P0483Generic code

P0483 Code: Cooling Fan Rationality Check

The P0483 code indicates that the cooling fan does not have the expected effect when the computer turns it on: the temperature does not come down or the measured speed does not match the command. The usual culprit is a worn fan motor or a clogged radiator.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$50 to $500
Difficulty
Medium
System
Emissions Control
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

On this page

What the P0483 code means

Some computers check that, when the fan is turned on, the coolant temperature stops rising or the fan speed matches the command. If that does not happen, they store the P0483 code.

It can be a fan that spins slowly from wear, a clogged radiator or a control problem.

Keep an eye on the temperature until it is repaired, especially in slow traffic.

The rationality test can also fail for reasons that have nothing to do with the fan. If the thermostat does not open or the water pump is not circulating coolant, the fan works but the temperature does not drop. That is why it pays to check the temperature at the radiator inlet and outlet with an infrared thermometer: a very large difference means the radiator is clogged.

P0483 code symptoms

  • Temperature that climbs in traffic.
  • A/C that cools poorly when stopped.
  • Check engine light on.

Likely causes of the P0483 code

  1. Worn fan motor. It spins slowly and draws too much current.
  2. Clogged radiator, outside (insects, mud) or inside (sediment).
  3. Relay or control module that does not deliver full voltage to the fan.
  4. Thermostat or water pump. If the coolant is not circulating well, the fan cannot bring the temperature down.

How to diagnose the P0483 code step by step

  1. Turn on the fan and watch its speed.
  2. Measure the current.
  3. Inspect the radiator outside and inside.
  4. Measure the radiator inlet and outlet temperature with an infrared thermometer. An excessive difference points to a blockage.

How to fix the P0483 code

  • Replace the fan or its module.
  • Clean the radiator.
  • Clear the codes and verify.

Technical reference data

  • Typical draw: 10 to 30 A.
  • Approximate values only: check the manufacturer data for your engine.

Brand-specific notes

This rationality check is used mostly by two manufacturers.

P0483 on Chrysler

The check is used mainly on Chrysler vehicles.

P0483 on Dodge

The check is used mainly on Dodge vehicles.

Frequently asked questions about P0483

Can I drive with a P0483 code?
With caution, keeping an eye on the temperature gauge. A P0483 code can come with overheating in slow traffic.
What usually fails?
The fan motor. A worn motor spins slowly and draws too much current, so it no longer cools the way the computer expects.
Can it overheat the engine?
Yes, in slow traffic. If the temperature climbs, pull over and let the engine cool before you keep driving.
How much does it cost to fix P0483?
Roughly $50 to $500, depending on whether the radiator just needs cleaning or the fan or its module has to be replaced.
What does the P0483 code mean?
It is a generic OBD2 code that means the cooling fan does not have the expected effect when commanded. The coolant temperature does not drop or the fan speed does not match.
What is the most common cause of P0483?
A worn fan motor, followed by a clogged radiator. A thermostat or water pump problem can also make the fan look like it is not working.

Related codes

Questions about the P0483 code

There are no questions about this code yet. Tell us about your case: vehicle, symptoms and what you have already checked.