AutoCodes – Cadillac – P1812 Cadillac

P1812 Cadillac Code - Transmission Fluid Overtemperature

Quick Answer

The Powertrain Control Module (PCM) detects a Transmission Fluid Temperature (TFT) sensor input of more than 266°F, all conditions met for over 6 minutes, 48 seconds. Common causes include Faulty Transmission Fluid Temperature (TFT) Sensor, Transmission Fluid Temperature (TFT) Sensor harness is open or shorted, Transmission Fluid Temperature (TFT) Sensor circuit poor electrical connection. 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 Cadillac indicates Transmission Fluid Overtemperature.
Common causes: Common causes include Faulty Transmission Fluid Temperature (TFT) Sensor, Transmission Fluid Temperature (TFT) Sensor harness is open or shorted, Transmission Fluid Temperature (TFT) Sensor circuit poor electrical connection.
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 Popularity 3,105

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1812 Cadillac Description

The Powertrain Control Module (PCM) detects a Transmission Fluid Temperature (TFT) sensor input of more than 266°F, all conditions met for over 6 minutes, 48 seconds.

OBDII Code P1812 Cadillac - Transmission Fluid Overtemperature - AutoCodes.com — P1812 Cadillac Code - Transmission Fluid Overtemperature

What does this mean?

What are the Possible Causes of the DTC P1812 Cadillac?

Faulty Transmission Fluid Temperature (TFT) Sensor
Transmission Fluid Temperature (TFT) Sensor harness is open or shorted
Transmission Fluid Temperature (TFT) Sensor circuit poor electrical connection

How to Fix the DTC P1812 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1812 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.

Frequently Asked Questions about P1812 Cadillac Code

1. What are the common symptoms of OBDII code P1812 Cadillac (Transmission Fluid Overtemperature)?

- Common symptoms include illuminated Check Engine Light, transmission overheating warning messages, and potential transmission shifting issues.

2. What are the possible causes of OBDII code P1812 Cadillac?

- Causes may include low transmission fluid levels, a faulty transmission fluid temperature sensor, a malfunctioning transmission control module (TCM), or an issue with the transmission cooler.

3. How can I diagnose the OBDII code P1812 Cadillac?

- Diagnosis typically involves checking the transmission fluid level and condition, testing the transmission fluid temperature sensor, and using a scan tool to retrieve and interpret the code.

4. What repairs are typically needed for OBDII code P1812 Cadillac?

- Repairs may involve topping up or changing the transmission fluid, replacing the transmission fluid temperature sensor, repairing or replacing the TCM, or addressing any issues with the transmission cooler.

5. Can driving with OBDII code P1812 Cadillac cause further damage to the vehicle?

- Continuing to drive with this code may lead to further transmission overheating, potential damage to transmission components, and worsened shifting issues, so it is advisable to address the problem promptly.

6. How urgent is it to address OBDII code P1812 Cadillac?

- It is recommended to address this code as soon as possible to prevent potential transmission damage or failure, as overheating can lead to costly repairs if left unattended.

7. Are there any DIY tips for resolving OBDII code P1812 Cadillac?

- DIY tips may include checking and topping up transmission fluid levels, inspecting for any visible leaks, and ensuring proper airflow to the transmission cooler.

8. Can resetting the OBDII code P1812 Cadillac resolve the issue?

- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the transmission fluid overtemperature problem.

9. Is it safe to continue driving if the transmission fluid overtemperature warning message appears?

- It is not recommended to continue driving if the transmission fluid overtemperature warning message appears, as it indicates a critical issue that needs attention to prevent damage to the transmission.

10. How much does it typically cost to repair OBDII code P1812 Cadillac?

- Repair costs can vary depending on the specific cause of the issue, but they may range from a simple sensor replacement to more extensive repairs involving the transmission system, costing anywhere from a few hundred to over a thousand dollars.