P0118 - Engine Coolant Temperature Sensor Circuit High Input

Your car has an obd2 error - P0118 and you DO NOT know the cause and how to fix this error? We have created a comprehensive article in which we explain what error p0118 means, symptoms, causes and solutions depending on the make of your vehicle.

OBD-II DTC Datasheet

• P0118 - High input signal of the coolant temperature sensor circuit.

P0118 OBD2 Error Code Description

The engine coolant temperature sensor (also called ETC) is used by the vehicle to measure the engine coolant temperature. This sensor modifies the voltage signal from the engine control module (ECM) and feeds back to that module again, returning as the engine coolant temperature input.

ETC directly uses the temperature sensitive thermistor, finding that the electrical resistance of the thermistor decreases as the overall temperature increases. When, if the ECM detects discrepancies in the received temperature readings, an OBDII DTC - P0118 is displayed.

Fault code P0118 OBDII indicates that the engine has been running for a while and the ETC has continuously read temperatures below freezing. This OBD2 DTC can also be found if the ECM determines that the sensor resistance is out of specification.

What does the error code mean P0118?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to all vehicles since 1996 (Honda, Toyota, Volkswagen VW, Mazda, Dodge, Ford, BW, etc.). Although general in nature, the specific repair steps may differ depending on the brand / model.

The engine coolant temperature (ECT) sensor is a thermistor screwed into the coolant channel in the cylinder head. The sensor resistance is high when the coolant temperature is low and the resistance drops when the coolant temperature rises.

The powertrain control module (PCM) provides a 5V reference and sensor ground. The PCM monitors the voltage drop to determine the coolant temperature. If ECT shows temperature below freezing point. when the engine has been running for more than a few minutes, the PCM detects a circuit fault and sets this code. Or, if the PCM determines that the sensor resistance is out of specification, this code is set.

Example of an ECT engine coolant temperature sensor

Severity and danger of code P0118

When you look at the symptoms, you may wonder if the P0118 code is that serious. If you do not notice any abnormal situations while driving, what does it matter?

The truth is that while you may not notice any abnormal symptoms, that doesn't mean there aren't potential problems that could arise if you're driving with a P0118 code. First, you increase wear on various components.

Your motor fan is not supposed to run non-stop, and overuse can wear it out prematurely. And because your engine can't tell you that the coolant is getting too hot, you've also lost the engine's ability to stop to save itself. overheating.

If you're driving with a P0118 code, you likely won't notice anything wrong until things go wrong. And since a P0118 code is relatively easy and cheap to fix, the last thing you want to do is risk your entire engine on a cheap fix.

Possible symptoms

P0118 symptoms may include:

• Very low fuel economy
• Problems when starting a car
• The car may start, but the drive is very bad, black smoke is coming out, the drive is very rough and the ignition is skipped
• MIL illumination (The engine warning light on the instrument panel comes on.)
• Excessive black smoke from the exhaust pipe.

Causes of the error P0118

The P0118 code may mean that one or more of the following events have occurred:

• Bad connection at the sensor
• An open in the ground circuit between the ECT sensor and the PCM.
• Short circuit in the voltage supply circuit between the sensor and the PCM Defective or defective PCM. (less likely)
• Defective temperature sensor (internal short circuit)

Possible solutions

First, if you have access to a scan tool, check the coolant sensor reading. Is it reading a logical number? If so, the problem is most likely temporary. Perform the wiggle test by rotating the connector and harness towards the sensor while observing the readings on the scan tool. Watch out for any dropouts. A dropout indicates a bad connection. If the scan tool displays an incorrect temperature, check the resistance of the temperature sensor. If it is out of specification, replace it. If specified in the specifications, disconnect the transducer and, using a fused jumper wire, connect the two terminals of the connector together. The temperature should now be above 250 degrees Fahrenheit. If not, there is likely a problem with the ground circuit or voltage source.

Check for a 5V reference on the connector. Also check if the connector is grounded. If you don't have 5V ref. and / or ground continuity, check for any on the PCM connector. If present on the PCM connector, repair open or short between PCM and sensor. If you don't, remove the faulty wire from the PCM and then check for the correct voltage on the PCM pin. If present now, repair the short in the circuit. If not after disconnecting the wire and checking the connection, replace the PCM.

NOTE: Typically P0118 indicates a faulty temperature sensor, but does not exclude these other possibilities. If you don't know how to diagnose PCM, don't try.

