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Engine-Codes – Generic – P1792

P1792 Code - ECM to TCM Engine Coolant Signal

Quick Answer

The P1792 diagnostic trouble code (DTC) indicates a problem with the Engine Control Module (ECM) communicating the engine coolant temperature signal to the Transmission Control Module (TCM). Common causes include Faulty engine coolant temperature sensor, Damaged or corroded wiring/connectors between ECM and TCM, ECM or TCM malfunction. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P1792 indicates ECM to TCM Engine Coolant Signal.
Common causes
Common causes include Faulty engine coolant temperature sensor, Damaged or corroded wiring/connectors between ECM and TCM, ECM or TCM malfunction.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1792 Description

The P1792 diagnostic trouble code (DTC) indicates a problem with the Engine Control Module (ECM) communicating the engine coolant temperature signal to the Transmission Control Module (TCM). This signal is crucial for proper engine and transmission operation as it helps regulate various functions such as fuel delivery, ignition timing, and transmission shifting points.

OBDII Code P1792 - ECM to TCM Engine Coolant Signal
P1792 Code - ECM to TCM Engine Coolant Signal

Common Causes of P1792

  1. Faulty engine coolant temperature sensor
  2. Damaged or corroded wiring/connectors between ECM and TCM
  3. ECM or TCM malfunction
  4. Low coolant level or coolant system issues
  5. Electrical issues such as a blown fuse or relay

Symptoms of P1792

  1. Rough shifting or delayed gear changes
  2. Engine running poorly or rough idling
  3. Poor fuel economy
  4. Engine overheating
  5. Check Engine Light illuminated

How to Fix P1792

  1. Use a diagnostic scan tool to retrieve the trouble code and freeze frame data
  2. Inspect and test the engine coolant temperature sensor
  3. Check wiring and connectors for any signs of damage or corrosion
  4. Test the ECM and TCM for proper operation
  5. Replace any faulty components or repair wiring/connectors as needed

Cost to Fix P1792

The typical repair cost for addressing the P1792 code can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty engine coolant temperature sensor can range from $50 to $200, while diagnosing and repairing wiring/connectors or ECM/TCM issues may cost between $100 to $500 or more. Labor costs can add an additional $80 to $150 per hour, and the total repair bill may range from $150 to $1000 or more. It's recommended to consult a professional mechanic for an accurate diagnosis and cost estimate.

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Code P1792 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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