Chevrolet P1812: Transmission Fluid Over-Temperature

Is your scanner showing Chevrolet P1812?
No worries. We'll show you what it means and how to deal with it.

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OBDCodex, Editor

Chevrolet P1812: Transmission Fluid Over-Temperature

DIY Difficulty Level
Repair Cost
Can I Still Drive?
Yes (Short-term only)

What Does The Chevrolet P1812 Code Mean?

Engine started, and the PCM detected the Transmission Fluid Temperature (TFT) sensor indicated more than 266ºF for 7 minutes during the test.

What Are The Potential Causes Of The Chevrolet P1812 Code?

  • ATF level is low or the fluid is burnt or contaminated
  • ATF filter is clogged or not properly installed/seated
  • A/T line pressure is low (check for clogged cooler lines)
  • ECT sensor is contaminated or out-of-calibration (skewed)
  • Engine is overheated
  • Radiator

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> ACDelco Gold TF289 Automatic Transmission Fluid Filter Kit
>>> ACDelco GM Original Equipment 10-9243 Dexron VI Full Synthetic Automatic Transmission Fluid - 1 qt
>>> Dorman 624-558 Automatic Transmission Oil Cooler Hose Assembly
>>> ACDelco Professional 213-4514 Engine Coolant Temperature Sensor
>>> Chevrolet Radiator

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

GM, 2013, Service Bullettin – Prior To Any Circuit Testing.

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