P0494 OBD-II Trouble Code: Fan Speed Low

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0494 code

P0494 is a diagnostic trouble code (DTC) for "Fan Speed Low". 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 P0494 DIAGNOSTIC Get a fair and transparent estimate upfront

Diagnostic Trouble Code (DTC): P0494

P0494 code definition

If the PCM has detected a voltage reading that is too low from the electric cooling fan control circuit, the P0494 code will be stored.

What the P0494 code means

The P0494 code relates to the engine cooling and air conditioner systems. In order ensure that the engine temperature remains at the right level, and that the air conditioner is operating correctly, the PCM gathers data from the circuitry in the cooling fan control system. If this data is more than 10% lower than the voltage specified by the manufacturer for the current driving conditions, then the PCM will store the P0494 code.

What causes the P0494 code?

Most of the time, a bad cooling fan motor, or a faulty cooling fan relay, are to blame for this code. However, there are some less-common causes that should be considered, such as:

What are the symptoms of the P0494 code?

In most cases, the illuminated Check Engine Light will be the only observable symptom. Some vehicles may overheat, and the air conditioner may not work as efficiently.

How does a mechanic diagnose the P0494 code?

After verifying the code with an OBD-II scanner, the mechanic should begin with a visual inspection of all wiring and other electrical components, as well as vacuum lines and hoses. Any simple electrical issues, such as loose or shorted elements, should be repaired.

After this, or any, repair, it is important to clear the code and retest the system. If the code returns, then the mechanic must continue by checking the voltage of the primary cooling fan motor. The next step is to check the voltage readings of the engine cooling fan relay. If either of these parts are not meeting the manufacturer’s specifications, they must be replaced.

The mechanic should continue in this manner, diagnosing and retesting the system after each possible diagnosis, until the cause is found.

Common mistakes when diagnosing the P0494 code

The most common mistake when diagnosing and repairing this code is to replace a cooling fan motor without performing a thorough diagnostic procedure of the entire system. For example, cooling fan relays are frequently recalled, and may therefore be the true issue. It is important to diagnose all possible problems before replacing any major parts.

How serious is the P0494 code?

If the P0494 code is stored in the PCM, it represents a serious issue that should be repaired immediately. Although no major symptoms are usually observed, the inability to measure and control the cooling system will eventually lead to larger and more expensive repairs. It is important to have this issue fixed as soon as the code is detected.

What repairs can fix the P0494 code?

There are a few ways that a technician can address a P0494 code detection. They include:

Need help with a P0494 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.

trouble codes
Cooling System
Check Engine Light
fans

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0494 code.

SCHEDULE P0494 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

5,189

Rating Summary
4,783
198
50
27
131
4,783
198
50
27
131

Kenneth

7 years of experience
6 reviews
Kenneth
7 years of experience
Kia Sedona - Check Engine Light is on - Pittsburgh, Pennsylvania
Kenneth is clearly a first-rate mechanic. He thoroughly inspected our vehicle and found that the engine light was on because of a crack in the filler neck hose.

Rigoberto

10 years of experience
731 reviews
Rigoberto
10 years of experience
Jeep Wrangler - Check Engine Light is on - Arlington Heights, Illinois
This is my first time using Your Mechanic. Rigoberto arrived earlier than the appointment time. He was very knowledgeable, helpful and answered all my questions.

Jason

14 years of experience
48 reviews
Jason
14 years of experience
Hyundai Sonata - Check Engine Light is on - Bellerose, New York
Jason was a pleasure to work with. He went above and beyond on my car and it was very much appreciated. Jason worked on my car for 4 days and he was very professional and punctual. He educated me on the health of my car. He was fair and flexible with his quotes. I highly recommend Jason and will be utilizing his services again.

Alex

5 years of experience
45 reviews
Alex
5 years of experience
Ford F-150 - Check Engine Light is on - Alameda, California
show up on time, great guy, very knowledge on what he's doing, would recommend his work to everyone, keep up the good work thank you.


More related articles

Related questions

oil pressure drops,replaced oil pump, ran for a 2 months, and again pressure drops after afew minutes.

Engine oil pressure may go lower after an engine gets warm. You should have the oil pressure checked with a gauge tester to verify the oil pressure is within specification. If it falls to below specification, then you should replace...

I drives Toyota corella S 2005 model.My check engine light is constantly on and I noiced there i

If the spark plugs have not been changed in 85K miles, then I suggest putting in new spark plugs. Also, you would need to put a fuel injection cleaner in the fuel tank to help clean out the fuel system...

Brakes went out in car

Hello, since you have a brake fluid leak, this needs to be repaired to make the car safe to drive. I would recommend not driving the car until this is fixed. You state that you hear something dragging, this should...

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