P0845 - Transmission Fluid Pressure Sensor Range/Performance Problem in Honda and Toyota Models

Quick Answer

P0845 means: P0845 means there's a problem with the transmission fluid pressure sensor circuit.

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

Can I drive with P0845? Immediate attention is recommended to prevent further transmission damage.

Common Questions

What does P0845 mean and how does it affect my car?

The P0845 code signifies a malfunction within the transmission fluid pressure sensor circuit. This issue can lead to poor transmission performance, including slipping gears and harsh shifting, significantly impacting your vehicle's drivability and fuel efficiency.

What are the most common causes of P0845 and how much does it cost to fix?

Common causes for the P0845 code include a faulty transmission fluid pressure sensor, wiring issues, or low transmission fluid levels. Repair costs can range from $90 for a fluid change to $300 for a sensor replacement.

Can I drive my car with P0845 or should I stop immediately?

While you may be able to drive your car, it's highly recommended to address the P0845 code as soon as possible. Continuing to drive can lead to more significant transmission damage, resulting in much higher repair costs.

How can I diagnose P0845 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for DTCs, view freeze frame data, and monitor live sensor readings. This can help you determine whether the transmission fluid pressure sensor is functioning within the expected range.

What vehicles are most commonly affected by P0845?

The P0845 code is frequently seen in models such as the 2005-2015 Honda Accord and the 2007-2012 Toyota Camry. These models may have known issues with the transmission fluid pressure sensor.

How can I prevent P0845 from happening again?

Regular maintenance, including timely transmission fluid changes and inspections of wiring and connectors, can help prevent the P0845 code from reappearing. Using quality fluids and ensuring proper installation of components during repairs is also essential.

What is P0845?

The DTC code P0845 indicates a problem with the transmission fluid pressure sensor circuit range or performance. This code is particularly common in various models from manufacturers like Honda and Toyota, especially the 2005-2015 Honda Accord and the 2007-2012 Toyota Camry. The transmission fluid pressure sensor is crucial as it monitors the hydraulic pressure within the transmission and sends this information to the vehicle's engine control module (ECM). When the ECM detects that the pressure sensor is outside its normal operating range, it triggers the P0845 code. This can lead to several performance issues, including erratic shifting, slipping gears, and even complete transmission failure if not addressed promptly. Drivers may experience a check engine light, along with possible decrease in fuel efficiency, and difficulties during gear changes. Over time, neglecting this issue can result in costly repairs, so it's essential to diagnose and rectify any problems associated with this code as soon as they arise.

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

Symptoms

Common symptoms when P0845 is present:

  • Check engine light stays on constantly, indicating a persistent issue with the transmission fluid pressure.
  • Transmission may hesitate during acceleration, causing a noticeable delay or jerk when shifting gears.
  • Fuel economy decreased by 10-15%, which can significantly impact your wallet over time.
  • Transmission slipping may occur, where the engine revs without an increase in vehicle speed, indicating a lack of proper fluid pressure.
  • Unusual noises from the transmission, such as whining or grinding, which can signify a more serious problem.

Possible Causes

Most common causes of P0845 (ordered by frequency):

  1. Faulty transmission fluid pressure sensor (60% likelihood) - Often, the sensor itself is the culprit, either due to wear or manufacturing defects.
  2. Wiring issues (20% likelihood) - Damaged or corroded wiring can disrupt the signal between the sensor and the ECM.
  3. Transmission fluid level is low (15% likelihood) - Insufficient fluid can lead to incorrect pressure readings and performance problems.
  4. Faulty ECM (3% likelihood) - In rare cases, the engine control module may not properly interpret the sensor’s readings.
  5. Mechanical transmission issues (2% likelihood) - Such as a damaged pump or internal component failures that disrupt normal function.

P0845 Repair Costs

Cost Breakdown by Repair Type

Sensor Replacement

Replacing the faulty transmission fluid pressure sensor with a new OEM part.

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

Repairing corroded or damaged wiring related to the sensor circuit.

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

Changing the transmission fluid if it is low or contaminated.

  • Total: $90 - $150
  • Success rate: 70%
Money-Saving Tips for P0845
  • 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 P0845 Diagnosis Process

Follow these systematic steps to accurately diagnose P0845. 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 output of the transmission fluid pressure sensor (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the voltage output of 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 level check - Inspect the transmission fluid level and condition; low or dirty fluid can cause issues (10-15 minutes)

Step 4: Fluid level check - Inspect the transmission fluid level and condition; low or dirty fluid can cause issues (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 and clear codes to ensure no reoccurrence (10-15 minutes)

Step 5: System function test - After repairs, verify proper operation and clear codes to ensure no reoccurrence (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 repair success (15-20 minutes)

Step 6: 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 Fluid Pressure Sensor Replacement in a 2010 Honda Accord

Vehicle: 2010 Honda Accord, 85,000 miles

Problem: Customer reported the check engine light was on and experienced rough shifting.

Diagnosis: After retrieving the P0845 code and inspecting the vehicle, the transmission fluid pressure sensor was found faulty.

Solution: Replaced the transmission fluid pressure sensor and changed the transmission fluid.

Cost: $275 (sensor $200, fluid $75)

Result: The vehicle's performance improved significantly, and the check engine light was cleared.

Case Study 2: Wiring Repair for P0845 in a 2012 Toyota Camry

Vehicle: 2012 Toyota Camry, 60,000 miles

Problem: Customer noticed slipping gears and a check engine light.

Diagnosis: Diagnostic tests pointed to P0845, revealing damaged wiring connected to the pressure sensor.

Solution: Repaired the wiring harness, ensuring solid connections and integrity.

Cost: $150 (wiring repair)

Result: The slipping stopped, and the vehicle operated smoothly after the repair.

Diagnose P0845

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0845
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes