P0493 OBD-II Trouble Code: Fan Overspeed

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0493 code

P0493 is a diagnostic trouble code (DTC) for "Fan Overspeed". 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 P0493 DIAGNOSTIC Get a fair and transparent estimate upfront

P0493 trouble code definition

A P0493 trouble code is related to a vehicle’s electric cooling fan, or auxiliary fan, that helps the radiator maintain engine coolant temperatures that are within the manufacturer’s parameters. Typically, this fan is also triggered by a vehicle’s HVAC system.

What the P0493 code means

P0493 is an OBD-II generic code for a voltage problem with the electric cooling fan control system in that the signal being sent to the engine computer is incorrect. This either means there is a bad ground or the fan isn’t working.

What causes the P0493 code?

There could be a variety of causes for a P0493, but the most common culprits are:

  • Faulty electric fan motor
  • Faulty electric fan relay
  • Faulty wiring and electrical connectors for the fan
  • Faulty engine coolant temperature sensor
  • Blown electric fan fuse

What are the symptoms of the P0493 code?

Other than A Check Engine Light, there shouldn’t be any severely adverse driving conditions caused by a P0493. However, because the electric cooling fan is used to keep coolant temperatures below an overheating threshold, you may find your vehicle running hotter than normal in conditions such as stop-and-go traffic. The fan is also used frequently to accelerate and maintain cooling of the air conditioning, which may be diminished if the fan is inoperable.

How does a mechanic diagnose the P0493 code?

Your mechanic will start at the easiest first - giving a visual inspection of the fan, its wiring and electrical connectors, associated fuses and the control relay. If nothing looks to need repairs, they will then trigger the fan to power by either jumping the relay, sending 12 volts directly to the fan, or triggering it via the air conditioning. If and under what conditions the fan turns on will help determine the route cause of the problem.

For example, if the fan turns on when the relay is jumped but does not when the air conditioning is triggered, chances are high the relay is bad. If the fan doesn’t turn on at all, the motor is bad and will need to be replaced. The key with a P0493 is first confirming if the fan motor is good and then moving on to the next most common cause, typically the relay.

Common mistakes when diagnosing the P0493 code

Rushing to replace parts like the fan and the relay can become costly, so it really pays to test each component of the vehicle’s electric cooling system.

How serious is the P0493 code?

A P0493 shouldn’t cause serious issues but if you have a code, you’ll want to be on high alert in slow driving conditions with high ambient temperatures. While it’s unlikely that a vehicle will overheat severely without an electric cooling fan, a hot-running engine will not perform as well as normal.

What repairs can fix the P0493 code?

The most common repairs for a P0493 are as follows:

Additional comments for consideration regarding the P0493 code

If you’re dealing with a P0493 on a used vehicle with unknown history, you’ll want to also make sure you’re not dealing with someone else’s shadetree work. Having personally triggered this code by modifying a vehicle’s factory fan to a toggle switch, it can take a lot of research and soldering to make sure it goes away with a modification.

Need help with a P0493 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.

Check Engine Light
trouble codes
P0493

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0493 code.

SCHEDULE P0493 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,328)

Rating Summary
5,857
225
52
35
159
5,857
225
52
35
159

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Toyota Corolla - Check Engine Light is on - New Braunfels, Texas
As always, punctual and professional. He explains the problem thoroughly. I feel confident in his work and knowledge.

Greg

22 years of experience
86 reviews
Greg
22 years of experience
Mazda 3 - Check Engine Light is on - Queen Creek, Arizona
Greg was scheduled for 1:00 but he was able to come earlier and let us know right away. He was very thorough and spent his time going thru the entire car.

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Lincoln Aviator - Check Engine Light is on - San Antonio, Texas
Made call before appt. -courteous-knowledgeable-got part need & did prompt repair after computer check.

Claud

8 years of experience
325 reviews
Claud
8 years of experience
Chevrolet Trax - Check Engine Light is on - Grosse Pointe, Michigan
Very good experience. He arrived on time. Explained what he was going to do. Completed the work and was thorough in what I needed for my next service in plain language vs car jargon. I'm a raving fan of Claud!


More related articles

P0234 OBD-II Trouble Code: Engine Overboost Condition
P0234 code definition Engine Overboost Condition What the P0234 code means P0234 is a generic OBD-II code that is triggered when the...
P0715 OBD-II Trouble Code: Input/Turbine Speed Sensor Circuit Malfunction
P0715 means the transmission will not be able to read the engine RPMs to shift properly causing transmission to shift hard or erratic.
P2442 OBD-II Trouble Code: Secondary Air Injection System Switching Valve Stuck Open Bank 2
P2442 P2442 code definition The P2442 code is a generic powertrain code related to the auxiliary emissions control system. This particular code appears when the bank 2 secondary air injection valve stays open. The P2442 code is also related...

Related questions

A scanner found the code P02B4, what does it mean?

That is an interesting code since your engine only has 4 cylinders. It is possible that the vehicle has the wrong information stored in the computer and is throwing a code for a V-8 engine. I recommend having your computer...

Check engine light on

The code P0442 is for a very small leak in the evaporative system of the fuel tank and its vent system. A leak in the gas cap is the most common cause of this code and the gas cap or...

My truck jumps and shakes when accelerating

It is possible for problems with the ignition system to cause this issue, including spark plugs or ignition coils not firing under load. You should have a scan for trouble codes done to check for codes related to the misfiring....

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