P0797 - Transmission Range Sensor Performance Problem in Common Vehicles like Honda Accord and Toyota Camry

Quick Answer

P0797 means: P0797 indicates a transmission range sensor performance issue.

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

Can I drive with P0797? Immediate attention is recommended to prevent further transmission damage.

Common Questions

What does P0797 mean and how does it affect my car?

P0797 indicates a problem with the transmission range sensor, which could lead to erratic shifting and performance issues. If ignored, this could result in more severe transmission damage and costly repairs down the road.

What are the most common causes of P0797 and how much does it cost to fix?

Common causes include a faulty transmission range sensor, wiring issues, or low transmission fluid. Repair costs can range from $100 to $300 depending on the specific issue and parts needed.

Can I drive my car with P0797 or should I stop immediately?

It's advisable to avoid driving your vehicle with this code, as it can lead to further transmission damage. Immediate diagnostic and repair is recommended.

How can I diagnose P0797 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform an OBD2 scan to retrieve the P0797 code and any associated codes. This will help you understand the context of the problem and assist in further diagnostics.

What vehicles are most commonly affected by P0797?

P0797 is commonly seen in vehicles like the 2013-2017 Honda Accord and the 2012-2016 Toyota Camry. Always check for any recalls or technical service bulletins related to these models.

How can I prevent P0797 from happening again?

Regular maintenance, including checking transmission fluid levels and ensuring wiring is intact, can help prevent P0797. Additionally, using quality parts during repairs can enhance reliability.

What is P0797?

The diagnostic trouble code P0797 signifies a performance issue with the transmission range sensor or switch. This component is crucial for relaying the vehicle's current gear selection to the Engine Control Module (ECM). When the ECM detects a discrepancy between the expected and actual gear position, it triggers the P0797 code. This can lead to various performance issues, such as erratic shifting, inability to shift into certain gears, or even the vehicle remaining in limp mode. Common in vehicles like the 2013-2017 Honda Accord and the 2012-2016 Toyota Camry, this issue can stem from a faulty sensor, wiring problems, or even issues within the transmission itself. It's vital that this code is addressed promptly, as driving with it could lead to further transmission damage and costly repairs. Understanding what P0797 means can help you take the necessary steps to diagnose and remedy the problem effectively, ensuring your vehicle operates smoothly and safely.

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

Symptoms

Common symptoms when P0797 is present:

  • The check engine light illuminates and stays on, indicating a need for diagnostics.
  • Drivers may experience harsh or erratic shifting, making it difficult to change gears smoothly.
  • Fuel economy may decrease significantly, often by 10-15%, due to improper gear engagement.
  • The vehicle may hesitate or stall during acceleration, especially when shifting from park to drive.
  • In some cases, the vehicle may enter limp mode, limiting speed and performance.

Possible Causes

Most common causes of P0797 (ordered by frequency):

  1. The most common cause is a faulty transmission range sensor, occurring in about 60% of cases. This sensor can wear out over time, leading to inaccurate readings.
  2. Another prevalent cause is wiring issues, such as frayed wires or poor connections, which can disrupt the electrical signal to the ECM.
  3. In some instances, the transmission fluid may be low or contaminated, leading to erratic sensor readings. Regular fluid checks could prevent this issue.
  4. Less common, but serious, is internal transmission damage, which could be due to wear and tear or lack of maintenance.
  5. A rare but possible cause is a failing ECM, which may misinterpret signals from the range sensor.

P0797 Repair Costs

Cost Breakdown by Repair Type

Sensor Replacement

Replacing the faulty transmission range sensor to restore proper gear signal.

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

Repairing or replacing damaged wiring to ensure proper electrical connection.

  • Total: $100 - $250
  • Success rate: 75%
Transmission Fluid Change

Changing the transmission fluid if contamination is suspected.

  • Total: $80 - $150
  • Success rate: 70%
Money-Saving Tips for P0797
  • 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 P0797 Diagnosis Process

Follow these systematic steps to accurately diagnose P0797. 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 voltage at the transmission range sensor (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the voltage at the transmission range 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 (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (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 2014 Honda Accord

Vehicle: 2014 Honda Accord, 85,000 miles

Problem: Customer reported the check engine light was on and the vehicle was experiencing harsh shifting.

Diagnosis: After a diagnostic scan with GeekOBD APP, P0797 was confirmed. Visual inspection revealed a faulty transmission range sensor.

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

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

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

Case Study 2: Wiring Repair on 2015 Toyota Camry

Vehicle: 2015 Toyota Camry, 60,000 miles

Problem: Customer complained of stalling and erratic shifts.

Diagnosis: Diagnostic scan revealed P0797. Further inspection showed damaged wiring near the transmission.

Solution: Repaired the damaged wiring and tested the sensor functionality.

Cost: $200 (parts: $50 for wiring, $150 for labor)

Result: The vehicle performed well after the repair, with no further issues reported.

Diagnose P0797

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: P0797
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes