P0977 - Transmission Fluid Pressure Sensor Range/Performance Problem (Common in 2014-2019 Ford F-150, 2016-2019 Honda Accord)

Quick Answer

P0977 means: P0977 refers to a transmission fluid pressure sensor range/performance issue.

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

Can I drive with P0977? Immediate attention is recommended to prevent transmission damage.

Common Questions

What does P0977 mean and how does it affect my car?

The P0977 code indicates a transmission fluid pressure sensor issue, which can lead to harsh shifts, slipping gears, and poor fuel economy. It's crucial to address this code quickly to maintain your vehicle's performance and avoid costly repairs.

What are the most common causes of P0977 and how much does it cost to fix?

Common causes include a faulty fluid pressure sensor, wiring issues, or low transmission fluid. Repairing the sensor can cost between $150 and $300, while wiring repairs or fluid changes may range from $100 to $200.

Can I drive my car with P0977 or should I stop immediately?

While you may be able to drive short distances, it's advisable to stop and address the issue promptly. Ignoring the P0977 code can lead to severe transmission damage and unsafe driving conditions.

How can I diagnose P0977 myself using GeekOBD APP?

You can use the GeekOBD APP to scan for codes, view freeze frame data, and monitor live sensor readings. This will help you understand if the fluid pressure sensor is working correctly or if there are other underlying issues.

What vehicles are most commonly affected by P0977?

This code frequently appears in vehicles like the 2014-2019 Ford F-150 and 2016-2019 Honda Accord. Regular maintenance can help mitigate issues related to this code.

How can I prevent P0977 from happening again?

Regularly check and change your transmission fluid, inspect wiring and connections for damage, and maintain your vehicle according to the manufacturer's recommendations to prevent future occurrences of P0977.

What is P0977?

The diagnostic trouble code (DTC) P0977 indicates a problem with the transmission fluid pressure sensor or its circuit. Essentially, this code points to a situation where the transmission control module (TCM) is detecting an abnormal reading from the fluid pressure sensor, which is vital for proper transmission operation. The fluid pressure sensor monitors the hydraulic pressure within the transmission, providing critical data to the TCM for effective shifting and performance. When the readings are outside the expected range, it can lead to poor transmission performance, such as hard shifting, slipping gears, or even total transmission failure in severe cases. Vehicle owners experiencing this code may notice the check engine light illuminating on their dashboard, alongside various driving symptoms. Addressing this issue promptly is crucial, as neglecting it can lead to more extensive and costly repairs down the line. It’s common in vehicles with higher mileage, especially those that have not had regular transmission fluid changes. If you own a Ford F-150 from 2014 to 2019 or a Honda Accord from 2016 to 2019, being aware of this code and its implications can save you from further complications.

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

Symptoms

Common symptoms when P0977 is present:

  • Check engine light remains illuminated, indicating a fault in the transmission system.
  • Harsh or delayed shifting during acceleration, making the vehicle feel sluggish or unresponsive.
  • Transmission slipping, where the engine revs without a corresponding increase in speed, potentially leading to unsafe driving conditions.
  • Poor fuel economy, as the transmission may struggle to engage properly, affecting the engine's efficiency.
  • Unusual noises from the transmission, such as whining or grinding, indicating possible internal issues.

Possible Causes

Most common causes of P0977 (ordered by frequency):

  1. Faulty transmission fluid pressure sensor (40% likelihood) - This is the most common cause and can often be solved by replacing the sensor.
  2. Wiring issues or poor connections in the sensor circuit (30% likelihood) - Damaged or corroded wires can lead to incorrect readings. Regular inspections can help catch these issues early.
  3. Dirty or low transmission fluid (15% likelihood) - Insufficient fluid can cause erratic pressure readings. Routine fluid changes can prevent this.
  4. Internal transmission damage (10% likelihood) - Serious but less common; may require a complete transmission rebuild or replacement.
  5. Software issues in the TCM (5% likelihood) - Sometimes, a simple software update can resolve the issue.

P0977 Repair Costs

Cost Breakdown by Repair Type

Sensor Replacement

Replacing the faulty transmission fluid pressure sensor.

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

Repairing or replacing damaged wiring or connectors.

  • Total: $100 - $250
  • Success rate: 70%
Transmission Fluid Change

Changing the transmission fluid to improve performance.

  • Total: $100 - $200
  • Success rate: 60%
Money-Saving Tips for P0977
  • 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 P0977 Diagnosis Process

Follow these systematic steps to accurately diagnose P0977. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Look for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Look 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 gather context about the fault (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to gather context about the fault (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 check the voltage and ground at the transmission fluid pressure sensor (20-30 minutes)

Step 3: Component testing - Use a multimeter to check the voltage and ground at the transmission fluid pressure sensor (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: Fluid condition check - Inspect the transmission fluid for contamination or low levels, which can affect sensor performance (10-15 minutes)

Step 4: Fluid condition check - Inspect the transmission fluid for contamination or low levels, which can affect sensor performance (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: System function test - After repairs, verify proper operation of the transmission and clear codes (10-15 minutes)

Step 5: System function test - After repairs, verify proper operation of the transmission and clear codes (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 6: Step 6: Road test verification - Drive the vehicle under various conditions to confirm that the repairs are successful (15-20 minutes)

Step 6: Road test verification - Drive the vehicle under various conditions to confirm that the repairs are successful (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 Fluid Pressure Sensor Replacement in 2016 Honda Accord

Vehicle: 2016 Honda Accord, 80,000 miles

Problem: Customer reported harsh shifting and check engine light.

Diagnosis: Used the GeekOBD APP to retrieve DTCs and identified P0977. Inspected the pressure sensor and wiring.

Solution: Replaced the faulty transmission fluid pressure sensor and cleared the codes.

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

Result: Vehicle shifted smoothly post-repair, and no codes reappeared.

Case Study 2: Wiring Issue in 2017 Ford F-150

Vehicle: 2017 Ford F-150, 45,000 miles

Problem: Check engine light on with erratic transmission behavior.

Diagnosis: Scanned for codes and confirmed P0977. Inspected wiring and found corrosion.

Solution: Repaired the corroded wiring and reconnected the harness.

Cost: $180 (parts: $30 for wiring, labor: $150)

Result: Check engine light cleared, and transmission operated normally after the fix.

Diagnose P0977

Use GeekOBD APP for professional diagnosis!

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

Code: P0977
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes