P1792 Buick 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 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
- P1792 Buick 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
- 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.
Code P1792 Buick Description
What are the Possible Causes of the DTC P1792 Buick?
- 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 Buick?
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 Buick 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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Frequently Asked Questions about P1792 Buick Code
1. What does the OBDII code P1792 mean on a Buick?
P1792 indicates a problem with the Engine Control Module (ECM) to Transmission Control Module (TCM) signal related to engine coolant temperature.
2. What are the common symptoms of P1792 in a Buick?
Symptoms may include erratic transmission shifting, poor fuel economy, transmission stuck in limp mode, and an illuminated Check Engine Light.
3. What causes the P1792 code to appear?
Common causes include faulty coolant temperature sensors, wiring or connector issues between the ECM and TCM, or a malfunctioning ECM or TCM.
4. Can a low coolant level trigger the P1792 code?
Yes, low coolant levels can affect the coolant temperature sensor readings, which may trigger this code.
5. How do I troubleshoot the P1792 code on my Buick?
Start by checking the coolant level, inspect the coolant temperature sensor and its wiring, and verify the connections between the ECM and TCM.
6. Is it safe to drive with the P1792 code active?
Driving with P1792 active is not recommended, as it may cause transmission damage or poor vehicle performance.
7. How is the P1792 code diagnosed?
A mechanic will use a scan tool to read live data, inspect the wiring and connectors, and test the coolant temperature sensor and ECM/TCM functionality.
8. What repairs can fix the P1792 code on a Buick?
Repairs may include replacing a faulty coolant temperature sensor, repairing damaged wiring, or reprogramming/replacing the ECM or TCM.
9. Can a software update resolve the P1792 code?
In some cases, a software update for the ECM or TCM may resolve communication or calibration issues that cause the P1792 code.
10. How much does it typically cost to fix the P1792 code?
Repair costs can range from $100 to $500 or more, depending on the specific issue, such as a sensor replacement or ECM/TCM repair.
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