P1798 Code - Coolant Temperature Circuit Malfunction
Quick Answer
The P1798 diagnostic trouble code (DTC) indicates a malfunction in the coolant temperature circuit. Common causes include Faulty coolant temperature sensor, Damaged wiring or connectors in the coolant temperature circuit, Corrosion or contamination in the coolant temperature sensor. 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
- P1798 indicates Coolant Temperature Circuit Malfunction.
- Common causes
- Common causes include Faulty coolant temperature sensor, Damaged wiring or connectors in the coolant temperature circuit, Corrosion or contamination in the coolant temperature sensor.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1798 Description
The P1798 diagnostic trouble code (DTC) indicates a malfunction in the coolant temperature circuit. This code is typically triggered when the Engine Control Module (ECM) detects that the signal from the coolant temperature sensor is outside the expected range. The coolant temperature sensor is responsible for monitoring the temperature of the engine coolant, which is crucial for the proper operation of the engine.
Common Causes of P1798
- Faulty coolant temperature sensor
- Damaged wiring or connectors in the coolant temperature circuit
- Corrosion or contamination in the coolant temperature sensor
- Malfunctioning ECM
- Coolant leak affecting sensor readings
Symptoms of P1798
- Check Engine Light illuminated on the dashboard
- Engine running hotter or colder than normal
- Poor fuel economy
- Rough idling or stalling
- Engine overheating
How to Fix P1798
- Begin by diagnosing the issue using a scan tool to retrieve the specific trouble code and identify the root cause of the problem.
- Inspect the coolant temperature sensor, wiring, and connectors for any signs of damage or corrosion. Replace any faulty components as needed.
- Test the coolant temperature sensor using a multimeter to ensure it is providing accurate readings.
- Clear the DTC from the ECM memory using the scan tool and perform a test drive to verify that the issue has been resolved.
- If the problem persists, further diagnostics may be required to pinpoint the exact cause of the coolant temperature circuit malfunction.
Cost to Fix P1798
The typical repair costs for a coolant temperature circuit malfunction can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing a faulty coolant temperature sensor can cost between $50 and $200, including parts and labor. However, if additional components such as wiring or connectors need to be replaced, the total repair cost can increase. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate.
Need more information about the P1798 code?
Need more information on how to fix the P1798 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1798 code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1798 Code
No Frequently Asked Questions about P1798 Code found.
Discuss the causes and fixes for P1798 OBDII Code
Code P1798 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.