P0298 OBD-II Trouble Code: Engine Oil Over Temperature Condition

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Cost of diagnosing the P0298 code

P0298 is a diagnostic trouble code (DTC) for "Engine Oil Over Temperature Condition". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

P0298 code definition

The P0298 code is stored when the PCM detects that the engine is or has recently overheated, according to a signal from the engine oil temperature sensor.

What the P0298 code means

During engine operation, the engine oil temperature sensor is used by the PCM to ensure that the engine is operating without getting too hot. Operating a vehicle when it is overheating can lead to major engine failure, so this is a very important function of the PCM. If the engine oil temperature sensor indicates that the engine oil is too hot (and therefore, the engine is too hot), the PCM will store the P0298 code.

What causes the P0298 code?

If an engine is overheating, the most likely cause is a low engine coolant level. However, faulty cooling fans, cracked cylinder heads, a faulty thermostat, or a faulty radiator can all cause an engine to overheat.

If the code was stored when the engine had not overheated, it could be due to another cause, such as:

  • Faulty coolant temperature sensor
  • Open or shorted electrical components
  • Faulty PCM

These possible causes are very rare, and none of these parts should be replaced without first testing for the most likely causes leading to an engine overheating.

What are the symptoms of the P0298 code?

There may be no symptoms at all beyond the illumination of the Check Engine Light; however, in many cases, there will be smoke coming from the engine; the engine may make “burping” or “ticking” noises; or the engine may be disabled entirely if the vehicle model includes certain safety features.

How does a mechanic diagnose the P0298 code?

After an OBD-II scanner detects the P0298 code, the mechanic should begin with a chemical block test. This test can help provide a comparison reading, so that after the mechanic replaces any components (such as the thermostat, water pump, radiator, etc.), the reading can be checked again to ensure that the repair fixed the issue.

After this data is gathered, the mechanic should begin using a cooling system pressure tester to find a coolant leak. If this coolant leak is not found, then the mechanic should continue testing other components, such as the thermostat, cooling fan, or radiator, until they find the component that is not giving a voltage reading within the manufacturer’s specifications.

After any repair is attempted, the mechanic should be sure to clear the code from the PCM and retest the system, to be sure that the repair actually fixed the issue.

Common mistakes when diagnosing the P0298 code

Most of the time, common misdiagnoses with the P0298 code come from replacing parts without performing a thorough system check. For example: many technicians will replace leaking cooling system components, instead of checking the entire cooling system for issues. While these parts likely needed the replacement, a full system check can reveal underlying issues that will ruin the replacement components the same way they did the leaking components.

How serious is the P0298 code?

If the P0298 code is being detected, the vehicle must be repaired as soon as possible. This code represents a very serious issue that can lead to unsafe driving conditions, or to major engine failure if left unchecked.

What repairs can fix the P0298 code?

There are many steps that a technician will likely have to follow in order to fully address a P0298 code detection. They include:

Need help with a P0298 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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Nazareth

26 years of experience
168 reviews
Nazareth
26 years of experience
Mercedes-Benz CLA250 - Check Engine Light is on - Los Angeles, California
Polite and very professional! Nazareth quickly identified my car was suffering from low voltage issues and the battery was the problem. The reader was showing 8 volts hence why my car didn’t receive enough power to start, it needed 12v. My battery was 4 years old and never been changed. Thank you Nazareth!

Cornelius

17 years of experience
78 reviews
Cornelius
17 years of experience
Chevrolet Cobalt - Check Engine Light is on - Peachtree City, Georgia
He was very helpful with explaining what could lead to my check engine light being on. And helping clear my engine light.

Marco

28 years of experience
78 reviews
Marco
28 years of experience
Nissan Maxima - Check Engine Light is on - Highland, California
Marco did a great job of finding the source of the problem and his recommendations were greatly appreciated.

Juan

8 years of experience
128 reviews
Juan
8 years of experience
Chevrolet Tahoe - Check Engine Light is on - Altamonte Springs, Florida
Juan was on time for both appointments. He was knowledgeable and polite and I will most definitely be requesting him for my next steps based on the quote he provided me for other issues I need to address. Excellent customer service and top notch repair work!


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