Description of the P0495 fault code.
OBD2 Error Codes

P0495 Cooling Fan Motor High Speed

26.05.2022 /

P0495 – OBD-II Trouble Code Technical Description

Trouble code P0495 indicates that the vehicle's PCM has detected the cooling fan motor speed is too high.

What does the fault code mean P0495?

Trouble code P0495 indicates that the PCM (engine control module) has detected too high voltage on the cooling fan motor control circuit. The PCM receives input from the cooling fan control circuit in the form of voltage readings and determines whether the engine temperature is normal and whether the air conditioning system is operating properly. If the PCM detects that the cooling fan control circuit voltage is too high (within 10% of manufacturer specifications), P0495 will appear.

Fault code P0495.

Possible reasons

Some possible reasons for the P0495 trouble code:

  • Cooling fan motor malfunction.
  • Incorrect connection or break in the electrical fan control circuit.
  • Problems with the PCM (engine control module) or other engine management system components.
  • Engine overheating, which can lead to increased voltage in the cooling fan control circuit.

What are the symptoms of a fault code? P0495?

Symptoms for DTC P0495 may include the following:

  • The Check Engine indicator appears on the dashboard.
  • Increased coolant temperature.
  • Overheating of the engine.
  • The cooling fan may not work properly or may not turn on at all.
  • Poor engine performance.
  • There may be problems with the operation of the air conditioning system.

How to diagnose a fault code P0495?

When diagnosing DTC P0495, follow these steps:

  1. Visual condition check: Inspect the electrical connections and wires associated with the cooling fan for damage, corrosion, or breaks.
  2. Checking electrical connections: Use a multimeter to check the voltage at the cooling fan connections. Make sure the voltage meets the manufacturer's specifications.
  3. Checking relays and fuses: Check the condition of the relays and fuses that control the operation of the cooling fan. Make sure they are functioning correctly.
  4. Diagnostics using an OBD-II scanner: Use an OBD-II scanner to read additional information about the P0495 code and any other trouble codes. This may provide additional clues about the problem.
  5. Checking the engine temperature sensor: Check the operation of the engine temperature sensor, as improper operation can lead to the P0495 code.
  6. Fan check: Check the cooling fan itself to ensure it is working properly. Make sure it turns on and runs when the engine reaches a certain temperature.
  7. Check PCM: If there are no other problems, the PCM itself may need to be checked for faults.

In case of difficulties or lack of experience, it is recommended to contact a qualified auto mechanic or service center for more detailed diagnostics and troubleshooting.

Diagnostic errors

When diagnosing DTC P0495, the following errors may occur:

  • Skipping Inspection of Electrical Connections: All electrical connections and wires must be carefully checked for damage, corrosion or breaks. Skipping this step may result in an incorrect diagnosis.
  • Incorrect interpretation of OBD-II scanner data: Sometimes the data obtained from the OBD-II scanner may be misinterpreted or misinterpreted. This may lead to incorrect conclusions about the causes of the malfunction.
  • Insufficient check of engine temperature sensor: If the problem is with the engine temperature sensor, not testing it correctly or ignoring this component may result in a misdiagnosis.
  • Skipping relay and fuse checks: Incorrect operation of the relays or fuses that control the cooling fan can also lead to erroneous outputs.
  • Ignoring factors affecting fan operation: There are other factors to consider, such as the condition of the radiator, problems with the air conditioning system, etc., that may affect the operation of the cooling fan.

It is important to carry out comprehensive diagnostics, taking into account all possible factors, in order to avoid errors and correctly determine the cause of the malfunction.

How serious is the fault code? P0495?

Trouble code P0495 indicates a voltage problem in the cooling fan motor control circuit. While this may not pose an immediate risk to driving safety, if the problem is not addressed, it may cause the engine to overheat. Therefore, it is recommended to immediately contact a specialist for diagnosis and repair. It is not recommended to ignore this code as overheating of the engine can cause serious damage and costly repairs.

What repair will help eliminate the code? P0495?

Troubleshooting DTC P0495 typically involves the following repair steps:

  1. Replace Parts: If the problem is with the fan motor or other cooling system components, you will need to replace the damaged or faulty parts.
  2. Electrical Circuit Repair: If the problem is with the fan control electrical circuit, the electrical wires, connectors, or relays may need to be repaired or replaced.
  3. Checking the Coolant: It is also important to ensure that the coolant level and condition are correct, as insufficient cooling can cause the engine to overheat.
  4. Re-Diagnosis: After repairs are completed, a re-diagnosis should be performed to ensure that the problem has been completely resolved and that the P0495 code no longer appears.

It is recommended that these steps be performed under the guidance of a qualified auto mechanic or electrical technician.

P0495 Fan Speed High 🟢 Trouble Code Symptoms Causes Solutions

P0495 – Brand-specific information

Trouble code P0495 relates to the cooling system and can apply to various makes of cars, several interpretations of this code for some well-known brands:


Trouble code P0495 can have different interpretations depending on the specific make and model of the vehicle. Here are some transcripts for different brands:

These are just a few examples of how the P0495 code can be interpreted for various makes of vehicles. For accurate interpretation and resolution of the problem, it is recommended that you contact a dealer or a certified auto mechanic who specializes in your specific brand of vehicle.

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