P0529 Fan Speed ​​Sensor Circuit Malfunction
OBD2 Error Codes

P0529 Fan Speed ​​Sensor Circuit Malfunction

P0529 – OBD-II Trouble Code Technical Description

Trouble code P0529 is a general trouble code that indicates that the engine control module (ECM) has detected a malfunction in the cooling fan speed sensor circuit.

What does the fault code mean P0529?

Code P0529 is a generic OBD-II transmission code that is associated with the vehicle speed control system and idle speed control system. This code indicates a problem with the fan speed sensor signal wire. It can manifest itself differently in different makes and models of cars, but is usually associated with an erroneous or intermittent signal from this sensor. If your vehicle's code P0529 appears, it may indicate a problem with the cooling fan control system and requires diagnosis and repair.

Possible reasons

Code P0529 can occur for several reasons, including:

  • Damaged, open or shorted wiring.
  • Defective cooling fan motor.
  • Defective cooling fan relay.
  • Faulty cooling fan speed sensor.
  • Damaged, oxidized or poorly connected electrical connectors.
  • Defective engine coolant temperature sensor.
  • Rarely, a faulty PCM/ECM module.

When a P0529 code appears, diagnostics are required to identify the specific cause and then make appropriate repairs or replace parts.

What are the symptoms of a fault code? P0529?

Symptoms of a P0529 code may include:

  • The malfunction indicator light (also known as the Check Engine Light) comes on.
  • Your car may be overheating or running hotter than usual.

How to diagnose a fault code P0529?

To diagnose the P0529 code, a mechanic can use the following methods:

  • Use an OBD-II scanner to check for a stored DTC P0529.
  • Visually check all wiring and connectors for damage.
  • Use a scan tool, activate the engine cooling fan and check the voltage and ground signals.
  • Check the system fuses if there is no voltage to the engine cooling fan motor.
  • Locate the motor relay, read the voltage reading and compare it to the manufacturer's recommendations.
  • Check and verify the engine temperature as well as the engine coolant temperature, comparing it to the manufacturer's recommended resistance values.
  • If the primary cooling fan is not the problem and the secondary cooling fans are present, check them for damage or malfunction.
  • Use RPM to convert the graph to voltage to test the fan speed.

These methods will help identify and eliminate the causes of the P0529 code.

Diagnostic errors


One common mistake when diagnosing a P0529 code is to replace the cooling fan itself without first checking the system's electrical components. Instead of replacing the fan right away, it is recommended to take a more systematic approach and troubleshoot any electrical problems that may have caused this code.

Often the P0529 code appears due to damaged or broken wiring, corroded connectors, a poor contact relay, or a faulty fan speed sensor. Therefore, before replacing the fan, you should:

  1. Visually Inspect Wiring and Connectors: Inspect the wiring, connections, and connectors in the cooling system, especially those associated with the fan. Wiring may be damaged, broken, or corroded, which may cause problems with signal transmission.
  2. Check Relay Condition: Cooling fan relays, if your system has them, can cause electrical problems. Check the relays for corrosion and make sure they are connected and functioning correctly.
  3. Check Fan Speed ​​Sensor: The cooling fan speed sensor may be faulty. Check its condition and connection.
  4. Diagnose with a scanner: Use an OBD-II scanner to check for stored P0529 code and additional data that may help identify the specific cause. This may include information about fan speed, motor temperature, and other parameters.

Fixing electrical problems, if any, may solve the problem and you won't need to replace the cooling fan. This will save you money and time on unnecessary part replacements.

How serious is the fault code? P0529?

How serious is the P0529 code?

At this time, the P0529 code is not extremely critical, and this gives you some time to respond. However, it should not be neglected. It is recommended that you pay close attention to this error and resolve it as soon as possible before it can lead to more serious problems.

Each vehicle is unique, and available features may vary depending on the make, model, year, and features of your specific vehicle. To more accurately determine which functions are supported by your car, it is recommended to connect the scanner to the OBD2 port, contact the corresponding application and carry out an initial diagnosis. This way you can find out what actions are required specifically for your car.

It is important to note that the information provided on this website is for informational purposes only and the responsibility for its use lies with the vehicle owner. Fixing the problem that caused the P0529 code is best left to professionals to avoid additional problems in the future.

What repair will help eliminate the code? P0529?

To resolve the P0529 code and related problems, the following repair measures are required:

  1. Wiring and Harness Inspection: Inspect the wiring, connections, and connectors that are associated with the cooling fan speed sensor. Make sure they are secure and free of damage, corrosion or breaks.
  2. Fan speed sensor diagnostics: Check the fan speed sensor itself. Make sure it is securely attached to the end of the fan and has no loose connections.
  3. Checking the cooling fan relay: Check the condition and functionality of the relays that control the cooling fans. Replace them if they are damaged.
  4. Engine Control Module (ECM)/PCM Diagnosis: If necessary, check the ECM/PCM for faults. This is rare, but if the module is faulty, it will also need to be replaced.
  5. Replacing the Fan Speed ​​Sensor: If all the previous steps do not resolve the problem, then the fan speed sensor itself may be faulty. Replace it to clear P0529.
  6. Checking the engine temperature: Check the engine coolant temperature. Compare it with the recommended resistance values ​​for this sensor. Replace the sensor if it does not meet the standards.
  7. Checking the Cooling Fans: If your vehicle has secondary cooling fans, make sure they are working properly and not damaged.
  8. Additional diagnostics: Sometimes faults can be related to deeper problems, such as problems with the cooling system. In this case, additional diagnostics may be required to identify the root cause.

It is important to note that diagnosing and repairing a P0529 code may require specific skills and equipment. If you are unsure of your abilities, it is best to contact a professional mechanic or auto repair shop for an accurate diagnosis and repair.

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