P0118 – Engine Coolant Temperature Circuit High Input

Introduction

The P0118 error code on Geely is a fairly common issue that many drivers face.

The P0118 error code is often linked to issues with the engine coolant temperature circuit, which may be associated with problems in the engine’s cooling system.

WHAT DOES CODE P0118 MEAN

The P0118 error code means that the engine control module (ECM) has detected a high input voltage from the engine coolant temperature sensor circuit. This sensor plays a crucial role in monitoring the engine’s coolant temperature, which is essential for proper engine performance and fuel efficiency. The affected system is the engine’s cooling system, and the impact on engine performance can be significant, as it may lead to decreased power output, poor fuel efficiency, and potentially cause damage to the engine.

COMMON Geely MODELS AFFECTED

The P0118 error code can affect various Geely models, including:

• Geely Emgrand EC7
• Geely Emgrand EC8
• Geely GC2
• Geely GC5
• Geely GX7

SYMPTOMS TABLE

The following symptoms may be associated with the P0118 error code:

CAUSES TABLE

The following causes may be associated with the P0118 error code:

REAL-WORLD DRIVING SCENARIOS

When driving with the P0118 error code, the driver may experience issues such as decreased engine performance, poor fuel efficiency, and engine overheating. These issues may be more pronounced during cold starts, acceleration, or highway driving. The driver may also notice erratic engine idle, difficulty starting the engine, or illumination of the Check Engine Light.

DIAGNOSTIC STEPS

To diagnose the P0118 error code, the following steps can be taken:
1. Inspect the engine coolant temperature sensor and its wiring for any signs of damage or corrosion.
2. Use a scan tool to monitor the engine coolant temperature sensor’s voltage output and compare it to the specified range.
3. Check the sensor’s connector and wiring for any issues or damage.
4. Perform a mechanical check of the engine’s cooling system to ensure it is functioning properly.
5. If necessary, replace the engine coolant temperature sensor or repair any wiring issues.

COMMON DIAGNOSTIC MISTAKES

When diagnosing the P0118 error code, common mistakes include:
1. Failing to inspect the sensor’s wiring and connector.
2. Not using a scan tool to monitor the sensor’s voltage output.
3. Replacing the sensor without checking the wiring and connector.
4. Not performing a mechanical check of the engine’s cooling system.
5. Assuming the issue is with the ECM without checking the sensor and its circuit.

WHEN NOT TO REPLACE THE SENSOR

Replacing the engine coolant temperature sensor may not solve the issue if:
1. The wiring or connector is damaged or corroded.
2. There is a vacuum leak in the engine’s intake system.
3. The ECM has a software issue or calibration problem.
4. The engine’s cooling system has a mechanical issue, such as a faulty thermostat or water pump.

HOW TO FIX

To fix the P0118 error code, the following steps can be taken:
1. Replace the engine coolant temperature sensor if it is faulty.
2. Repair any wiring issues or corrosion in the sensor circuit.
3. Replace the sensor’s connector if it is damaged.
4. Perform a mechanical check of the engine’s cooling system and repair any issues found.
5. Use a scan tool to clear the code and monitor the engine’s performance.

SEVERITY LEVEL

The P0118 error code is considered to be of medium severity level. The driving risk is medium, and the urgency of repair is soon. The engine impact can be significant, as it may lead to decreased engine performance, poor fuel efficiency, and potentially cause damage to the engine.

IS IT SAFE TO DRIVE WITH THIS CODE

It is not recommended to drive with the P0118 error code for an extended period, as it may lead to decreased engine performance, poor fuel efficiency, and potentially cause damage to the engine. However, if the issue is not severe, it may be safe to drive for a short distance to a repair shop.

ESTIMATED REPAIR COST

The estimated repair cost for the P0118 error code can range from $50 to $500, depending on the cause of the issue and the labor costs.

PREVENTIVE MAINTENANCE TIPS

To prevent the P0118 error code, regular maintenance of the engine’s cooling system is recommended, including:
1. Checking the coolant level and condition.
2. Inspecting the engine’s belts and hoses for signs of wear.
3. Replacing the engine coolant temperature sensor at the recommended interval.
4. Using a scan tool to monitor the engine’s performance and detect any issues early.

EXPERT MECHANIC NOTE (E-E-A-T)

TOOLS REQUIRED FOR DIAGNOSTICS

The following tools are required for diagnosing the P0118 error code:

• Scan tool
• Multimeter
• Wiring diagram
• Engine coolant temperature sensor socket

TECHNICAL REFERENCE VALUES

The following technical reference values are relevant to the P0118 error code:

FAQ

1. What does code P0118 mean?
The P0118 error code means that the engine control module (ECM) has detected a high input voltage from the engine coolant temperature sensor circuit. This code is often linked to issues with the engine coolant temperature circuit, which may be associated with problems in the engine’s cooling system. The P0118 error code is a common issue that many drivers face, and it requires prompt attention to prevent further damage to the engine.
2. Is it safe to drive with code P0118?
It is not recommended to drive with the P0118 error code for an extended period, as it may lead to decreased engine performance, poor fuel efficiency, and potentially cause damage to the engine. However, if the issue is not severe, it may be safe to drive for a short distance to a repair shop. The P0118 trouble code can cause significant issues with the engine’s performance, and it is essential to address the problem as soon as possible.
3. Will the code clear itself?
The P0118 error code will not clear itself and requires diagnosis and repair to resolve the issue. The code is often linked to a faulty engine coolant temperature sensor or wiring issue, and it is essential to use a scan tool to monitor the sensor’s voltage output and compare it to the specified range. The Geely P0118 code is a common issue that many drivers face, and it requires prompt attention to prevent further damage to the engine.
4. Does the sensor need replacement?
The engine coolant temperature sensor may need replacement if it is faulty or damaged. However, it is essential to inspect the sensor’s wiring and connector for any signs of damage or corrosion before replacing the sensor. The P0118 error code can be caused by a variety of factors, including a faulty sensor, wiring issue, or ECM software issue, and it is essential to use a scan tool to diagnose the issue correctly. Diagnosing the P0118 code requires a thorough understanding of the engine’s cooling system and the sensor’s circuit.
5. How much does it cost to fix?
The estimated repair cost for the P0118 error code can range from $50 to $500, depending on the cause of the issue and the labor costs. The cost of repairing the P0118 trouble code can vary depending on the extent of the damage and the labor costs, and it is essential to consult a professional mechanic to determine the best course of action. Fixing the P0118 code requires a thorough diagnosis and repair, and it is essential to use a scan tool to monitor the engine’s performance and detect any issues early.

RELATED TROUBLE CODES

The following trouble codes are related to the P0118 error code:

• Error P0125 on Geely — Coolant Temperature Sensor Circuit Malfunction
• Error P0130 on Geely — Oxygen Sensor Circuit Malfunction
• Error P0155 on Geely — Oxygen Sensor Heater Circuit Malfunction
• Error P0217 on Geely — Engine Overheat Condition