Dealing with automotive problems can be irritating, especially when a code shows on the dashboard. The P0118 code is one that frequently causes problems for drivers. In this post, we will look at the causes and difficulties linked with this unpleasant code and suggest solutions to help you deal with it.
Table of Contents
What is the P0118 Code?
The P0118 code indicates problems with the Engine Coolant Temperature (ECT) circuit and its associated sensor. The ECT is a thermistor, or electrical resistor, whose resistance is considerably lowered when heated. The ECT is positioned in the coolant tube of the engine’s cylinder head.
WHAT ARE THE MOST COMMON REASONS?
Multiple factors could cause this error message, so don’t presume a single cause. The difficulty code could be referencing various underlying issues. A simple issue could be a defective sensor connection or a faulty ground circuit between the engine coolant temperature sensor and the Powertrain control module.
There is also the possibility of a voltage short between the sensor and the Powertrain control module. Alternatively, a temperature sensor may have shorted internally. However, while less likely than the other defects stated, you could have a malfunctioning Powertrain Control Module. Diagnostic and scanning technologies will be necessary to identify the root cause of these electronic difficulties.
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DOES P0118 code SYMPTOMS?
As with most problem codes, the malfunction indication bulb or check engine light will most likely illuminate first. This issue code presents severe symptoms in addition to the principal indicator. For instance, the fuel efficiency will be extremely bad. Additionally, you might be unable to start your vehicle. However, even if you can start your automobile, you may have problems such as misfires, rough running, black smoke, etc. As a result, while some diagnostic codes may be safely disregarded, this is not one of them. Your vehicle’s operation will likely be severely limited once the fundamental problem is remedied.
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WHAT ARE THE P0118 CODE PROBABLE SOLUTIONS?
A scan tool is required to begin the repair process. You will use this tool to verify the coolant sensor reading. What’s the reading? Does this make sense? If it does, you can assume that the problem is only intermittent. You can further diagnose the problem by wriggling the sensor harness and connector and observing the readings for drop-outs or illogical results. A faulty connection most likely causes dropouts.
If the readings are irrational and outside your car’s range, you may need to replace the sensor. If the values are within range, use a fused jumper wire to increase the temperature readings. If the readings do not peak at 250 degrees Fahrenheit, there is likely a problem with the voltage supply or ground circuit.
Check for shorts or ground continuity along wires and connections and fix them as necessary. A defective temperature sensor or wiring/connection difficulties might cause the OBD-II scanner to error code P0118. Because of the risks associated with driving, resolving your issue before getting behind the wheel is essential.
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What symptoms are associated with this code?
Common symptoms connected with a code P0118 are the following:
- check engine light
- The engine temperature indicator is giving irregular readings.
- Reduced fuel efficiency
- Starting the engine is difficult, especially during cold weather.
- While warming up, the engine hesitates or runs erratically; once warmed up, it usually operates.
- Unsuccessful emissions test
What causes code P0118?
A code P0118 might result from a variety of factors. That is why a proper diagnosis is critical. The causes of this code include:
- Engine coolant temperature sensor malfunction ($100–$300).
- Dirty or rusted engine coolant that requires replacement ($100-$200)
- Damaged, unclean, or degraded wiring to the ECT sensor.
- Corrosion of the sensor or ECM connectors
- ECM issues
How to Fix P0118?
If a diagnostic scan of your vehicle reveals a code P0118, a technician will run tests to determine the problem. These tests include searching for any applicable issue codes. The technician will also utilize the scan tool to ensure that the live data from the ECT sensor is consistent. If the temperature on a warm engine is unusually low, the technician may check the coolant level or thermostat.
The wiring from the ECM to the ECT sensor will be inspected for cracks, corrosion, contamination, and bent pins. The technician may also use a multimeter to inspect the ECT sensor and check that the proper voltage is given when it is operating.
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Conclusion
In conclusion, the P0118 code can be a headache for vehicle owners, but with the information offered in this article, you can deal with it confidently. Understanding the frequent causes, symptoms, and diagnostic procedures connected with the P0118 code may allow you to fix any difficulties quickly.
FAQs
Should I continue driving with the P0118 code?
If you continue to drive with code P0118, you are putting additional stress on various engine components. Your engine’s cooling and radiator fans run non-stop and wear out prematurely.
What is the cost of replacing an engine coolant temperature sensor?
If your ECT sensor needs to be replaced, the cost ranges typically between $200 and $400. This covers labor costs of $100 to $150 and parts costs of $5 to $250.
Will resetting the check engine light fix the P0118 code?
Resetting the check engine light may temporarily resolve the code. But if the underlying problem persists, the code is likely to reappear. Finding the problem’s primary source is essential.
Can a DIY enthusiast fix the P0118 code themselves?
While DIY enthusiasts can perform some aspects of diagnosing and correcting the P0118 code, the task requires a certain level of mechanical knowledge and the right tools. If you need to know, getting help from a qualified mechanic is best.
How long does it take to diagnose and fix the P0118 code?
In most cases, this takes 5 to 10 minutes once you have the proper wrench in one hand and the sensor in the other. But some are more difficult.