Other engine coolant indicator codes: P0115, P0116, P0117, P0118, P0119, P0125, P0128

The sequence of actions when correcting an OBD2 error code is P0118

• Using a scan tool, check the coolant sensor reading. If the values ​​obtained are logical, the P0118 DTC is intermittent, and if so, you will need to adjust or reposition the connector and wiring on the sensor while observing the meter reading.
• If illogical values ​​are found in the previous reading, it will be necessary to check the resistance of the temperature sensor. If it is out of specification, replace the sensor.
• If the resistance of the temperature sensor is within specification, you will need to use a fused jumper wire, connecting the two terminals of the connector this way and making sure the temperature peaks above 250 degrees. F (about 121 degrees C). If these results are not present, the problem is with the ground circuit or supply voltage.
• Replace temperature sensor if all else fails.

Honda P0118 Engine Coolant Temperature Sensor (ECT) Circuit High Diagnosis and Repair

Code P0118 Nissan

Code Description Nissan P0118 OBD2

Its datasheet is "High road in engine coolant temperature sensor circuit". This DTC is a generic transmission code, so it affects all cars with OBD2 connection, regardless of make or model.

The engine coolant temperature sensor, also abbreviated as ECT, is a thermistor located in the coolant passage in the cylinders. With the important work of balancing the coolant temperature.

What does P0118 Nissan OBD2 trouble code mean?

To balance the coolant temperature, the sensor must increase resistance when the coolant temperature is low, and the resistance decreases as the coolant temperature rises.

If the ECT fails for more than 2 minutes for any reason, the PCM will issue an obvious error and code P0118 will be set on your Nissan vehicle.

Symptoms of the P0118 Nissan error

• Excessive consumption of gasoline.
• Troubleshooting engine problems such as hard starting, hesitation, and sometimes outright failures.
• The Check Engine indicator is always present on the car dashboard.
• Black smoke comes out of the exhaust pipe.

Troubleshooting Nissan P0118 OBDII Error Code

• Using a multimeter, verify that the ECT connector has a 5 volt reference and an appropriate ground wire.
• Check each wire associated with the ECT sensor for corrosion or other damage.
• To rule out that the problem is with the ECT sensor and the computer, disconnect the sensor and use a fusible link to connect the 2 pins of the connector together. Your reading should reach around 250 degrees Fahrenheit. If not, check the ground circuit and supply voltage.
• If each of the above checks is correct and has no errors, the ECT sensor is probably defective and needs to be replaced.

Causes of Nissan DTC P0118

• The earth is sometimes faulty with a short circuit.
• Supply voltage low or short circuit.
• The ECT sensor is disabled.
• Incorrect connection to the engine coolant temperature sensor.

Code P0118 Toyota

Code description Toyota P0118 OBD2

The ECT sensor is a sensor that continuously changes and adapts its resistance based on the engine coolant temperature. The ECM will continuously monitor the sensor resistance temperature. If you notice an unspecified interval within minutes, code P0118 will be generated.

What does the P0118 Toyota OBD2 trouble code mean?

The ECT sensor operates via a 5 volt reference provided by the electrical control module itself. The lower the coolant temperature, the higher the applied resistance, and the higher the coolant temperature, the lower the resistance.

Symptoms of error Toyota P0118

• Check Engine is always present.
• In Toyota models, you will notice an increase in gas mileage or gas mileage, as the case may be.
• Starting the engine will take much longer than usual.
• Due to the high fuel consumption, the air/fuel ratio will be unstable, resulting in black smoke coming out of the exhaust pipe.

Eliminate the error code Toyota P0118 OBDII

• Verify that the coolant temperature sensor reading is correct. It should be between -4 and -46 degrees Fahrenheit. If they are incorrect, the sensor must be replaced.
• Make sure the sensor connection wires are not shorted or damaged. To do this, stretch, pull and move the cables.
• Connect the 2 terminals of the ECT sensor with another cable, for this it also uses the ECU. In doing so, we check that its temperature reaches 250 degrees Fahrenheit.
• Check the coolant level.
• Check the operation of the ECT sensor at full throttle. In doing so, we check that the temperature readings of the sensor are consistent with the required measurements.

Causes of DTC P0118 Toyota

• In Toyota models, the code P0118 is caused by a low coolant level.
• The ECT sensor is damaged.
• Faulty engine coolant thermostat.
• The cable system that communicates with the ECT sensor can be open-circuited or short-circuited.
• Poor ECT sensor circuit connection.

Code P0118 Chevrolet

Description of code P0118 OBD2 Chevrolet

This OBD2 code fires automatically when your Chevrolet vehicle's computer detects erratic behavior engine coolant temperature (ECT) sensor.

What does the P0118 Chevrolet OBD2 trouble code mean?

The function of this sensor, located in the coolant passage, is to maintain a stable temperature of the engine antifreeze, preventing it from freezing.

Your Chevy's computer knows exactly when the engine starts and starts to warm up. If the computer does not detect temperature changes due to the ECT sensor and a very low level is reached, the computer generates a code P0118 and warns with the Check Engine light.

Symptoms of error P0118 Chevrolet

• The vehicle does not pass the pollution test.
• The Check Engine light will always be on.
• You will notice high fuel consumption.
• Prolonged engine start.

Eliminate the error code Chevrolet P0118 OBDII

You can try solutions previously featured in brands such as Toyota, Nissan or the universal section with a wide variety of repair options.

Cause of DTC P0118 Chevrolet

• A bad sensor connection could be a simple cause.
• Short circuit in the supply voltage between the sensor and the computer.
• The sensor or PCM may be damaged.
• Short or open circuit between ECT sensor and PCM.
• Damaged or corroded sensor cables.

Code P0118 Chrysler

Chrysler P0118 OBD2 Code Description

We must keep in mind that code P0118 is a generic OBD2 code, which means that practically all vehicles, regardless of make or model, manufactured after 1996 may have this defect.

This powertrain failure is due to poor engine coolant temperature readings. Causes failures in most of the starter and fuel system.

What does Chrysler P0118 OBD2 trouble code mean?

Since these are generic codes, the meaning of this Chrysler P0118 code can be found in brands such as Toyota or Chevrolet mentioned above.

Symptoms of error Chrysler P0118

• Your check engine will light up on the dashboard.
• Difficulty starting is the most common of the symptoms.
• Excellent fuel consumption, which also causes black smoke from the exhaust pipe.

Chrysler P0118 Eliminate the error code OBDII

• The ECT sensor will need to be replaced if the resistor temperature is found to be out of specification.
• Check the voltage and ground of the connector.
• Check the wires and circuits associated with the ECT sensor. Look for any signs of corrosion or short circuits. Replace if necessary.
• Since this is a generic code, this information can be supplemented by brands already mentioned, such as Toyota.

Cause of DTC P0118 Chrysler

• A common cause in Chrysler vehicles is corrosion or contamination of the engine coolant.
• ECT sensor wiring or connections may be faulty, shorted, misplaced, or disconnected.
• Defective ECT or PCM sensor.
• Damaged engine coolant thermostat.
• Low engine coolant level.
• The electrical connection that powers the ECT sensor may be bad.

Code P0118 Ford

Ford P0118 OBD2 code description

ECT sensor is a sensor that, depending on the temperature of the engine coolant, changes its temperature to prevent freezing. The ECM monitors the performance of this key part and is tasked with determining if it is operating within its set ranges or if DTC P0118 is present.

What does the P0118 Ford OBD2 trouble code mean?

Considering that the P0118 code is a generic code, its concept similarity between brands covers most of the information, it is possible to find out the meaning of this code in brands such as Chrysler or Nissan.

Symptoms of the Ford P0118 error

• The Check Engine light will come on.
• High fuel consumption will be evident.
• Difficulties starting the car will be common.

Eliminate the error code Ford P0118 OBDII

Try the solutions provided by previous brands such as Toyota and Chrysler or with the generic code P0118 presented at the beginning.

Cause of DTC P0118 Ford

• The engine manifold absolute pressure sensor supply voltage may be low due to a short circuit.
• Cables are usually the cause of this type of failure, possibly being poorly connected, damaged, shorted, or corroded.
• Defective ECT or PCM sensor.

Code P0118 Mitsubishi

Mitsubishi P0118 OBD2 code description

The description of the code P0118 in Mitsubishi vehicles is completely the same as that of brands such as Toyota or Chrysler.

What does Mitsubishi OBD2 DTC P0118 mean?

Is it really dangerous or unsafe to drive with code P0118? When code P0118 is detected, the engine ECM will be put into safe mode. This will cause the car to run very slowly until it reaches a good temperature.

If you continue to drive with this OBD2 code, in addition to fear of injury away from home, this action can lead to further breakdowns that have not yet been.

Symptoms of Mitsubishi error P0118

• The ECM turns on the Check Engine light and in some cases goes into safe mode.
• This code is accompanied by difficult starting, especially with a cold engine.
• Unstable and unstable engine operation.
• Black smoke and high fuel consumption.

Eliminate the error code Mitsubishi P0118 OBDII

• Inspect for disconnected or damaged ECT sensor connectors by shaking and squeezing to see if they are damaged.
• Erase the code and retry the system, in rare cases the same computer is the problem computer.
• You can disconnect the sensor connector and check for corrosion or bent pins, if so, replace them.
• Disconnect the connector and make sure it has 5 volts and a proper ground.
• Jumper between the 2 pins of the ECT connector with a wire and check with an automotive scanner that the reading is greater than 250 degrees Fahrenheit. If it does not reach this temperature, the fault lies in the connecting line from the ECT to the ECU.

Causes of the Mitsubishi P0118 DTC

The reasons for this annoying P0118 code are the same as for brands like Toyota or Nissan. You can try them.

Code P0118 Volkswagen

Code Description P0118 OBD2 VW

This indispensable ECT sensor used to control fuel delivery, ignition, electrical cooling, IAC valve and EVAP valve.

Their proper functioning helps the engine perform optimally, so we need to pay close attention from the moment a code P0118 is discovered and fix it as soon as possible.

What does VW OBD2 DTC P0118 mean?

Being generic codes, you can find out the meaning of this code in the concepts mentioned above from brands like Toyota or Nissan.

Symptoms of error VW P0118

• Multi-year initial state.
• The engine will oscillate and run unevenly at the start of the day in cold weather.
• Excessive consumption of gasoline, and therefore, constant black smoke coming out of the exhaust pipe.
• Check if the engine light is on.

Eliminate the error code P0118 OBDII VW

Try solutions previously exhibited by brands such as Toyota and Mitsubishi, you are sure to find the right one for your VW.

Causes of DTC P0118 VW

• Bad contact in the sensors always leads to failure.
• Although it is unlikely that the PCM could be faulty.
• Short circuit in supply voltage between ECT sensor and PCM.
• The ECT sensor may have an internal malfunction.
• The wiring connected to the sensor may be corroded or misplaced.

Code P0118 Hyundai

Hyundai P0118 OBD2 Code Description

Considering that we are dealing with a shared code, most tips and guides apply regardless of make and model , so you can find out its description for brands like Toyota or Nissan or others mentioned above.

What does the P0118 Hyundai OBD2 trouble code mean?

This code affects cars from 1996 onwards. What should be considered if this code appears on your Hyundai vehicle? Although the engine has not yet been started, it is important to investigate the problem as soon as possible.

This code indicates that the ECT sensor is not operating within the appropriate temperature ranges. Because your job of balancing the engine coolant temperature with a resistor is not complete.

Symptoms of error Hyundai P0118

• When this code exists, you will notice how the performance of the engine drops noticeably. There will be long starts and wobbling in the engine.
• Excessive fuel consumption will be the result of gasoline passing through the injectors.
• Check Engine work will always be present.

Eliminate the error code Hyundai OBDI P0118

We encourage you to try the solutions we mentioned earlier in the generic code P0118 or brands like Toyota or Nissan. You will definitely find the right solution.

Cause of DTC P0118 Hyundai

• Low engine coolant level.
• Electrical circuits involved may be corroded, shorted, or poorly connected.
• Although this is not a common occurrence, it is possible that the PCM is faulty.
• Poor connection of the electrical circuit to the ECT sensor.

Code P0118 Dodge

Description of error P0118 OBD2 Dodge

• If your car is a Dodge, you should be aware that this code will only run if the resistance of the ECT sensor, which is responsible for the constant change depending on the coolant temperature, does not change or does so erroneously for more than 2 minutes.
• It is necessary to find the root of the problem and solve it as soon as possible. Otherwise, this emergency mode will affect other engine components that are not already affected.

What does the P0118 Dodge OBD2 trouble code mean?

The meaning of the code P0118 in Dodge is the same as the code in Toyota and Nissan. With slight differences in brand terms and concepts.

Symptoms of a P0118 Dodge Code

• Poor fuel economy.
• Startless state.
• The car will have great difficulty starting and after starting it will bounce and wobble.
• The MIL indicator will light up.

Eliminate the error code Dodge P0118 OBDII

You can try the solutions already provided by Toyota, Nissan and the code in its universal mode.

Cause of DTC P0118 Dodge

This is a common code, the reasons for which are similar to brands such as Hyundai or Volkswagen. Try them.