P0480 Mercedes-Benz Code - Cooling Fan 1 Control Circuit Malfunction
Quick Answer
The electric cooling fan is controlled by the Powertrain Control Module (PCM) through the cooling fan relay based on inputs from the following components: - The engine coolant temperature (ECT) sensor - The intake air temperature (IAT) sensor - The A/C selector switch - The A/C refrigerant pressure sensor - The vehicle speed sensor (VSS) The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. Common causes include Faulty fan control relay, Fan control relay harness is open or shorted, Fan control relay circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0480 Mercedes-Benz indicates Cooling Fan 1 Control Circuit Malfunction.
- Common causes
- Common causes include Faulty fan control relay, Fan control relay harness is open or shorted, Fan control relay circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0480 Mercedes-Benz Description
- The engine coolant temperature (ECT) sensor
- The intake air temperature (IAT) sensor
- The A/C selector switch
- The A/C refrigerant pressure sensor
- The vehicle speed sensor (VSS)
The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. The cooling fan relay will be commanded ON when the following conditions are met:
- The engine coolant temperature reaches 106°C (223°F) or more.
- The A/C clutch requested.
- The vehicle speed is less than 38 MPH.
The cooling fan relay will be commanded ON regardless of vehicle speed when the following conditions are met:
- The engine coolant temperature is 151°C (304°F) or more.
- The A/C refrigerant pressure is high.
The cooling fan may be commanded ON when the engine is not running under a fan run-on conditions described in the electric cooling fan general description portion of the service manual.
What are the Possible Causes of the DTC P0480 Mercedes-Benz?
- Faulty fan control relay
- Fan control relay harness is open or shorted
- Fan control relay circuit poor electrical connection
- Faulty cooling fan 1
- Fan cooling fan harness is open or shorted
- Fan cooling fan circuit poor electrical connection
How to Fix the DTC P0480 Mercedes-Benz?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0480 Mercedes-Benz code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0480 Mercedes-Benz code?
Need more information on how to fix the P0480 Mercedes-Benz code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0480 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0480 Mercedes-Benz Code
1. What are the common symptoms of OBDII code P0480 in a Mercedes-Benz related to Cooling Fan 1 Control Circuit Malfunction?
The common symptoms may include overheating of the engine, the cooling fan running constantly, or the cooling fan not running at all.
2. What are some possible causes of OBDII code P0480 in a Mercedes-Benz?
Potential causes include a faulty cooling fan motor, a malfunctioning cooling fan relay, a damaged wiring harness, or a problem with the engine coolant temperature sensor.
3. How can I diagnose the Cooling Fan 1 Control Circuit Malfunction in my Mercedes-Benz with OBDII code P0480?
You can start by checking the cooling fan fuse, testing the cooling fan motor, inspecting the relay, and examining the wiring for any visible damage or loose connections.
4. Can I continue driving my Mercedes-Benz with OBDII code P0480 present?
It is not recommended to drive your vehicle with this code as it can lead to engine overheating and potential damage. It's best to address the issue promptly.
5. How can I repair OBDII code P0480 in my Mercedes-Benz?
Repairing the issue may involve replacing the cooling fan motor, the cooling fan relay, repairing the wiring harness, or addressing any underlying issues that caused the malfunction.
6. Is it safe to reset the OBDII code P0480 in my Mercedes-Benz and see if it comes back?
While you can reset the code to see if it returns, it's essential to address the root cause of the issue to prevent potential engine damage and ensure the proper functioning of the cooling system.
7. Will OBDII code P0480 cause any long-term damage to my Mercedes-Benz if left unresolved?
Leaving this issue unresolved can lead to engine overheating, which can cause severe damage to engine components. It's crucial to address the problem promptly to prevent any long-term damage.
8. Can a DIY enthusiast repair OBDII code P0480 in a Mercedes-Benz?
Depending on your skill level and knowledge of automotive repair, you may be able to address some aspects of the issue yourself, such as checking fuses or relays. However, complex repairs may require professional assistance.
9. How long does it typically take to repair OBDII code P0480 in a Mercedes-Benz?
The repair time can vary depending on the exact cause of the issue and the availability of parts. A straightforward repair may take a few hours, while more complex issues could take longer.
10. Are there any preventative maintenance tips to avoid OBDII code P0480 in a Mercedes-Benz?
Regularly checking the cooling system components, maintaining proper coolant levels, and addressing any cooling system issues promptly can help prevent the occurrence of OBDII code P0480 in your Mercedes-Benz.
Discuss the causes and fixes for P0480 Mercedes-Benz OBDII Code
Code P0480 Mercedes-Benz comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
