P0942 - Transmission Fluid Pressure Sensor Circuit Range/Performance Problem in Popular Vehicles like Honda Accord and Toyota Camry

Quick Answer

P0942 means: P0942 indicates a transmission fluid pressure sensor circuit problem.

Fix: Check and replace faulty components Cost: $150 - $250 Time: 90-180 minutes

Can I drive with P0942? Immediate attention is recommended to avoid transmission damage.

Common Questions

What does P0942 mean and how does it affect my car?

The P0942 code indicates a problem with the transmission fluid pressure sensor circuit. It can lead to poor transmission performance, erratic shifting, and may even cause the transmission to fail if not addressed promptly. This can affect your vehicle's drivability and safety.

What are the most common causes of P0942 and how much does it cost to fix?

Common causes of P0942 include a faulty transmission fluid pressure sensor, wiring issues, and low transmission fluid levels. Repair costs can range from $80 to $250 depending on the specific issue and required repairs.

Can I drive my car with P0942 or should I stop immediately?

While you might be able to drive short distances, it is strongly advised to address the P0942 code as soon as possible. Continuing to drive could lead to more severe transmission damage and costly repairs.

How can I diagnose P0942 myself using GeekOBD APP?

Using the GeekOBD APP, scan your vehicle to retrieve DTCs and identify P0942. Review freeze frame data to understand when the code was triggered. Follow up with visual inspections and sensor testing as suggested in the app.

What vehicles are most commonly affected by P0942?

Vehicles like the 2015-2018 Honda Accord, 2016-2020 Toyota Camry, and Ford F-150 models from 2015-2019 are commonly affected by P0942. Always check for recalls or technical service bulletins related to this issue.

How can I prevent P0942 from happening again?

Regular maintenance is key. Ensure routine checks on transmission fluid levels and quality, inspect wiring for wear and tear, and replace the transmission fluid as per your vehicle’s service intervals to prevent future occurrences of P0942.

What is P0942?

The diagnostic trouble code (DTC) P0942 indicates a problem with the transmission fluid pressure sensor circuit performance. This code is triggered when the powertrain control module (PCM) detects that the voltage from the transmission fluid pressure sensor does not fall within the expected range. More specifically, the sensor monitors the pressure of the transmission fluid and relays this information to the PCM to ensure optimal shifting and performance. If the PCM finds that the voltage is too high or too low, it triggers the P0942 code. Common symptoms include erratic shifting, slipping of the transmission, and the check engine light illuminating. Ignoring this code can lead to severe transmission issues, including complete transmission failure, which can be costly to repair. It's crucial for vehicle owners, especially those of models like the 2015-2018 Honda Accord, the 2016-2020 Toyota Camry, and various Ford models, to address this issue promptly to maintain their vehicle's performance and safety.

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

Symptoms

Common symptoms when P0942 is present:

  • Check engine light stays on constantly, indicating an underlying issue that needs addressing.
  • Erratic shifting or harsh engagement when changing gears, which can lead to a rough driving experience.
  • Transmission slipping during acceleration, where the engine revs but the vehicle fails to increase speed appropriately.
  • Decreased fuel economy, potentially due to the transmission not operating efficiently, leading to increased strain on the engine.
  • Unusual noises from the transmission, such as whining or grinding, which could indicate internal issues.

Possible Causes

Most common causes of P0942 (ordered by frequency):

  1. Faulty transmission fluid pressure sensor (60% likelihood): This is the most common cause of the P0942 code. If the sensor fails, it won't send correct signals to the PCM, leading to performance problems.
  2. Wiring issues (25% likelihood): Damaged wiring or poor connections in the sensor circuit can cause incorrect readings. Inspecting the harness and connector for wear or corrosion is crucial.
  3. Low transmission fluid levels (10% likelihood): Insufficient fluid can lead to incorrect pressure readings. Regularly check fluid levels and top off as necessary to prevent issues.
  4. Faulty PCM (3% likelihood): Although rare, a malfunctioning PCM can misinterpret sensor data. A thorough diagnostic process is necessary to confirm this.
  5. Mechanical transmission issues (2% likelihood): Problems such as worn clutches or damaged gears can affect overall transmission pressure and may need professional evaluation.

P0942 Repair Costs

Cost Breakdown by Repair Type

Sensor Replacement

Replacing the faulty transmission fluid pressure sensor is often the first step in resolving P0942.

  • Total: $150 - $250
  • Success rate: 85%
Wiring Repair

If wiring is damaged, repairing or replacing the wiring harness can resolve the issue.

  • Total: $100 - $200
  • Success rate: 75%
Transmission Fluid Change

If low transmission fluid is the issue, a fluid change may be necessary.

  • Total: $80 - $150
  • Success rate: 60%
Money-Saving Tips for P0942
  • 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 P0942 Diagnosis Process

Follow these systematic steps to accurately diagnose P0942. 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 to ensure all components are intact (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion to ensure all components are intact (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 using the GeekOBD APP - Retrieve all DTCs and freeze frame data to understand the fault context and check for related codes (10-15 minutes)

Step 2: OBD2 scan using the GeekOBD APP - Retrieve all DTCs and freeze frame data to understand the fault context and check for related 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 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission fluid pressure sensor and its circuit for continuity and proper voltage (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission fluid pressure sensor and its circuit 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 - After any repairs, verify proper operation of the transmission system and clear the codes to see if they return (10-15 minutes)

Step 4: System function test - After any repairs, verify proper operation of the transmission system and clear the codes to see if they return (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 the problem has been resolved and ensure the transmission operates smoothly (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the problem has been resolved and ensure the transmission operates smoothly (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 on 2016 Honda Accord

Vehicle: 2016 Honda Accord, 75,000 miles

Problem: Customer reported check engine light illuminated and rough shifting.

Diagnosis: Scanned for codes using the GeekOBD APP, confirmed P0942. Visual inspection showed corroded wiring.

Solution: Replaced the transmission fluid pressure sensor and repaired the wiring harness.

Cost: $230 (parts: $150 for sensor, $80 for labor)

Result: Customer reported improved shifting performance and no check engine light after repair.

Case Study 2: Wiring Repair for P0942 in a 2018 Toyota Camry

Vehicle: 2018 Toyota Camry, 50,000 miles

Problem: Driver experienced slipping transmission and check engine light.

Diagnosis: OBD2 scan revealed P0942. Wiring inspection showed damaged insulation causing shorts.

Solution: Repaired damaged wiring and cleared codes.

Cost: $120 (parts: $20 for wiring, $100 for labor)

Result: After repair, the vehicle performed smoothly, and the check engine light remained off.

Diagnose P0942

Use GeekOBD APP for professional diagnosis!

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

Code: P0942
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes