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P1779 Buick Code - Engine Torque Delivered To TCM Signal

Quick Answer

The P1779 diagnostic trouble code for Buick vehicles indicates an issue with the Engine Torque Delivered To TCM Signal. Common causes include Faulty engine control module (ECM), Faulty transmission control module (TCM), Wiring harness issues. 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
P1779 Buick indicates Engine Torque Delivered To TCM Signal.
Common causes
Common causes include Faulty engine control module (ECM), Faulty transmission control module (TCM), Wiring harness issues.
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 P1779 Buick Description

The P1779 diagnostic trouble code for Buick vehicles indicates an issue with the Engine Torque Delivered To TCM Signal. This code is specifically related to the communication between the engine control module (ECM) and the transmission control module (TCM). The ECM calculates the engine torque and sends this information to the TCM to ensure proper transmission operation. When the TCM does not receive the expected torque signal from the ECM, it triggers the P1779 code.

OBDII Code P1779 Buick - Engine Torque Delivered To TCM Signal
P1779 Buick Code - Engine Torque Delivered To TCM Signal

Common Causes of P1779 Buick

  1. Faulty engine control module (ECM)
  2. Faulty transmission control module (TCM)
  3. Wiring harness issues
  4. Loose or corroded connectors
  5. Software glitches or outdated calibration

Symptoms of P1779 Buick

  1. Harsh or delayed shifting
  2. Erratic transmission behavior
  3. Reduced fuel efficiency
  4. Transmission slipping
  5. Check Engine Light illuminated

How to Fix P1779 Buick

  1. Connect an OBD-II scanner to the vehicle to read and record the fault code.
  2. Inspect the wiring harnesses and connectors for any damage or corrosion. Repair or replace as needed.
  3. Check and update the software in the ECM and TCM if necessary.
  4. Test the ECM and TCM for proper functionality and replace if faulty.
  5. Clear the fault code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1779 Buick

The cost of repairing the P1779 code on a Buick vehicle can vary depending on the specific cause of the issue. On average, you can expect to pay anywhere from $200 to $800 for parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's recommended to get a few quotes from different auto repair shops in your area. Additionally, the cost may be higher if any components need to be replaced.

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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.

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