P0840 Infiniti Code - Transmission Fluid Pressure Sensor 'A'
Quick Answer
The P0840 code in an Infiniti indicates a problem with the Transmission Fluid Pressure Sensor 'A'. Common causes include Faulty transmission fluid pressure sensor, Wiring or connector issues, Low transmission fluid levels. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0840 Infiniti indicates Transmission Fluid Pressure Sensor 'A'.
- Common causes
- Common causes include Faulty transmission fluid pressure sensor, Wiring or connector issues, Low transmission fluid levels.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0840 Infiniti Description
The P0840 code in an Infiniti indicates a problem with the Transmission Fluid Pressure Sensor 'A'. This sensor is responsible for monitoring the hydraulic pressure within the transmission system and sending this information to the vehicle's engine control module (ECM). The ECM uses this data to ensure that the transmission shifts smoothly and efficiently. When the sensor detects an abnormal pressure reading, it triggers the P0840 code, indicating a potential issue that needs to be addressed.
Common Causes of P0840 Infiniti
- Faulty transmission fluid pressure sensor
- Wiring or connector issues
- Low transmission fluid levels
- Malfunctioning transmission pump
- Clogged transmission filter
Symptoms of P0840 Infiniti
- Harsh or delayed shifting
- Erratic transmission behavior
- Slipping gears
- Transmission overheating
- Transmission warning light illuminated on the dashboard
How to Fix P0840 Infiniti
- Begin by conducting a thorough inspection of the transmission fluid pressure sensor, wiring, and connectors. Replace any damaged components as needed.
- Check the transmission fluid level and quality. Top up or replace the fluid if it is low or contaminated.
- Test the transmission pump's functionality and replace it if necessary.
- Clear the code from the vehicle's ECM using a diagnostic scanner and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P0840 Infiniti
The typical repair cost for addressing the P0840 code in an Infiniti can range from $200 to $500. This estimate includes the cost of parts such as a new transmission fluid pressure sensor, transmission fluid, and potentially a new transmission pump, as well as labor costs. It is important to note that actual repair costs can vary depending on the specific diagnosis and the labor rates at the auto repair shop. It is advisable to obtain quotes from multiple shops and compare prices before proceeding with the repair.
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