P0855 - Transmission Range Sensor Circuit A Malfunction in Common Vehicles like Honda Accord and Toyota Camry

Quick Answer

P0855 means: P0855 indicates a malfunction in the transmission range sensor circuit 'A'.

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

Can I drive with P0855? Immediate attention is advised to prevent further transmission issues.

Common Questions

What does P0855 mean and how does it affect my car?

The P0855 code indicates a malfunction in the transmission range sensor circuit. This can lead to erratic shifting, starting issues, and even prevent the vehicle from starting altogether. In the long run, ignoring this code can result in extensive transmission damage.

What are the most common causes of P0855 and how much does it cost to fix?

The most common causes include a faulty transmission range sensor, damaged wiring, or issues with the TCM/ECM. Repair costs can range from $100 to $300 depending on the specific repairs needed.

Can I drive my car with P0855 or should I stop immediately?

Driving with a P0855 code is not advisable as it can lead to poor performance and further damage to your transmission. It’s best to address this issue promptly.

How can I diagnose P0855 myself using GeekOBD APP?

You can use the GeekOBD APP to scan for codes, view live data, and analyze the transmission range sensor's performance. Look for consistent readings that match the gear you’re in and check for any irregularities.

What vehicles are most commonly affected by P0855?

Commonly affected vehicles include the 2004-2008 Honda Accord, 2007-2012 Toyota Camry, and various models from Ford and Chevrolet. It's wise to check for any recalls or technical service bulletins related to this code.

How can I prevent P0855 from happening again?

Regular maintenance, including checking wiring and connections related to the transmission range sensor, can help prevent issues. Additionally, keep an eye on fluid levels and quality, as transmission fluid can affect sensor performance.

What is P0855?

The P0855 diagnostic trouble code (DTC) indicates a malfunction in the transmission range sensor circuit, specifically in the 'A' circuit. This sensor plays a crucial role in determining the position of the transmission gear, whether it's in Park, Drive, or Reverse. When the transmission control module (TCM) or the engine control module (ECM) detects a discrepancy in the signal from the range sensor, it triggers the P0855 code. Drivers may notice several real-world implications, including unexpected gear shifts, difficulty in starting the vehicle, or the inability to shift into certain gears. For instance, in vehicles like the 2004-2008 Honda Accord or the 2007-2012 Toyota Camry, this issue can lead to a no-start condition if the sensor misreads the gear position. It's essential to address this code promptly, as ignoring it can lead to further transmission damage and costly repairs down the line. Effective diagnosis often involves checking the wiring and connections associated with the transmission range sensor, as well as testing the sensor itself for proper operation.

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

Symptoms

Common symptoms when P0855 is present:

  • The check engine light illuminates, remaining lit continuously, indicating an issue with the transmission range sensor.
  • The vehicle may hesitate or refuse to start, especially in cold weather, due to incorrect gear position readings.
  • Drivers might experience harsh or erratic shifting, making it difficult to accelerate smoothly.
  • Fuel economy can decrease significantly, often by 10-15%, as the vehicle may not operate efficiently due to transmission issues.
  • In severe cases, the vehicle may enter 'limp mode', restricting power and speed to protect the engine and transmission.

Possible Causes

Most common causes of P0855 (ordered by frequency):

  1. The most common cause of the P0855 code is a faulty transmission range sensor, which accounts for about 60% of cases. A defective sensor may fail to send accurate signals to the TCM.
  2. Another frequent cause is damaged wiring or poor connections in the sensor circuit. Corrosion or frayed wires can lead to intermittent faults, which can complicate diagnosis.
  3. In some cases, the problem may arise from a malfunctioning TCM or ECM. If these control modules do not process the sensor's input correctly, it can lead to miscommunication.
  4. Less common but serious causes include internal transmission issues, where mechanical failures within the transmission may affect sensor performance.
  5. A rare cause might be software glitches in the vehicle's computer system, which can sometimes be resolved with a simple software update.

P0855 Repair Costs

Cost Breakdown by Repair Type

Transmission Range Sensor Replacement

Replacing the faulty transmission range sensor with a new OEM part.

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

Repairing or replacing damaged wiring or connectors associated with the transmission range sensor.

  • Total: $100 - $250
  • Success rate: 75%
Money-Saving Tips for P0855
  • 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 P0855 Diagnosis Process

Follow these systematic steps to accurately diagnose P0855. 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

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context. This will help identify whether any other codes are present that could complicate 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 or specific diagnostic tools to test the transmission range sensor and wiring for proper voltage and resistance (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission range sensor and wiring 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 - After any repairs, verify proper operation of the transmission range sensor and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - After any repairs, verify proper operation of the transmission range sensor 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 the repair success and ensure the check engine light remains off (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the repair success and ensure 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 2008 Honda Accord

Vehicle: 2008 Honda Accord, 120,000 miles

Problem: Customer reported intermittent starting issues and check engine light.

Diagnosis: After scanning with GeekOBD APP, P0855 was confirmed. Wiring inspection revealed frayed wires leading to the sensor.

Solution: Replaced the transmission range sensor and repaired damaged wiring.

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

Result: The vehicle started without issues, and the check engine light remained off.

Case Study 2: Wiring Repair on 2010 Toyota Camry

Vehicle: 2010 Toyota Camry, 85,000 miles

Problem: Customer complained of harsh shifting and check engine light.

Diagnosis: Diagnostic testing showed P0855; visual inspection revealed corroded connectors.

Solution: Replaced the corroded connectors and verified wiring integrity.

Cost: $180 (connectors $80, labor $100)

Result: The shifting improved significantly, and the light was cleared.

Diagnose P0855

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: P0855
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes