P0693 Cooling Fan 2 Relay Control Circuit Low

P0693 – OBD-II Trouble Code Technical Description

Trouble code P0693 is a general trouble code that indicates the cooling fan 2 motor control circuit voltage is too low.

What does the fault code mean P0693?

Trouble code P0693 indicates that the cooling fan 2 motor control circuit voltage is too low. This means that the vehicle's powertrain control module (PCM) has detected that the voltage in the circuit that controls the cooling fan motor 2 is below the normal value specified in the manufacturer's specifications.

Possible reasons

Some of the possible causes of the P0693 trouble code are:

• Faulty fan motor: The fan motor may be faulty due to a short circuit, open circuit or other damage.
• Fan relay problems: A faulty relay that controls the fan motor can cause low voltage on the control circuit.
• Fuse problems: Damaged or blown fuses associated with the cooling fan control circuit can cause low voltage.
• Problems with wiring and connections: Breaks, corrosion or poor connections in the electrical circuit can cause low voltage.
• Malfunctions in the charging system: Problems with the alternator or battery can cause insufficient voltage in the vehicle's electrical system, including the cooling fan control circuit.
• Problems with the temperature sensor: A faulty engine temperature sensor may provide incorrect data, which may cause the cooling fan control circuit to become low.
• PCM malfunctions: Faults in the engine control module (PCM) itself, which controls the cooling fan, can also cause P0693.

To accurately determine the cause of error P0693, it is recommended to carry out diagnostics using specialized equipment or contact a qualified auto mechanic.

What are the symptoms of a fault code? P0693?

Symptoms for a P0693 trouble code can vary depending on the specific problem and vehicle model, but some typical symptoms that may occur include:

• Engine overheating: Engine overheating can be one of the most noticeable symptoms, as low cooling fan speed may not cool the engine enough.
• Increased coolant temperature: If you see the coolant temperature rising above normal on your dashboard, this may indicate a cooling problem.
• Frequent overheating or shutdown of the air conditioner: If your air conditioner intermittently shuts down or operates less efficiently due to overheating, this may also indicate a cooling problem.
• An error code appears on the instrument panel: If your vehicle is equipped with an OBD-II diagnostic system, the occurrence of trouble code P0693 may be displayed on the instrument panel.
• Unusual sounds or vibrations: In some cases, cooling fan malfunctions may manifest as unusual sounds or vibrations due to its unstable operation.

These symptoms can occur individually or in combination with each other.

How to diagnose a fault code P0693?

To diagnose DTC P0693, you can follow these steps:

1. Visual inspection: Check the electrical wiring, connectors and connections associated with the fan motor and control module. Look for damage, corrosion, or broken wires.
2. Checking the fan motor: Check the operation of the fan motor by supplying voltage directly from the battery. Make sure the motor is functioning properly.
3. Checking relays and fuses: Check the condition of the relay that controls the fan motor and the fuses associated with the cooling system. Make sure the relay activates when needed and that the fuses are intact.
4. Using the Diagnostic Scanner: Connect the vehicle to an OBD-II diagnostic scanner to read DTC P0693 and other related codes, and check the cooling system performance parameters in real time.
5. Temperature sensor test: Check the operation of the coolant temperature sensor. Make sure it is reporting correct engine temperature data.
6. Checking the charging system: Check the condition of the alternator and battery to ensure that the charging system is providing sufficient voltage for the cooling system to operate properly.
7. Additional tests: Depending on the diagnostic results, additional tests may be required, such as checking for corrosion or open circuits, and checking the functionality of the PCM.
8. Contact a specialist: If the cause of the malfunction cannot be determined or eliminated independently, it is recommended that you contact a qualified auto mechanic or auto repair shop for further diagnosis and repair.

Conducting a thorough diagnosis will help identify the cause of the P0693 code and resolve the problem.

Diagnostic errors

When diagnosing DTC P0693, the following errors may occur:

• Incorrect interpretation of code: One common mistake is misinterpreting the P0693 code. This can lead to incorrect diagnosis and repair of the problem if the mechanic focuses on the wrong components or systems.
• Skipping important diagnostic steps: A mechanic may skip important diagnostic steps such as checking electrical wiring, relays, fuses, and other cooling system components, which may result in missing the true cause of the error.
• Insufficient electrical circuit check: Electrical problems, such as broken wires or corroded connectors, may be missed during diagnosis, which can make it difficult to detect and fix the problem.
• Insufficient fan motor check: If the fan motor is not properly tested for functionality, it may lead to an incorrect conclusion about its condition.
• Malfunctions not related to the cooling system: Sometimes the cause of the P0693 code may be related to other vehicle components, such as the charging system or temperature sensor. It is necessary to ensure that all possible sources of the problem are taken into account when diagnosing.
• Insufficient use of diagnostic equipment: Failure to use specialized diagnostic equipment or use it incorrectly may result in incomplete or inaccurate diagnostic results.

To prevent these errors, it is important to follow a structured diagnostic procedure, carefully check each component and perform all necessary tests, and it is also useful to use diagnostic equipment.

How serious is the fault code? P0693?

Trouble code P0693 indicating cooling fan 2 motor control circuit voltage too low can be serious, especially if not corrected in time, there are several reasons why this code can be considered serious:

• Engine overheating: Insufficient engine cooling due to low voltage in the cooling fan control circuit may cause the engine to overheat. This can cause serious engine damage and costly repairs.
• Potential breakdowns: If the cooling problem is not corrected, it can cause damage to other vehicle systems such as the transmission, seals and gaskets.
• Performance limitation: Some vehicles may automatically limit engine performance to prevent engine overheating. This may result in poor vehicle performance and handling.
• Road safety: An overheated engine can cause your vehicle to stall on the road, which can create a dangerous situation for you and other road users.

Based on these factors, code P0693 should be taken seriously. It is important to take steps to diagnose and correct this problem as soon as possible to prevent serious engine damage and ensure safety on the road.

What repair will help eliminate the code? P0693?

Troubleshooting DTC P0693, which indicates the cooling fan 2 motor control circuit voltage is too low, may require the following repairs:

1. Replacing the fan motor: If the fan motor is faulty, it should be replaced with a new, working one.
2. Checking and replacing the fan relay: A faulty relay may cause low voltage in the control circuit. Check its functionality and, if necessary, replace it with a new one.
3. Checking and replacing fuses: Check the condition of the fuses associated with the cooling system. If any of them is damaged or burnt out, replace it with a new one.
4. Checking and repairing the electrical circuit: Carry out a thorough check of the electrical circuit, including wires, connectors and connections. Repair any shorts, breaks or corrosion.
5. Checking the charging system: Check the condition of the alternator and battery to ensure that the charging system is providing sufficient voltage for the cooling system to operate properly.
6. Temperature sensor test: Check the operation of the coolant temperature sensor. Make sure it is reporting correct engine temperature data.
7. PCM Software Update (if needed)Note: In rare cases, a PCM software update may be required to resolve cooling system control problems.
8. Check and replace PCM (if necessary): If the PCM itself is faulty and cannot properly control the cooling system, it may need to be replaced.

After repair work is completed, it is recommended that the cooling system be tested and diagnosed using a diagnostic scanner to ensure that the problem has been successfully resolved and the P0693 trouble code no longer returns. If the cause of the malfunction cannot be determined or corrected independently, it is recommended that you contact a qualified auto mechanic or service center for further diagnosis and repair.

What is P0693 Engine Code [Quick Guide]

P0693 – Brand-specific information

The specific meaning of the P0693 trouble code may vary depending on the vehicle manufacturer, but examples are for several common brands:

• Ford:
  • Description: The voltage in the cooling system fan 2 motor control circuit is too low.
• Chevrolet / GMC:
  • Description: The cooling fan motor control circuit is low.
• Toyota:
  • Description: Low voltage in the cooling fan motor control circuit.
• Volkswagen/Audi:
  • Description: There is a voltage problem in the cooling fan motor control circuit.
• Honda:
  • Description: The cooling fan motor control circuit voltage is too low.
• BMW:
  • Description: Low voltage in the cooling fan motor control circuit.
• Mercedes-Benz:
  • Description: There is a voltage problem in the cooling fan motor control circuit.

These are general descriptions, and the actual meaning of the P0693 code may vary depending on the specific model and year of the vehicle. To accurately diagnose and correct the problem, it is recommended that you consult the service manual for your specific vehicle brand or contact a qualified auto mechanic.