Skip the auto shop - Our mechanics make house calls

P0527 OBD-II Trouble Code: Fan Speed Sensor Circuit Range or Performance Issue

diagnostic check engine light

Diagnostic Trouble Code (DTC): P0527

P0527 code definition

The P0527 diagnostic trouble code is an indication that there is a range or performance issue with the fan speed sensor circuit.

Related Trouble Codes:

What the P0527 code means

Cooling fans are used to cool the engine temperature and the A/C system, and are controlled by the Powertrain Control Module (PCM). Fan speed sensors are used in vehicles for two purposes. Vehicles with a fan clutch use the fan speed sensor to make sure the fan is running. Vehicles with an electric fan use the fan speed sensor to ensure the fan speed coincides with the fan speed that the Powertrain Control Module (PCM) requires. The Powertrain Control Module (PCM) sets the required fan speed. If the PCM receives a signal from the fan speed sensor indicating a fan speed that does not coincide with the required speed, the P0527 diagnostic trouble code will be stored and the check engine light will come on.

What causes the P0527 code?

  • Faulty engine coolant temperature sensor
  • Engine coolant temperature sensor wires that are frayed, broken, or shorted
  • Engine coolant temperature sensor connectors that are damaged, loose, or corroded
  • Faulty cooling fan motor
  • Faulty cooling fan relay
  • Faulty fan clutch
  • Faulty electric fan
  • Blown fuse
  • Faulty fan speed sensor
  • Fan speed sensor wires that are frayed, broken, or shorted
  • Fan speed sensor connectors that are damaged, loose, or corroded

What are the symptoms of the P0527 code?

How does a mechanic diagnose the P0527 code?

  • Diagnostic trouble codes should be diagnosed in the order that they appear in the powertrain control module (PCM).
  • Use an OBD-II scanner to collect all trouble codes that have been stored by the powertrain control module (PCM) as well as freeze frame data.
  • Inspect the cooling fan assembly wires for frays, breaks, and shorts. Repair and replace as necessary.
  • Inspect the cooling fan assembly connectors for damage, corrosion, and bent pins. Repair and replace as necessary.
  • Check the cooling fan assembly motor for proper operation and power supply. Replace as necessary.
  • Inspect the fan motor relay and fuses. Repair and replace as necessary.
  • Clear all diagnostic trouble codes from Powertrain Control Module (PCM) and operate the vehicle to see if the P0527 diagnostic trouble code comes back.
  • If the P0527 trouble codes come back, inspect the engine coolant temperature sensor for frays, breaks, and shorts. Repair and replace as necessary.
  • Inspect the engine coolant temperature sensor connector for damage, corrosion, and bent pins. Repair and replace as necessary.
  • Clear all diagnostic trouble codes from Powertrain Control Module (PCM) and operate the vehicle to see if the P0527 diagnostic trouble code comes back.
  • If the P0527 trouble code comes back and the vehicle is equipped with a high or low pressure switch for the A/C or fan, this will need to be checked for proper operation. Replace as necessary.
  • Clear all diagnostic trouble codes from Powertrain Control Module (PCM) and operate the vehicle to see if the P0527 diagnostic trouble code comes back.
  • If the P0527 trouble code comes back, inspect the Powertrain Control Module (PCM) wiring and ensure it is working properly. It is rare for this Powertrain Control Module (PCM) to fail but it is possible.

Common mistakes when diagnosing the P0527 code

The most common mistake made when diagnosing the P0527 trouble code is replacing the cooling fan assembly when the problem is a fault relay, damaged wiring, a bad fuse, or damaged wiring. It is important to inspect all components before replacing the cooling fan assembly.

How serious is the P0527 code?

A diagnostic trouble code is normally considered serious when it causes driveability issues or a change in performance. The P0527 diagnostic trouble code causes driveability issues and is considered very serious if the car is overheating. This should be diagnosed and repaired in a timely manner.

What repairs can fix the P0527 code?

Additional comments for consideration regarding the P0527 code

Always complete a thorough inspection of the sensors, fuses, and wiring first. These components are often missed or overlooked during the diagnosis process and leads to multiple failures and the P0527 diagnostic trouble code returning.

Need help with a P0527 code?

YourMechanic offers certified 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How Long Does a Vacuum Brake Booster Check Valve Last?
The braking system on your car requires a lot of pressure. The vacuum booster is one of the main sources of this pressure. This booster will take the pressure that...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...


Related questions

Q: ESP Light and column electrical failures after a sharp turn.

That must have been one hard turn! The ESP light is for the Electronic Stability Program: a system built into your braking system to help prevent the car from going out of control in a sharp turn. You could have...

Q: I have a 2000 dodge ram 2500 and it wont shift gears so I plugged in my code reader to see if it would pull up anycodes vut no pwr

Often, this is caused by a blown fuse in the battery power circuit of the OBD port. It is pin #16 that is B+ on all modern vehicles, such as yours. It appears as though this is fuse #12 on...

Q: Were is the code p0001

Hello. P0001 is the code for an issue with the fuel volume regulator circuit. This code is set off when the computer detects that there is an issue with the electric circuit that goes to the vehicle's fuel pressure regulator....