AutoCodes – Infiniti – P1900 Infiniti

P1900 Infiniti Code - Radiator Cooling Fan Motor Control

Quick Answer

The Cooling Fan Motor(s) is controlled by the Engine Control Module (ECM) through the cooling fan relay(s). Common causes include Faulty Radiator Cooling Fan Motor Relay, Faulty Radiator Cooling Fan Motor, Radiator Cooling Fan Motor harness is open or shorted. 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: P1900 Infiniti indicates Radiator Cooling Fan Motor Control.
Common causes: Common causes include Faulty Radiator Cooling Fan Motor Relay, Faulty Radiator Cooling Fan Motor, Radiator Cooling Fan Motor harness is open or shorted.
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.

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Code Popularity 2,155

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1900 Infiniti Description

The Cooling Fan Motor(s) is controlled by the Engine Control Module (ECM) through the cooling fan relay(s). The Engine Control Module will compensate idle speed when the cooling fan is on. The Diagnostic Trouble Code (DTC) will set when the Radiator Cooling Fan Motor (s) is not to factory specifications.

OBDII Code P1900 Infiniti - Radiator Cooling Fan Motor Control - AutoCodes.com — P1900 Infiniti Code - Radiator Cooling Fan Motor Control

What does this mean?

What are the Possible Causes of the DTC P1900 Infiniti?

Faulty Radiator Cooling Fan Motor Relay
Faulty Radiator Cooling Fan Motor
Radiator Cooling Fan Motor harness is open or shorted
Radiator Cooling Fan Motor circuit poor electrical connection

How to Fix the DTC P1900 Infiniti?

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 P1900 Infiniti 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 P1900 Infiniti code?

Need more information on how to fix the P1900 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1900 Infiniti Code

1. What does the OBDII code P1900 mean on an Infiniti?

The P1900 code indicates a problem with the Radiator Cooling Fan Motor Control system, typically involving the fan's operation or its control circuit.

2. What are the common symptoms of a P1900 code?

Symptoms may include the cooling fan not working, engine overheating, poor air conditioning performance, or the check engine light being illuminated.

3. What causes the P1900 code to appear on an Infiniti?

Common causes include a faulty cooling fan motor, damaged wiring or connectors in the fan circuit, a defective fan control module, or issues with the engine control unit (ECU).

4. Can a P1900 code cause engine damage if left unresolved?

Yes, if the cooling fan doesn't operate properly, the engine could overheat, potentially leading to severe damage.

5. How is the P1900 code diagnosed?

A mechanic will inspect the cooling fan motor, wiring, and control module, check for power and ground at the fan, and use a scan tool to verify the fault and test system operation.

6. Can you drive with a P1900 code on an Infiniti?

Itâ€™s not recommended, as the engine may overheat if the cooling fan is not functioning correctly, which could cause further damage.

7. How is the P1900 code fixed?

Repairs may involve replacing the cooling fan motor, repairing or replacing damaged wiring, or replacing a faulty fan control module.

8. How much does it cost to fix the P1900 code?

Repair costs can range from $150 to $750, depending on whether the issue is with the fan motor, wiring, or control module, and labor rates in your area.

9. Can a low coolant level trigger the P1900 code?

No, low coolant typically wonâ€™t cause this code, but it can contribute to overheating, which may exacerbate cooling fan issues.

10. How can I prevent the P1900 code from occurring?

Regular maintenance, such as checking the cooling system, inspecting wiring, and ensuring the fan operates correctly, can help prevent issues related to the P1900 code.