the connector. Transmission fluid was also replaced.

Cost: $250 for parts and labor.

Result: The vehicle shifted smoothly post-repair, and the check engine light was cleared.

Case Study 2: Wiring Repair on a 2016 Chevrolet Malibu

Vehicle: 2016 Chevrolet Malibu, 65,000 miles

Problem: Customer experienced slipping during acceleration and a check engine light.

Diagnosis: P0758 code was retrieved. A thorough wiring inspection revealed frayed wires leading to the solenoid.

Solution: Repaired the damaged wiring and replaced the transmission fluid.

Cost: $180 for repairs.

Result: The Malibu's performance improved significantly, with no further issues detected.

Diagnose P0758

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis

Code Information

Code: P0758
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes