AutoCodes – Generic – P1792

P1792 Code - ECM to TCM Engine Coolant Signal

Quick Answer

With the key on or engine running, the Powertrain Control Module (PCM) detects that the Engine Coolant Temperature (ECT) sensor signal was below the lower or over the upper limit, or that the ECT signal was unreliable, conditions met for one second. Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Engine Coolant Temperature (ECT) sensor harness is open or shorted, Engine Coolant Temperature (ECT) sensor circuit poor electrical connection. 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 (ECT) sensor, Engine Coolant Temperature (ECT) sensor harness is open or shorted, Engine Coolant Temperature (ECT) sensor circuit poor electrical connection.
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.

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Code Popularity 33,152

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1792 Description

OBDII Code P1792 - ECM to TCM Engine Coolant Signal - AutoCodes.com — P1792 Code - ECM to TCM Engine Coolant Signal

What does this mean?

What are the Possible Causes of the DTC P1792?

Faulty Engine Coolant Temperature (ECT) sensor
Engine Coolant Temperature (ECT) sensor harness is open or shorted
Engine Coolant Temperature (ECT) sensor circuit poor electrical connection

How to Fix the DTC P1792?

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 P1792 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.

Need more information about the P1792 code?

Need more information on how to fix the P1792 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1792 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1792 Acura — Automatic Transmission EEPROM Checksum Error
P1792 Buick — ECM to TCM Engine Coolant Signal
P1792 Cadillac — ECM to TCM Engine Coolant Signal
P1792 Chevrolet — ECM to TCM Engine Coolant Signal
P1792 GMC — ECM to TCM Engine Coolant Signal
P1792 Honda — Automatic Transmission EEPROM Checksum Error
P1792 Isuzu — Automatic Transmission EEPROM Checksum Error
P1792 Mazda — Barometric Pressure Sensor Circuit Malfunction

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.