P0955 - Transmission Range Sensor Circuit Malfunction in 2010-2015 Ford Focus and Other Models

Quick Answer

P0955 means: P0955 denotes a malfunction in the transmission range sensor circuit.

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

Can I drive with P0955? Immediate attention is recommended to prevent transmission damage.

Common Questions

What does P0955 mean and how does it affect my car?

The P0955 code signifies a problem with the transmission range sensor circuit. This can cause issues with shifting gears, leading to potential transmission failure if left unaddressed. Drivers may notice poor acceleration, erratic shifting, and a decrease in fuel efficiency.

What are the most common causes of P0955 and how much does it cost to fix?

Common causes include a faulty transmission range sensor, wiring issues, or PCM faults. Repair costs can range from $150 for a sensor replacement to $300 for more extensive wiring repairs.

Can I drive my car with P0955 or should I stop immediately?

It is advised to stop driving the vehicle immediately if the P0955 code appears. Continuing to drive can lead to further transmission damage, potentially resulting in costly repairs.

How can I diagnose P0955 myself using GeekOBD APP?

Using the GeekOBD APP, scan for trouble codes and review the freeze frame data. This will help you understand the vehicle's performance at the time the code was triggered. Focus on the transmission range sensor readings and check for any extreme variations.

What vehicles are most commonly affected by P0955?

Vehicles commonly affected include the 2010-2015 Ford Focus, 2011-2015 Ford Fiesta, and some models of Mazda and Lincoln that share similar transmission systems.

How can I prevent P0955 from happening again?

Regularly check and maintain your vehicle’s transmission fluid levels, perform routine inspections of wiring and connectors, and address any issues promptly to avoid future occurrences of P0955.

What is P0955?

DTC P0955 indicates a problem with the transmission range sensor circuit, which is crucial for determining the gear position in automatic transmissions. This code can trigger when the powertrain control module (PCM) detects an inconsistency in the signals from the transmission range sensor. When the transmission range sensor fails, it can lead to various issues such as improper shifting, difficulty in engaging gears, or a complete loss of transmission function. Drivers may experience symptoms like a check engine light, erratic shifting patterns, or the vehicle getting stuck in a single gear. This code is commonly seen in vehicles like the 2010-2015 Ford Focus, 2011-2015 Ford Fiesta, and other models equipped with similar automatic transmissions. Ignoring this code could lead to more severe transmission damage and costly repairs, making it essential to diagnose and address the issue promptly.

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

Symptoms

Common symptoms when P0955 is present:

  • Check engine light stays on constantly, indicating a persistent issue with the transmission range sensor.
  • Engine hesitates during acceleration or struggles to shift smoothly, leading to a frustrating driving experience.
  • Fuel economy decreased by 10-15%, as the vehicle may not shift correctly, causing the engine to work harder.
  • Transmission may slip or refuse to shift into higher gears, which can lead to reduced power and increased wear.
  • Unusual transmission noises, such as grinding or clunking sounds, especially when the vehicle is shifting gears.

Possible Causes

Most common causes of P0955 (ordered by frequency):

  1. Faulty transmission range sensor is the most common cause, occurring in about 60% of cases. This sensor can wear out or become damaged over time due to exposure to heat and vibrations.
  2. Wiring issues, such as damaged or corroded wires and connectors, may account for 25% of cases. These problems can disrupt the signal to the PCM, leading to false readings.
  3. A malfunctioning PCM can be a less common but serious cause, accounting for about 10% of cases. The PCM itself may misinterpret sensor data, resulting in erroneous codes.
  4. Fluid leaks in the transmission system can lead to low transmission fluid levels, which may affect sensor readings and operation.
  5. Mechanical failure inside the transmission can result in incorrect sensor signals, though this is rare and typically signals severe issues.

P0955 Repair Costs

Cost Breakdown by Repair Type

Transmission Range Sensor Replacement

Replacing the faulty transmission range sensor with an OEM or aftermarket part.

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

Repairing or replacing damaged wiring and connectors related to the transmission range sensor.

  • Total: $100 - $200
  • Success rate: 75%
Money-Saving Tips for P0955
  • 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 P0955 Diagnosis Process

Follow these systematic steps to accurately diagnose P0955. 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 range sensor and its wiring for continuity and proper voltage (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the transmission range sensor and its wiring for continuity and proper voltage (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 to ensure the issue is resolved (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes to ensure the issue is resolved (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 repair success and monitor for any reoccurrence of the code (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor for any reoccurrence of the code (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 2013 Ford Focus

Vehicle: 2013 Ford Focus, 85,000 miles

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

Diagnosis: Using the GeekOBD APP, the P0955 code was retrieved along with freeze frame data showing incorrect gear position readings.

Solution: Replaced the faulty transmission range sensor and performed a fluid change.

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

Result: Post-repair, the vehicle shifted smoothly with no further check engine light.

Case Study 2: Wiring Repair for P0955 in 2014 Ford Fiesta

Vehicle: 2014 Ford Fiesta, 60,000 miles

Problem: Driver experienced difficulty shifting gears and noted a check engine light.

Diagnosis: Visual inspection revealed frayed wiring near the transmission range sensor.

Solution: Repaired the damaged wiring and secured connections.

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

Result: After repairs, the vehicle operated normally with no further issues.

Diagnose P0955

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: P0955
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes