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Engine-Codes – Generic – P0879

P0879 Code - Transmission Fluid Pressure Sensor/Switch 'D' Circuit Intermittent

Quick Answer

The P0879 diagnostic trouble code refers to a Transmission Fluid Pressure Sensor/Switch 'D' Circuit Intermittent issue. Common causes include Faulty transmission fluid pressure sensor/switch, Wiring or electrical issues such as a short or open circuit, Malfunctioning transmission control module (TCM). 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
P0879 indicates Transmission Fluid Pressure Sensor/Switch 'D' Circuit Intermittent.
Common causes
Common causes include Faulty transmission fluid pressure sensor/switch, Wiring or electrical issues such as a short or open circuit, Malfunctioning transmission control module (TCM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0879 Description

The P0879 diagnostic trouble code refers to a Transmission Fluid Pressure Sensor/Switch 'D' Circuit Intermittent issue. In automatic transmissions, the transmission fluid pressure sensor is responsible for monitoring and regulating the fluid pressure within the transmission system. This sensor plays a crucial role in ensuring smooth gear shifts and optimal transmission performance.

OBDII Code P0879 - Transmission Fluid Pressure Sensor/Switch 'D' Circuit Intermittent
P0879 Code - Transmission Fluid Pressure Sensor/Switch 'D' Circuit Intermittent

Common Causes of P0879

  1. Faulty transmission fluid pressure sensor/switch
  2. Wiring or electrical issues such as a short or open circuit
  3. Malfunctioning transmission control module (TCM)
  4. Low or contaminated transmission fluid
  5. Mechanical issues within the transmission system

Symptoms of P0879

  1. Rough or harsh shifting between gears
  2. Delayed engagement when shifting from park to drive or reverse
  3. Transmission slipping or jerking during acceleration
  4. Illumination of the check engine light
  5. Transmission may go into limp mode to protect itself from further damage

How to Fix P0879

  1. Use a diagnostic scan tool to retrieve the trouble code and identify the specific issue with the Transmission Fluid Pressure Sensor/Switch 'D' circuit.
  2. Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the transmission fluid pressure sensor/switch for proper operation and replace if faulty.
  4. Check the transmission fluid level and quality. Perform a transmission fluid flush and refill if necessary.
  5. Clear the trouble code from the vehicle's computer and test drive the vehicle to ensure proper transmission operation.

Cost to Fix P0879

The typical repair costs for addressing a P0879 code can vary depending on the specific cause of the issue and the vehicle's make and model. In general, the cost of parts such as a transmission fluid pressure sensor or wiring harness can range from $50 to $200. Labor costs can vary between $100 to $300, depending on the shop's hourly rates and the complexity of the repair. Overall, the total repair cost for resolving a P0879 code could range from $150 to $500, but it's advisable to check with local auto repair shops for a more accurate estimate.

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Code P0879 Information for Specific Makes

  • P0879 Dodge — Transmission Fluid Pressure Sensor/Switch 'D' Circuit Intermittent
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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