P086B - Transmission Fluid Pressure Sensor Range/Performance Problem

Quick Answer

P086B means: P086B signifies a transmission fluid pressure sensor issue, indicating that the sensor readings are outside the normal range.

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

Can I drive with P086B? Immediate attention is recommended to avoid further transmission damage.

Common Questions

What does P086B mean and how does it affect my car?

The P086B code indicates a problem with the transmission fluid pressure sensor, which is critical for the transmission's operation. If this sensor is malfunctioning, your vehicle may experience erratic shifting, decreased fuel efficiency, or even lead to transmission failure if left unattended. This can affect your car's performance and reliability.

What are the most common causes of P086B and how much does it cost to fix?

Common causes of P086B include a faulty transmission fluid pressure sensor, wiring issues, and low or contaminated transmission fluid. Repair costs can vary widely, with sensor replacements ranging from $150 to $300, while wiring repairs could run between $100 and $250.

Can I drive my car with P086B or should I stop immediately?

It is advisable to stop driving your vehicle if the P086B code is present. Continuing to drive with a faulty transmission fluid pressure sensor could lead to severe transmission damage, potentially resulting in costly repairs.

How can I diagnose P086B myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for trouble codes and retrieve freeze frame data to understand the context of the P086B code. Follow up with a visual inspection and component testing to narrow down the issue, using the app to monitor sensor readings in real time.

What vehicles are most commonly affected by P086B?

Vehicles commonly affected by the P086B code include the 2015-2018 Chevrolet Silverado, 2013-2016 Dodge Ram 1500, and other models from various manufacturers that utilize similar transmission systems. Check for any recalls or technical service bulletins (TSBs) related to your specific vehicle.

How can I prevent P086B from happening again?

To prevent the P086B code from reappearing, ensure regular maintenance of your transmission system, including timely fluid changes and inspection of the wiring and connectors. Keeping an eye on fluid levels and quality can also help maintain proper sensor function.

What is P086B?

The diagnostic trouble code P086B indicates a problem with the transmission fluid pressure sensor circuit. This code is often triggered when the Engine Control Module (ECM) detects that the transmission fluid pressure does not fall within the expected range. A healthy transmission relies on proper fluid pressure to shift gears smoothly and efficiently. When this pressure is outside of the normal parameters, it can lead to erratic shifting, reduced fuel efficiency, and potential damage to the transmission. Commonly, vehicles like the 2015-2018 Chevrolet Silverado and the 2013-2016 Dodge Ram 1500 are known to exhibit this issue. If the P086B code appears, it is crucial to address it promptly, as neglecting the problem can exacerbate transmission wear or lead to complete failure. Drivers may experience symptoms such as difficulty in shifting, slipping gears, or even complete transmission failure if the issue is severe. Regular maintenance and timely diagnostics can help prevent these costly repairs.

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

Symptoms

Common symptoms when P086B is present:

  • Check engine light illuminated - The check engine light may stay on constantly when P086B is triggered, indicating a need for inspection.
  • Harsh or slipping transmission shifts - You may notice that your vehicle's transmission hesitates or slips unexpectedly during acceleration.
  • Increased fuel consumption - A significant drop in fuel efficiency, potentially 10-15%, may be observed due to the transmission working harder than necessary.
  • Difficulty in engaging gears - You might experience challenges when trying to shift into or out of gear, which can be alarming while driving.
  • Unusual noises from the transmission - Grinding or whining noises might be present as the transmission struggles to operate correctly.

Possible Causes

Most common causes of P086B (ordered by frequency):

  1. Faulty transmission fluid pressure sensor (60%) - The most common cause of the P086B code is a malfunctioning sensor that provides inaccurate readings to the ECM.
  2. Wiring issues (20%) - Damaged or corroded wiring and connectors in the transmission fluid pressure sensor circuit can lead to erroneous signals.
  3. Transmission fluid level or quality (10%) - Low or contaminated transmission fluid can cause pressure fluctuations, triggering the code.
  4. Software issues (5%) - Occasionally, the vehicle's software may need an update to properly read sensor data.
  5. Transmission failure (5%) - In rare cases, internal transmission problems may cause abnormal pressure readings, requiring extensive repairs.

P086B Repair Costs

Cost Breakdown by Repair Type

Sensor Replacement

Replacing a faulty transmission fluid pressure sensor is often the most straightforward solution.

  • Total: $150 - $300
  • Success rate: 90%
Wiring Repair

Repairing damaged wiring or connectors in the sensor circuit may be necessary if the wiring is compromised.

  • Total: $100 - $250
  • Success rate: 85%
Fluid Change

Flushing and replacing old transmission fluid can improve performance if fluid quality is an issue.

  • Total: $80 - $150
  • Success rate: 75%
Money-Saving Tips for P086B
  • 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 P086B Diagnosis Process

Follow these systematic steps to accurately diagnose P086B. 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 to test the transmission fluid pressure sensor and its circuit for proper voltage and resistance (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the transmission fluid pressure sensor and its circuit for proper voltage and resistance (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, ensuring the sensor reads accurately (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes, ensuring the sensor reads accurately (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 issue has been resolved successfully (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the issue has been resolved successfully (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: P086B Code in a 2016 Chevrolet Silverado

Vehicle: 2016 Chevrolet Silverado 1500, 45,000 miles

Problem: Customer reported erratic shifting and check engine light illuminated.

Diagnosis: Diagnosis revealed a faulty transmission fluid pressure sensor was sending incorrect signals to the ECM.

Solution: Replaced the transmission fluid pressure sensor and cleared the codes. Conducted a road test to ensure smooth operation.

Cost: $250 (sensor replacement and labor)

Result: Customer reported improved shifting performance and no recurrence of the check engine light.

Case Study 2: P086B Code in a 2014 Dodge Ram 1500

Vehicle: 2014 Dodge Ram 1500, 70,000 miles

Problem: Customer experienced slipping transmission and poor acceleration.

Diagnosis: Found damaged wiring in the transmission fluid pressure sensor circuit.

Solution: Repaired the wiring and replaced the sensor. Flushed and replaced the transmission fluid as a precaution.

Cost: $350 (wiring repair and sensor replacement)

Result: Vehicle performance restored, and customer reported no further issues.

Diagnose P086B

Use GeekOBD APP for professional diagnosis!

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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P086B
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes