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Engine-Codes – Generic – P1623

P1623 Code - Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions

Quick Answer

The P1623 diagnostic trouble code refers to an issue with the Transmission Fluid Temperature Sensor Pull-Up Resistor Circuit. Common causes include Faulty Transmission Fluid Temperature Sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to the sensor or circuit. 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
P1623 indicates Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions.
Common causes
Common causes include Faulty Transmission Fluid Temperature Sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to the sensor or circuit.
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 07, 2024
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Code P1623 Description

The P1623 diagnostic trouble code refers to an issue with the Transmission Fluid Temperature Sensor Pull-Up Resistor Circuit. This sensor is responsible for monitoring the temperature of the transmission fluid and relaying that information to the vehicle's computer system. The pull-up resistor circuit is essential for ensuring accurate readings from the sensor. When this circuit encounters a problem, it can lead to inaccurate temperature readings, which may affect the vehicle's performance and overall drivability.

OBDII Code P1623 - Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions
P1623 Code - Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions

Common Causes of P1623

  1. Faulty Transmission Fluid Temperature Sensor
  2. Wiring or connector issues in the sensor circuit
  3. Corrosion or damage to the sensor or circuit
  4. Malfunctioning vehicle computer system
  5. Issues with the pull-up resistor circuit

Symptoms of P1623

  1. Check Engine Light illuminated
  2. Transmission shifting issues
  3. Reduced fuel efficiency
  4. Engine performance issues
  5. Transmission temperature gauge reading inaccurately

How to Fix P1623

  1. Begin by diagnosing the root cause of the P1623 code using a diagnostic scanner to pinpoint the exact issue with the Transmission Fluid Temperature Sensor Pull-Up Resistor Circuit.
  2. Inspect the sensor, wiring, and connectors for any visible damage, corrosion, or loose connections. Repair or replace any damaged components as needed.
  3. Test the pull-up resistor circuit to ensure it is functioning correctly. Replace the resistor if it is faulty.
  4. Clear the trouble code from the vehicle's computer system using the diagnostic scanner.
  5. Test drive the vehicle to verify that the issue has been resolved and that the Check Engine Light does not reappear.

Cost to Fix P1623

The cost of repairing the Transmission Fluid Temperature Sensor Pull-Up Resistor Circuit can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the parts for this repair could range from $50 to $200, while the labor costs could be between $100 and $300. Overall, the total repair cost for addressing the P1623 code may fall within the range of $150 to $500. It is recommended to consult with a professional mechanic to obtain an accurate estimate tailored to your vehicle's make and model. Keep in mind that labor rates and part prices can fluctuate based on location and other factors, so it's advisable to shop around for the best deal.

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Code P1623 Information for Specific Makes

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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