P0984 - Transmission Fluid Pressure Sensor Range/Performance Problem in Honda, Nissan, and More

Quick Answer

P0984 means: P0984 indicates a problem with the transmission fluid pressure sensor, affecting shifting performance.

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

Can I drive with P0984? Immediate attention is recommended to avoid transmission damage.

Common Questions

What does P0984 mean and how does it affect my car?

The P0984 code signals a problem with your vehicle's transmission fluid pressure sensor. This can lead to erratic shifting, reduced power, and can ultimately affect the longevity of your transmission. If this code appears, it's crucial to address it promptly to avoid more severe transmission issues.

What are the most common causes of P0984 and how much does it cost to fix?

Common causes include a faulty transmission fluid pressure sensor, wiring issues, and low transmission fluid levels. Repair costs can vary widely, typically ranging from $100 to $300 depending on the necessary repairs.

Can I drive my car with P0984 or should I stop immediately?

Driving with the P0984 code is not advisable. While you may still be able to drive your vehicle, doing so could lead to more significant transmission problems and higher repair costs. It's best to have it diagnosed and fixed as soon as possible.

How can I diagnose P0984 myself using GeekOBD APP?

To diagnose P0984 using the GeekOBD APP, start by connecting the app to your vehicle's OBD2 port. Retrieve the diagnostic trouble codes and check the freeze frame data for any anomalies. Follow the app's guidance for component testing and possible fixes.

What vehicles are most commonly affected by P0984?

The P0984 code is often seen in vehicles like the 2015-2018 Honda Accord, 2013-2017 Nissan Altima, and several models from Ford and Toyota. If you're driving one of these cars, be particularly vigilant for transmission-related symptoms.

How can I prevent P0984 from happening again?

To prevent P0984 from recurring, ensure regular maintenance of your vehicle's transmission system, including fluid changes at recommended intervals. Regularly check for leaks and monitor transmission performance, addressing any issues promptly.

What is P0984?

The Diagnostic Trouble Code (DTC) P0984 indicates a performance issue with the transmission fluid pressure sensor. This code typically arises when the Engine Control Module (ECM) detects that the transmission fluid pressure sensor is providing readings outside the expected range. In simpler terms, the sensor may be reporting an abnormally high or low pressure, which can lead to improper shifting, reduced power, and even potential transmission failure if left unchecked. This problem is commonly seen in vehicles such as the 2015-2018 Honda Accord, 2013-2017 Nissan Altima, and various other models that utilize similar transmission systems. Drivers may notice symptoms like erratic shifting behavior, a decrease in fuel efficiency, or a persistent check engine light. If you encounter this code, it is essential to diagnose the issue promptly to prevent further damage to your vehicle's transmission system. Addressing the P0984 code not only improves drivability but also ensures that you maintain your car's longevity and performance.

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

Symptoms

Common symptoms when P0984 is present:

  • The check engine light stays on constantly, indicating a persistent issue that should not be ignored.
  • Engine hesitates during acceleration, causing a sluggish response when the gas pedal is pressed.
  • Fuel economy decreased by 10-15%, leading to additional costs at the gas pump due to inefficient engine operation.
  • Transmission may slip or feel erratic during shifting, resulting in jerky movements that can be uncomfortable for passengers.
  • Unusual noises such as grinding or whining sounds might occur when the vehicle is in gear, indicating potential mechanical problems.

Possible Causes

Most common causes of P0984 (ordered by frequency):

  1. Faulty transmission fluid pressure sensor (60% likelihood) - Over time, sensors can wear out or fail due to exposure to heat and vibration.
  2. Wiring issues or poor connections (20% likelihood) - Damaged or corroded wires can lead to inaccurate readings sent to the ECM.
  3. Low transmission fluid levels (10% likelihood) - Insufficient fluid can affect the sensor's ability to provide accurate pressure readings.
  4. Malfunctioning ECM (5% likelihood) - Although rare, a faulty ECM can misinterpret sensor signals, leading to erroneous codes.
  5. Internal transmission problems (5% likelihood) - Issues within the transmission itself, such as a damaged pump or valve body, can cause pressure discrepancies.

P0984 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 - $200
  • Success rate: 75%
Transmission Fluid Change

Changing transmission fluid if levels are low or contaminated.

  • Total: $80 - $150
  • Success rate: 70%
Money-Saving Tips for P0984
  • 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 P0984 Diagnosis Process

Follow these systematic steps to accurately diagnose P0984. 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 or specific diagnostic tools to test the transmission fluid pressure sensor (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test 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: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs 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 repair success and ensure normal operation (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure normal operation (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: 2016 Honda Accord P0984 Repair

Vehicle: 2016 Honda Accord, 70,000 miles

Problem: Customer reported erratic shifting and check engine light.

Diagnosis: After scanning with GeekOBD APP, the P0984 code was confirmed, and inspection revealed a faulty transmission fluid pressure sensor.

Solution: Replaced the sensor and cleared the code; performed a fluid change as a precaution.

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

Result: Post-repair, the vehicle shifted smoothly, and the check engine light remained off.

Case Study 2: 2014 Nissan Altima Wiring Repair

Vehicle: 2014 Nissan Altima, 85,000 miles

Problem: Customer experienced poor acceleration and check engine light illuminated.

Diagnosis: Diagnostic scan revealed P0984; wiring inspection showed corroded connections.

Solution: Repaired the wiring and connectors, then cleared codes.

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

Result: The vehicle returned to normal operation, with no further issues reported.

Diagnose P0984

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: P0984
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes