Quick Answer
B079B means: B079B indicates a malfunction in the transmission range sensor circuit, affecting gear detection.
Can I drive with B079B? Address immediately to prevent transmission failure.
Common Questions
What does B079B mean and how does it affect my car?
B079B indicates a problem with the transmission range sensor circuit. This can lead to gear shifting issues, affecting the vehicle's drivability and potentially causing further transmission problems if not addressed promptly.
What are the most common causes of B079B and how much does it cost to fix?
The most common cause of B079B is a faulty transmission range sensor, which can cost between $150 and $300 to replace. Wiring issues also contribute significantly, while less frequently, the TCM may need replacement, which can be a more expensive repair.
Can I drive my car with B079B or should I stop immediately?
Driving with a B079B code is not recommended as it can lead to erratic transmission behavior. It's best to address the issue as soon as possible to prevent further damage and ensure your safety.
How can I diagnose B079B myself using GeekOBD APP?
You can use the GeekOBD APP to scan for error codes, view freeze frame data, and monitor the transmission range sensor's performance in real-time, helping you identify the root cause of the B079B code.
What vehicles are most commonly affected by B079B?
B079B is commonly found in models like the 2015-2018 Honda Civic and the 2016-2018 Toyota Corolla. It's advisable to check for any recalls or technical service bulletins related to transmission issues in these vehicles.
How can I prevent B079B from happening again?
Regular maintenance, including periodic inspections of the transmission system and ensuring proper fluid levels, can help prevent issues related to the B079B code. Additionally, promptly addressing any signs of electrical problems can be beneficial.
What is B079B?
The B079B diagnostic trouble code (DTC) is related to the Transmission Control Module (TCM) and indicates a malfunction in the transmission range sensor circuit. When this code appears, it typically means that the TCM is unable to detect the current position of the gear shift lever, which can lead to transmission issues. In practical terms, if you see this code on your dashboard, it can cause problems with shifting gears, leading to erratic transmission behavior. This could be particularly noticeable in models like the 2015-2018 Honda Civic or the 2016-2018 Toyota Corolla. Owners may experience difficulty in shifting into or out of park or may find that their vehicle unexpectedly shifts gears while driving. It's important to address this code quickly, as ignoring it can lead to more significant transmission problems down the line. Not only does it affect drivability, but it can also lead to potentially costly repairs if the issue is not resolved. Therefore, understanding the B079B code is crucial for maintaining vehicle performance and safety.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B079B is present:
- Check engine light illuminates on the dashboard, indicating a fault.
- Difficulty shifting gears, such as being unable to switch from park to drive without effort.
- Unusual transmission behavior, like slipping or harsh shifting during acceleration.
- Increased engine RPM when trying to accelerate without increased vehicle speed.
- Transmission fails to engage or disengage properly, leading to potential safety hazards.
Possible Causes
Most common causes of B079B (ordered by frequency):
- Faulty transmission range sensor is the most common cause, with a 60% likelihood. This sensor provides critical data to the TCM.
- Wiring issues, such as damaged or corroded connections, account for about 25% of cases. Inspecting wiring can often reveal shorts or breaks.
- Improper installation or adjustments during previous repairs may lead to issues, which can be prevented by following manufacturer specifications.
- Less common but serious causes include a malfunctioning TCM, which can lead to significant repair costs and may require replacement.
- Rare causes could involve internal transmission damage, which is a more complex and expensive fix.
B079B Repair Costs
Cost Breakdown by Repair Type
Transmission Range Sensor Replacement
Replacing the faulty transmission range sensor is often required to resolve the B079B code.
- Total: $150 - $300
- Success rate: 90%
Wiring Repair
Repairing damaged wiring or connectors can be necessary if electrical issues are found.
- Total: $50 - $150
- Success rate: 85%
TCM Replacement
In rare cases, replacing the TCM may be necessary if it is found to be faulty.
- Total: $500 - $1,200
- Success rate: 75%
Money-Saving Tips for B079B
- 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 B079B Diagnosis Process
Follow these systematic steps to accurately diagnose B079B. 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 or specific diagnostic tools to test the transmission range sensor and associated wiring (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission range sensor and associated wiring (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 the transmission operates smoothly (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the transmission operates smoothly (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: Transmission Range Sensor Replacement in a 2017 Honda Civic
Vehicle: 2017 Honda Civic, 45,000 miles
Problem: Customer reported difficulty shifting into drive and frequent check engine light.
Diagnosis: Diagnostic scan revealed B079B code. Visual inspection showed a faulty transmission range sensor.
Solution: Replaced the transmission range sensor and cleared DTCs. Conducted a road test to verify the repair.
Cost: $250 (sensor $200, labor $50)
Result: Customer reported smooth shifting and no further check engine light.
Case Study 2: Wiring Repair for a 2016 Toyota Corolla
Vehicle: 2016 Toyota Corolla, 60,000 miles
Problem: Vehicle would not shift from park to drive.
Diagnosis: Found B079B code; inspection revealed damaged wiring harness.
Solution: Repaired the damaged wiring and ensured all connections were secure before testing.
Cost: $100 (labor and parts)
Result: Issue resolved, and vehicle shifted smoothly after repair.