Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with a sensor that checks the pressure of the transmission fluid. It's like a thermometer for the car's transmission, and it's not working right.
The transmission fluid pressure sensor/switch B circuit monitors the pressure of the transmission fluid to ensure proper transmission operation. If the sensor or circuit fails, it can cause shifting issues.
The P0845 code is set when the Powertrain Control Module (PCM) detects an abnormal voltage reading from the transmission fluid pressure sensor/switch B. This sensor is responsible for monitoring the hydraulic pressure within the transmission, which is crucial for controlling gear shifts and ensuring smooth operation.
• Check Engine Light is on
• Transmission slipping or harsh shifting
• Poor fuel economy
• Faulty transmission fluid pressure sensor
• Damaged or corroded wiring/connectors
• Transmission fluid issues (low or dirty fluid)
PCM: Powertrain Control Module
Transmission Fluid: A liquid used to lubricate and cool the components of a vehicle's transmission
• Use an OBD-II scanner to confirm the code.
• Inspect the transmission fluid level and condition.
• Check the wiring and connectors for damage or corrosion.
• Replace the faulty transmission fluid pressure sensor.
• Repair or replace damaged wiring/connectors.
• Perform a transmission fluid flush and refill.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Honda Accord
• Nissan Altima
• Toyota Camry
• Regular transmission fluid checks and changes
• Routine inspection of transmission wiring and connectors
• Avoid aggressive driving habits
Sensor Issue
• Avoid driving the vehicle until the issue is fixed to prevent further damage.
• Consult a professional mechanic for an accurate diagnosis.
Check with your vehicle manufacturer for specific warranty coverage related to the transmission system.
This code has been associated with transmission shifting issues in several vehicle models, often due to sensor or wiring failures.
Moderate – While the vehicle may still be drivable, it could lead to further transmission damage if not addressed promptly.
Driving with transmission issues can be unsafe and may lead to further vehicle damage. Address the issue as soon as possible.
• Vehicle at operating temperature
• Transmission fluid at correct level
The transmission fluid pressure sensor is typically located on or inside the transmission housing.
Q: Can I drive with a P0845 code?
A: It's not recommended to drive with this code as it can cause further transmission damage.
Q: How do I reset the P0845 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, the code should not return.
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