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Engine-Codes – Generic – P1812

P1812 Code - Transmission Fluid Overtemperature

Quick Answer

The P1812 diagnostic trouble code indicates that the transmission fluid in the vehicle is overtemperature. Common causes include Driving in extreme temperatures, Towing heavy loads, 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
P1812 indicates Transmission Fluid Overtemperature.
Common causes
Common causes include Driving in extreme temperatures, Towing heavy loads, 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P1812 Description

The P1812 diagnostic trouble code indicates that the transmission fluid in the vehicle is overtemperature. Transmission fluid plays a crucial role in ensuring smooth gear shifts, reducing friction, and preventing overheating within the transmission system. When the fluid becomes too hot, it can lead to a range of issues that can affect the performance and longevity of the transmission.

OBDII Code P1812 - Transmission Fluid Overtemperature
P1812 Code - Transmission Fluid Overtemperature

Common Causes of P1812

  1. Driving in extreme temperatures
  2. Towing heavy loads
  3. Low transmission fluid levels
  4. Malfunctioning cooling system
  5. Faulty transmission fluid cooler

Symptoms of P1812

  1. Rough or delayed gear shifts
  2. Slipping gears
  3. Transmission overheating warning light
  4. Decreased fuel efficiency
  5. Transmission fluid leaks

How to Fix P1812

  1. Check transmission fluid level and condition: Ensure that the transmission fluid is at the correct level and not burnt or contaminated. If necessary, perform a transmission fluid flush and refill.
  2. Inspect the cooling system: Check the condition of the transmission fluid cooler, radiator, and hoses for any leaks, blockages, or malfunctions. Repair or replace components as needed.
  3. Test transmission control module: Use a diagnostic scanner to check for any fault codes stored in the transmission control module. Reset the codes and monitor the transmission fluid temperature while driving to verify the issue has been resolved.
  4. Monitor transmission fluid temperature: Install a transmission fluid temperature gauge to monitor the fluid temperature and prevent overheating in the future.
  5. Seek professional help: If the issue persists or if you are not comfortable performing the repairs yourself, it is recommended to consult a qualified mechanic or transmission specialist for further diagnosis and repair.

Cost to Fix P1812

The cost of repairing a transmission fluid overtemperature issue can vary depending on the extent of the damage, the specific cause of the problem, and the make and model of the vehicle. On average, the repair costs can range from $200 to $500, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary significantly based on location, shop rates, and other factors. It is advisable to obtain quotes from multiple shops to get a more accurate estimate for the repair.

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Code P1812 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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