P079B - DTC P079B - Understanding the Transmission Fluid Temperature Sensor Range/Performance Code in Honda and Acura Models

Quick Answer

P079B means: P079B indicates a transmission fluid temperature sensor issue, affecting the transmission's performance.

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

Can I drive with P079B? Immediate attention is recommended to prevent further transmission damage.

Common Questions

What does P079B mean and how does it affect my car?

DTC P079B indicates a problem with the transmission fluid temperature sensor, which can lead to erratic shifting and potential transmission damage if not addressed. The immediate impact can include poor acceleration and reduced fuel efficiency, while long-term effects may include costly repairs or transmission replacement.

What are the most common causes of P079B and how much does it cost to fix?

Common causes of P079B include a faulty temperature sensor, wiring issues, and low transmission fluid. Repair costs can range from $80 to $300, depending on the specific issue and repairs needed.

Can I drive my car with P079B or should I stop immediately?

While you might be able to drive with this code, it is highly recommended to address it immediately as continued driving can lead to severe transmission damage and costly repairs.

How can I diagnose P079B myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a full OBD2 scan to retrieve the P079B code and view freeze frame data. This information will help you understand the conditions that triggered the code and guide your next steps for diagnosis.

What vehicles are most commonly affected by P079B?

P079B is frequently encountered in 2015-2018 Honda Accord and Acura TLX models. These vehicles are known to have issues with their transmission fluid temperature sensors, and some may even have recalls related to this code.

How can I prevent P079B from happening again?

Regularly check and maintain your transmission fluid levels, ensure that the fluid is changed according to the manufacturer's recommended intervals, and perform periodic inspections of wiring and connectors to prevent future issues.

What is P079B?

The Diagnostic Trouble Code (DTC) P079B indicates a problem with the transmission fluid temperature (TFT) sensor range/performance. This code is commonly associated with various Honda and Acura vehicles manufactured between 2015 and 2018. When the Engine Control Module (ECM) detects that the temperature readings from the TFT sensor are outside the expected range or performance parameters, it triggers this code. This can lead to various issues, including poor transmission performance, increased wear on transmission components, or even transmission failure. The TFT sensor is crucial for ensuring that the transmission operates at optimal temperatures, which is essential for smooth shifting and overall vehicle performance. If the transmission fluid overheats or is too cold, it can lead to erratic shifting, slipping, or even total transmission failure. In the real world, if you see this code, it's critical to address the issue promptly to avoid more extensive and costly repairs down the line.

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

Symptoms

Common symptoms when P079B is present:

The check engine light stays on constantly, indicating a fault that needs attention.
Engine hesitates during acceleration, leading to a frustrating driving experience.
Fuel economy decreased by 10-15%, costing you more at the pump.
Erratic shifting patterns, such as slipping or hard shifts, which can make driving unpredictable.
Strange noises from the transmission, which could indicate severe internal issues.

Possible Causes

Most common causes of P079B (ordered by frequency):

{'cause': 'Faulty transmission fluid temperature sensor (40% likelihood)', 'details': 'This is the most common cause of the P079B code, where the sensor may fail to provide accurate temperature readings.'}
{'cause': 'Wiring issues (30% likelihood)', 'details': 'Damaged or corroded wiring can disrupt the signal from the TFT sensor to the ECM, leading to erroneous readings.'}
{'cause': 'Low transmission fluid (20% likelihood)', 'details': 'Insufficient fluid can cause incorrect temperature readings, leading to potential overheating and damage.'}
{'cause': 'Transmission control module malfunction (5% likelihood)', 'details': 'A failure in the TCM can lead to misinterpretation of the sensor readings.'}
{'cause': 'Overheating issues (5% likelihood)', 'details': 'Excessive heat can damage the sensor or wiring, causing performance issues.'}

P079B Repair Costs

Cost Breakdown by Repair Type

TFT Sensor Replacement

Replacing the faulty transmission fluid temperature sensor can resolve the P079B code.

Total: $150 - $300
Success rate: 85%

Wiring Repair

Repairing damaged wiring or connections related to the TFT sensor.

Total: $100 - $200
Success rate: 75%

Fluid Replacement

Replacing low or contaminated transmission fluid to prevent overheating.

Total: $80 - $150
Success rate: 70%

Money-Saving Tips for P079B

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 P079B Diagnosis Process

Follow these systematic steps to accurately diagnose P079B. 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).