Diagnostic Trouble Code (DTC): P0495
P0495 code definition
The P0495 code is stored when the PCM has detected a voltage reading that is too high from the electric cooling fan control circuit.
What the P0495 code means
In order ensure that the engine temperature remains at the right level, and that the air conditioner system works when turned on, the PCM gathers data from the cooling fan control system circuit. If this data is more than 10% higher than the voltage specified by the manufacturer for the current driving conditions, then the PCM will store the P0495 code.
What causes the P0495 code?
The most common causes behind the P0495 code include a bad cooling fan motor, and a faulty cooling fan relay; however, there are some less-common causes that should be considered, such as:
- A faulty cooling fan clutch
- A faulty cooling fan control unit
- Loose or corroded electrical connectors
- A faulty engine coolant temperature sensor
- Open or shorted electrical wiring (which may or may not be accompanied by blown fuses)
What are the symptoms of the P0495 code?
The Check Engine Light will be illuminated, and may be the only observable symptom. Some engines may overheat, and the air conditioner may not work as efficiently as it typically does.
How does a mechanic diagnose the P0495 code?
After verifying the code with an OBD-II scanner, the mechanic should begin with a visual inspection of all wiring and other electrical components, as well as vacuum lines and hoses. Any simple electrical issues, such as loose or shorted elements, should be repaired or replaced as necessary.
After this, or any repair, it is important to clear the code from the PCM and retest the system. If the code returns, then the mechanic should move on to manually testing the voltage of the primary cooling fan motor. The next step is to check the voltage readings of the engine cooling fan relay. If either of these parts are not meeting the manufacturer’s specifications, they must be replaced.
Common mistakes when diagnosing the P0495 code
The most common mistake when diagnosing and repairing this code is to replace a cooling fan motor without performing a thorough diagnostic procedure of the entire system. One part that is often recalled is the cooling fan relay and may therefore be the true issue. It is important to diagnose all possible problems before replacing any major parts.
How serious is the P0495 code?
If the P0495 code is stored in the PCM, it represents a serious issue that should be repaired immediately. Although no major symptoms are usually observed, the inability to measure and control the cooling system will eventually lead to larger and more expensive repairs. Vehicle owners should have this code addressed as soon as possible.
What repairs can fix the P0495 code?
There are a few ways that a technician can address a P0495 code detection. They include:
- Replace a bad cooling fan motor
- Replace a bad cooling fan relay
- Repair any open or shorted electrical wiring
- Replace a faulty cooling fan clutch
- Replace a faulty cooling fan control unit
- Repair any loose or corroded electrical connectors
- Replace a faulty engine coolant temperature sensor
Need help with a P0495 code?
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