P0118 – Engine Coolant Temperature Circuit High Input
The P0118 error code on Changan is a fairly common issue that many drivers face.
What does code P0118 mean
The P0118 error code on Changan vehicles refers to a problem with the engine coolant temperature circuit, specifically a high input reading. This code is typically triggered when the engine control module (ECM) detects a voltage reading from the coolant temperature sensor that is outside the expected range. The coolant temperature sensor is responsible for monitoring the temperature of the engine coolant and providing this information to the ECM, which uses it to adjust engine performance, fuel injection, and other critical functions.
Common Changan models affected
- Changan CS75
- Changan CS35
- Changan Raeton
- Changan Eado
- Changan Alsvin
Symptoms
- Check Engine Light illumination
- Engine overheating or running hot
- Coolant temperature gauge reading incorrectly
- Decreased engine performance or power
- Difficulty starting the engine
- Increased fuel consumption
- Erratic engine idle or stalling
Causes
| Potential Cause | Probability (High/Medium/Low) |
|---|---|
| Faulty engine coolant temperature sensor | High |
| Wiring or connection problems | Medium |
| Corrosion or damage to the sensor or wiring | Medium |
| ECM malfunction or software issue | Low |
| Coolant temperature gauge malfunction | Low |
| Other engine or cooling system problems | Low |
Diagnostic Steps
To diagnose the P0118 error code, a technician will typically start by checking the engine coolant temperature sensor and its wiring for any signs of damage or corrosion. They will then use a scan tool to monitor the sensor’s voltage reading and compare it to the expected range. The technician will also check the engine’s coolant level and condition, as well as the thermostat and cooling system for any blockages or leaks. Readings should change smoothly depending on engine RPM and temperature.
How to Fix
The primary repair method for the P0118 error code is to replace the faulty engine coolant temperature sensor. In some cases, repairing or replacing the wiring or connections may also be necessary. If the ECM is malfunctioning, it may need to be reprogrammed or replaced.
Is it safe to drive with this code
Driving with the P0118 error code active can pose some technical risks, as the engine may not be operating within its optimal temperature range. This can lead to decreased engine performance, increased fuel consumption, and potentially even engine damage. It is recommended to address the issue as soon as possible to avoid any further problems.
Estimated Repair Cost
The estimated repair cost for the P0118 error code can range from $100 to $500, depending on the specific cause of the problem and the labor rates of the repair shop.
Preventive Maintenance Tips
To prevent the P0118 error code from occurring, it is essential to regularly check the engine coolant level and condition, as well as the thermostat and cooling system for any blockages or leaks. Additionally, ensuring that the engine coolant temperature sensor and its wiring are clean and free of corrosion can help prevent problems.
Related Trouble Codes
- Error P0122 on Changan — a low voltage reading from the engine coolant temperature sensor
- Error P0123 on Changan — a high voltage reading from the engine coolant temperature sensor
- Error P0217 on Changan — an engine overheating condition
- Error P0222 on Changan — a faulty engine coolant temperature sensor circuit