P085A - Understanding Transmission Range Sensor Performance Issue in 2016-2020 Ford Focus and Other Models

Quick Answer

P085A means: P085A signifies a fault in the transmission range sensor performance.

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

Can I drive with P085A? Address this issue immediately to prevent potential transmission damage.

Common Questions

What does P085A mean and how does it affect my car?

The P085A code indicates that your vehicle's transmission range sensor is malfunctioning, which can prevent your car from starting or cause erratic shifting. This could lead to unsafe driving conditions if not addressed.

What are the most common causes of P085A and how much does it cost to fix?

Common causes include a faulty transmission range sensor, damaged wiring, or even ECM issues. Repair costs can range from $150 for sensor replacement to $800 or more if the ECM needs replacing.

Can I drive my car with P085A or should I stop immediately?

It's best to stop driving if you see this code, as it can lead to stalling and unsafe driving conditions. Addressing the issue promptly is essential for your safety.

How can I diagnose P085A myself using GeekOBD APP?

Using the GeekOBD APP, connect it to your vehicle's OBD2 port, retrieve the P085A code, and view freeze frame data for context. This will help you understand when and why the code appears.

What vehicles are most commonly affected by P085A?

The P085A code is often seen in 2016-2020 Ford Focus models, as well as certain Chrysler vehicles. Always check for any recalls or technical service bulletins related to your specific model.

How can I prevent P085A from happening again?

Regular maintenance is key. Ensure your transmission fluid levels are correct, inspect wiring regularly, and replace worn components to prevent recurrence of the P085A code.

What is P085A?

The P085A diagnostic trouble code (DTC) indicates a problem with the transmission range sensor circuit performance. The transmission range sensor, also known as the neutral safety switch, is crucial for determining the gear position of your vehicle's transmission. When this sensor detects that the vehicle is not in the correct gear for starting, it sends a signal to the engine control module (ECM) to prevent the engine from starting. The P085A code is triggered when the ECM detects that the signal from the transmission range sensor is outside of the expected range. This issue can lead to symptoms like difficulty starting the vehicle, erratic shifting, or even stalling while driving. In everyday terms, if you see this code, it's like your car not being able to tell whether it's in park or drive, causing confusion in its operation. Ignoring this code can lead to further complications, including potential transmission damage, as the vehicle may not shift correctly or could inadvertently shift into neutral while in motion. Commonly found in vehicles such as the 2016-2020 Ford Focus and various Chrysler models, it's essential to address the P085A code promptly to ensure safe and reliable vehicle operation.

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

Symptoms

Common symptoms when P085A is present:

  • The 'Check Engine' light activates, staying on or flashing, indicating a fault that needs attention.
  • You may experience difficulty starting the vehicle, with the engine cranking but not starting, especially if the gear is not accurately detected.
  • The vehicle may hesitate or jerk during acceleration, leading to an uncomfortable driving experience as it struggles to shift properly.
  • You might notice erratic shifting patterns where the transmission shifts unusually or unexpectedly, affecting overall driving performance.
  • In some cases, the vehicle may stall unexpectedly while driving, which can be dangerous if it occurs in traffic.

Possible Causes

Most common causes of P085A (ordered by frequency):

  1. The most common cause of the P085A code is a faulty transmission range sensor, accounting for about 60% of cases. This sensor can wear out or malfunction due to electrical issues.
  2. Another significant cause could be damaged wiring or poor connections in the sensor circuit. This can lead to signal loss, affecting the sensor's ability to communicate with the ECM.
  3. Preventive maintenance is crucial; regularly checking and ensuring that the transmission fluid is at the correct level can help avoid sensor issues.
  4. A less common but serious cause could be internal transmission problems, such as worn gears or clutches, which can also trigger this code and lead to more extensive repairs.
  5. In rare cases, a malfunctioning ECM can cause the P085A code due to incorrect interpretations of the sensor signals, necessitating further diagnostic checks.

P085A Repair Costs

Cost Breakdown by Repair Type

Transmission Range Sensor Replacement

Replacing the faulty transmission range sensor is the most straightforward solution.

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

Repairing damaged wiring or connections in the sensor circuit may be necessary.

  • Total: $50 - $200
  • Success rate: 80%
ECM Replacement

In cases where the ECM is faulty, it may need to be replaced or reprogrammed.

  • Total: $800 - $1500
  • Success rate: 75%
Money-Saving Tips for P085A
  • 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 P085A Diagnosis Process

Follow these systematic steps to accurately diagnose P085A. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection of the transmission range sensor and wiring for any obvious signs of damage, loose connections, or corrosion (5-10 minutes)

Step 1: Conduct an initial visual inspection of the transmission range sensor and wiring for any obvious signs of damage, 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: Use a diagnostic scanner, like the GeekOBD APP, to retrieve the P085A code and any related codes, along with freeze frame data to understand the fault context (10-15 minutes)

Step 2: Use a diagnostic scanner, like the GeekOBD APP, to retrieve the P085A code and any related codes, along with 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: Perform component testing using a multimeter to check the voltage and resistance of the transmission range sensor and verify if it meets manufacturer specifications (20-30 minutes)

Step 3: Perform component testing using a multimeter to check the voltage and resistance of the transmission range sensor and verify if it meets manufacturer specifications (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: After making any necessary repairs, conduct a system function test to ensure the sensor operates correctly and clear any codes from the ECM (10-15 minutes)

Step 4: After making any necessary repairs, conduct a system function test to ensure the sensor operates correctly and clear any codes from the ECM (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 the vehicle under various driving conditions to ensure the issue is resolved and that the vehicle shifts correctly without any fault codes reappearing (15-20 minutes)

Step 5: Road test the vehicle under various driving conditions to ensure the issue is resolved and that the vehicle shifts correctly without any fault codes reappearing (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 in a 2018 Ford Focus

Vehicle: 2018 Ford Focus, 45,000 miles

Problem: Customer reported difficulty starting the vehicle and erratic shifting.

Diagnosis: Diagnostics revealed a P085A code indicating a faulty transmission range sensor.

Solution: Replaced the transmission range sensor and cleared the codes.

Cost: $220 (sensor cost + labor)

Result: Customer reported no further issues and smooth operation after the repair.

Case Study 2: Wiring Repair for a 2017 Chrysler 200

Vehicle: 2017 Chrysler 200, 30,000 miles

Problem: Customer experienced stalling and 'Check Engine' light activation.

Diagnosis: Found damaged wiring in the transmission range sensor circuit, triggering the P085A code.

Solution: Repaired the wiring and reconnected the sensor.

Cost: $120 (repair cost + labor)

Result: Vehicle operated normally post-repair with no recurring codes.

Diagnose P085A

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: P085A
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes