B0739 - Understanding DTC B0739: Common Issue in 2011-2016 Chevrolet Volt and Other Models

Quick Answer

B0739 means: DTC B0739 indicates a malfunction in the transmission range sensor circuit.

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

Can I drive with B0739? It's recommended to diagnose and repair this issue as soon as possible to avoid further complications.

Common Questions

What does B0739 mean and how does it affect my car?

DTC B0739 indicates a malfunction in the transmission range sensor circuit, which can lead to issues with shifting gears smoothly. If not addressed, it may result in more severe transmission problems and affect overall vehicle performance.

What are the most common causes of B0739 and how much does it cost to fix?

The most common cause of B0739 is a faulty transmission range sensor, which usually costs between $150 - $300 to replace. Other causes include damaged wiring and ECM malfunctions, which may vary in repair costs based on the complexity of the issue.

Can I drive my car with B0739 or should I stop immediately?

While you may still drive your vehicle, it's advised to limit your driving until the issue is diagnosed and repaired. Ignoring it can lead to severe transmission damage and higher repair costs.

How can I diagnose B0739 myself using GeekOBD APP?

To diagnose B0739 using the GeekOBD APP, connect the device to your car's OBD2 port, run a scan to retrieve the trouble codes, and analyze the freeze frame data to identify the conditions under which the fault occurred.

What vehicles are most commonly affected by B0739?

DTC B0739 is frequently reported in the 2011-2016 Chevrolet Volt, as well as some models of the Chevrolet Malibu and GMC Terrain from the same years.

How can I prevent B0739 from happening again?

Regular maintenance, including checking the transmission fluid levels and inspecting wiring connections, can help prevent B0739 from recurring. Keeping your vehicle's software updated is also crucial.

What is B0739?

DTC B0739 refers to a specific diagnostic trouble code that indicates a problem with the transmission range sensor circuit. This code is particularly relevant for vehicle owners of models like the 2011-2016 Chevrolet Volt, among others. The transmission range sensor, often known as the neutral safety switch, plays a crucial role in determining the current gear position of the vehicle. When this sensor malfunctions or the circuit experiences issues, it can lead to erratic shifting behavior or prevent the vehicle from starting altogether. In practical terms, if you're experiencing symptoms like the inability to shift gears smoothly, or if your check engine light comes on, it's essential to address this code promptly. Continuing to drive with a B0739 code can lead to more severe transmission issues or even complete failure, which can be costly and inconvenient. Overall, understanding the implications of this code can help you take proactive steps to ensure your vehicle operates safely and efficiently.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B0739 is present:

  • The check engine light illuminates and remains on, indicating a fault in the transmission system.
  • Shifting gears may become erratic, causing delays or sudden jerks during acceleration or deceleration.
  • Fuel economy may decrease significantly, often by 10-15%, due to improper shifting and engine management.
  • The vehicle may refuse to start or might only start in certain gears, indicating a safety feature is activated.
  • In some cases, the vehicle may enter limp mode, limiting speed and functionality to protect the transmission.

Possible Causes

Most common causes of B0739 (ordered by frequency):

  1. The most common cause of DTC B0739 is a faulty transmission range sensor, which occurs in about 60% of cases. This sensor can wear out or develop electrical faults over time, especially in older vehicles.
  2. Second, damaged wiring or poor connections in the transmission range sensor circuit can lead to incorrect readings. This issue might be due to corrosion or physical damage, which can happen from road debris or age.
  3. Another potential cause is a malfunctioning Engine Control Module (ECM) that misinterprets signals from the transmission range sensor. Regular maintenance checks can help prevent this issue.
  4. Less common but serious causes include a complete transmission failure, which may develop if the B0739 code is ignored for too long.
  5. A rare cause could be a software issue or glitch in the vehicle's computer system, which might require a software update or reprogramming.

B0739 Repair Costs

Cost Breakdown by Repair Type

Transmission Range Sensor Replacement

Replacing the faulty transmission range sensor to restore proper function.

  • Total: $150 - $300
  • Success rate: 85%
Wiring Repair or Replacement

Repairing or replacing damaged wiring or connectors in the circuit.

  • Total: $100 - $200
  • Success rate: 90%
Money-Saving Tips for B0739
  • 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 B0739 Diagnosis Process

Follow these systematic steps to accurately diagnose B0739. 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 around the transmission range sensor (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the transmission range sensor (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, which can help in pinpointing the issue (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, which can help in pinpointing the issue (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 measure the voltage and resistance of the transmission range sensor and inspect the wiring for continuity (20-30 minutes)

Step 3: Component testing - Use a multimeter to measure the voltage and resistance of the transmission range sensor and inspect the wiring for continuity (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 the proper operation of the transmission range sensor after repairs and clear codes to see if they reappear (10-15 minutes)

Step 4: System function test - Verify the proper operation of the transmission range sensor after repairs and clear codes to see if they reappear (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 that the transmission shifts smoothly and the check engine light remains off (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the transmission shifts smoothly and the check engine light remains off (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: Transmission Range Sensor Replacement on 2013 Chevrolet Volt

Vehicle: 2013 Chevrolet Volt, 85,000 miles

Problem: Customer reported the check engine light was on and the vehicle was experiencing shifting issues.

Diagnosis: After performing an OBD2 scan with the GeekOBD APP, the technician confirmed the B0739 code and found the transmission range sensor was faulty.

Solution: Replaced the transmission range sensor, ensuring all connections were secure.

Cost: $250 (parts: $150, labor: $100)

Result: The vehicle shifted smoothly after the repair, and the check engine light remained off.

Case Study 2: Wiring Repair on 2015 GMC Terrain

Vehicle: 2015 GMC Terrain, 65,000 miles

Problem: Customer experienced difficulty shifting gears and noticed the check engine light was illuminated.

Diagnosis: An OBD2 scan revealed the B0739 code. The technician discovered that the wiring for the transmission range sensor had corrosion.

Solution: Repaired the damaged wiring and ensured proper connection to the sensor.

Cost: $150 (parts: $50, labor: $100)

Result: Post-repair, the customer reported smooth shifting and no further issues.

Diagnose B0739

Use GeekOBD APP for professional diagnosis!

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

Code: B0739
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH - IGNORING THIS CODE CAN LEAD TO SIGNIFICANT TRANSMISSION PROBLEMS.
Category: Body Codes