C1774 Code - Coolant Temperature Out of Range
Quick Answer
The Anti-Lock Brake System (ABS) Module monitors the Coolant Temperature Sensor. Common causes include Faulty Coolant Temperature Sensor, Coolant Temperature Sensor harness is open or shorted, Coolant Temperature 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
- C1774 indicates Coolant Temperature Out of Range.
- Common causes
- Common causes include Faulty Coolant Temperature Sensor, Coolant Temperature Sensor harness is open or shorted, Coolant Temperature 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 C1774 Description
What are the Possible Causes of the DTC C1774?
- Faulty Coolant Temperature Sensor
- Coolant Temperature Sensor harness is open or shorted
- Coolant Temperature Sensor circuit poor electrical connection
How to Fix the DTC C1774?
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 C1774 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 C1774 Code
What does the OBDII code C1774 mean?
C1774 indicates that the vehicle's coolant temperature is out of the expected range, which can lead to performance issues or engine overheating.
What are common symptoms of the C1774 code?
Symptoms may include engine overheating, poor fuel economy, erratic engine performance, or the check engine light being illuminated.
What typically causes the C1774 code to trigger?
Common causes include a faulty coolant temperature sensor, a malfunctioning thermostat, wiring issues, or problems with the engine control module (ECM).
How can I diagnose a C1774 code?
Start by checking the coolant level and condition, inspect the coolant temperature sensor and wiring, and test the thermostat's functionality. Use a scan tool to monitor real-time data.
Is it safe to drive with the C1774 code?
It is not recommended to drive with this code as it may indicate overheating, leading to potential engine damage if not addressed promptly.
What repairs are commonly needed for the C1774 code?
Repairs may involve replacing the coolant temperature sensor, fixing wiring issues, or replacing the thermostat if it is found to be faulty.
How do I reset the C1774 code after repairs?
You can reset the code using an OBDII scanner, or by disconnecting the battery for a few minutes, but ensure the underlying issue is resolved first.
Can low coolant levels trigger the C1774 code?
Yes, low coolant levels can cause the engine to overheat and the coolant temperature to read inaccurately, triggering the C1774 code.
What is the cost of repairing issues related to the C1774 code?
Repair costs can vary widely depending on the specific issue, but sensor replacements may range from $50 to $200, while thermostat replacements can be $100 to $300 or more.
Discuss the causes and fixes for C1774 OBDII Code
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