P0529 OBD-II Trouble Code: Fan Speed Sensor Circuit Intermittent

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0529 code

P0529 is a diagnostic trouble code (DTC) for "Fan Speed Sensor Circuit Intermittent". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0529 DIAGNOSTIC Get a fair and transparent estimate upfront

P0529 code definition

The P0529 code is a generic powertrain code related to vehicle speed controls and idle control system problems. In this case, the engine control module (ECM) has detected a problem with the fan speed sensor circuit.

Codes related to the P0529 include: * P0480: Cooling Fan 1 Control Circuit * P0481: Cooling Fan 2 Control Circuit * P0482: Cooling Fan 3 Control Circuit * {P0483: Cooling Fan Rationality Check](https://www.yourmechanic.com/article/p0483-obd-ii-trouble-code-cooling-fan-rationality-check-malfunction-by-valerie-johnston) * P0484: Cooling Fan Circuit Over Current * P0485 Cooling Fan Power/Ground Circuit * P0493: Fan Overspeed * P0494: Fan Speed Low * P0495: Fan Speed High * P0526: Fan Speed Sensor Circuit * P0527: Fan Speed Sensor Circuit Range/Performance * P0528: Fan Speed Sensor Circuit No Signal

What the P0529 code means

A P0529 code will appear when the ECM is sent an incorrect voltage signal, in this case an intermittent signal, from the electric cooling fan circuit. If the voltage varies by more than 10% from the manufacturer's preset voltage levels, a P0529 code can be stored.

Some vehicle makes and models have a sensor at the end of the cooling fan, which senses movement when the vehicle is in operation. On a vehicle equipped with an electric fan, this sensor verifies the fan speed detected matches the fan speed commanded by the vehicle’s ECM. The fans usually consist of a primary cooling fan and one or more secondary cooling fans. Most common are single-speed engine cooling fans, but some automakers utilize a fan with multiple speed settings and others utilize an electro-hydraulic cooling fan that uses voltage and hydraulic pressure. It is recommended to check your vehicle service manual for the fan set up and type.

All engine cooling fans are controlled by the ECM, which utilizes the data to calculate fan activation and speed. When the engine reaches a preset temperature (varies by manufacturer and vehicle make/model), the ECM sends a signal to the fan relay. The fan relay has a constant supply of fused voltage and one or more ground signals from the ECM. The cooling fan relay(s) help take the low voltage (or ground) signal and turn it into the signal needed for the cooling fan motor to operate.

What causes the P0529 code?

Several problems may cause a P0529 code including: * Damaged, open, or shorted wiring * Damaged or defective cooling fan motor * Damaged or defective cooling fan relay * Damaged or defective cooling fan speed sensor * Damaged, corroded or loose electrical connectors * Damaged or defective engine coolant temperature sensor * Damaged or defective ECM (rare)

What are the symptoms of the P0529 code?

Symptoms of a P0529 code may include: * The check engine or warning light may illuminate * The vehicle may not display any symptoms other than a stored trouble code * The engine may run hotter than normal * Air conditioner may not work as well, or at all

How does a mechanic diagnose the P0529 code?

A mechanic may use several methods to diagnose a P0529 trouble code, including: * Utilize an OBD-II scanner to check for a stored P0529 trouble code * Visually inspect all wiring and connectors for damage * Utilize a scanner, activate the engine cooling fan, and test for voltage and ground signals * Test system fuses if no voltage is present in engine cooling fan motor * Locate engine fan relay, test voltage readings and compare with manufacturer recommendations * Check and test engine temperature * Test for damaged or defective engine coolant temperature sensor, comparing temperature to manufacturer recommended resistance values * If primary cooling fan isn’t the problem, and secondary cooling fans are present, test secondary cooling fans for damage or faults * Use an RPM to voltage conversion chart to test fan speed

Common mistakes when diagnosing the P0529 code

Often, the cooling fan itself is replaced instead of the wiring, harnesses, or relays. It is recommended to troubleshoot for any electrical issues before replacing the cooling fan.

How serious is the P0529 code?

Because a vehicle’s safe driving operation may be impacted due to faults that store a P0529 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the P0529 code?

Several repairs can fix a P0529 trouble code and include: * Repair any damaged, corroded, shorted, or loose wiring and connectors * Replace damaged or defective engine coolant temperature sensor * Replace damaged or defective cooling fan speed sensor * Repair or replace damaged or defective engine cooling fan motor * Repair or replace damaged or defective engine cooling fan relay * Replace damaged or defective ECM (rare) * Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

Need help with a P0529 code?

YourMechanic offers certified mobile 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.

P0529
trouble codes
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0529 code.

SCHEDULE P0529 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,170

Rating Summary
4,765
197
50
27
131
4,765
197
50
27
131

Fred

16 years of experience
364 reviews
Fred
16 years of experience
Mercedes-Benz E500 - Check Engine Light is on - Conroe, Texas
Fred was very friendly and thorough to get to the root of the issue. Even when he could not find a fault to why my engine light was on, he went above and beyond to make absolutely sure that the concern was minimized. Turns out, all that needed to be done was a reset but his diagnostic to address my issues was very intricate and appreciated.

David

17 years of experience
37 reviews
David
17 years of experience
Chevrolet Cruze - Check Engine Light is on - Aurora, Colorado
David was on time, professionalisms & honest! I would definitely request him again and pass along to friends/family.

John

18 years of experience
18 reviews
John
18 years of experience
Dodge Ram 1500 - Check Engine Light is on - Memphis, Tennessee
Demonstrated good integrity. Advised me when work I thought needed done was unnecessary and was helpful in identifying issues that needed to be addressed

Robert

21 years of experience
17 reviews
Robert
21 years of experience
Chrysler 200 - Check Engine Light is on - Fort Worth, Texas
Robert did a good job working on my car and letting me know what's needed to keep my car driving smoothly.


More related articles

P0230 OBD-II Trouble Code: Fuel Pump Primary Circuit Malfunction
P0230 P0230 code definition Fuel Pump Primary Circuit Malfunction What the P0230 code means P0230 is a generic OBD-II code which indicates that the fuel pump primary circuit has a malfunction of the vehicle power to the fuel pump when...
P0091 OBD-II Trouble Code: Fuel Pressure Regulator 1 Control Circuit Low
P0091 P0091 code definition Fuel Pressure Regulator 1 Control Circuit Low What the P0091 code means P0091 means that the Powertrain Control Module (PCM) has detected fuel pressure that is outside the specification set by the manufacturer. What are...
P0143 OBD-II Trouble Code: O2 Sensor Circuit Low voltage (Bank 1, Sensor 3)
Diagnostic Diagnostic Trouble Code (DTC): P0143 P0143 code definition O2 Sensor Circuit Low voltage (Bank 1 Sensor 3) What the P0143 code means P0143 is the OBD-II generic code indicating that the Engine Control Module (ECM) input from the O2...

Related questions

Check engine light. Code P2004 (Air Intake manifold. Runner control stuck open, bank 1.)

As you know this code is related to the intake manifold and may be caused by several potential issues such as the following: Intake Manifold Runner Binding Or Sticking Faulty Manifold flow valve Manifold flow valve harness is open or...

Check Engine Light

If your vehicle's check engine light illuminates, there is a malfunction that should be diagnosed and repaired. If the check engine light is flashing, that means there is a serious fault, such as cylinder misfiring, that requires immediate repair. Misfiring,...

Why did my Check Engine come on?

Hello. This could be from a gas cap left loose or an air filter not sealed back up correctly. Take the car back to the oil change company and they should be able to scan the car to see if...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com