AutoCodes – Audi – P1901 Audi

P1901 Audi Code - Engine Coolant Blower Motor Run-On Relay Short To Positive

Quick Answer

The Engine Control Module (ECM) monitors the Engine Coolant Blower Motor. Common causes include Faulty Engine Coolant Blower Motor Run-On Relay, Engine Coolant Blower Motor Run-On Relay harness is open or shorted, Engine Coolant Blower Motor Run-On 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: P1901 Audi indicates Engine Coolant Blower Motor Run-On Relay Short To Positive.
Common causes: Common causes include Faulty Engine Coolant Blower Motor Run-On Relay, Engine Coolant Blower Motor Run-On Relay harness is open or shorted, Engine Coolant Blower Motor Run-On 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.

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Code Popularity 1,595

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 May 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1901 Audi Description

The Engine Control Module (ECM) monitors the Engine Coolant Blower Motor. The ECM sets the OBDII code when the Engine Coolant Blower Motor is not to factory specifications.

OBDII Code P1901 Audi - Engine Coolant Blower Motor Run-On Relay Short To Positive - AutoCodes.com — P1901 Audi Code - Engine Coolant Blower Motor Run-On Relay Short To Positive

What does this mean?

What are the Possible Causes of the DTC P1901 Audi?

Faulty Engine Coolant Blower Motor Run-On Relay
Engine Coolant Blower Motor Run-On Relay harness is open or shorted
Engine Coolant Blower Motor Run-On Relay circuit poor electrical connection

How to Fix the DTC P1901 Audi?

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 P1901 Audi 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.

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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 P1901 Audi Code

1. What does the OBDII code P1901 mean on an Audi?

P1901 indicates an issue with the Engine Coolant Blower Motor Run-On Relay, specifically a short to positive in the circuit.

2. What are the common symptoms of the P1901 code on an Audi?

Symptoms may include the cooling fan running continuously, engine overheating, poor battery performance, or an illuminated check engine light.

3. What causes the P1901 code to appear on an Audi?

The code is typically caused by a short circuit in the blower motor relay, damaged wiring, a faulty relay, or a malfunctioning engine control module (ECM).

4. Can I drive my Audi with the P1901 code?

Driving with this code is not recommended, as it can lead to engine overheating or electrical issues, potentially causing more severe damage.

5. How do I diagnose the P1901 code on my Audi?

Use an OBDII scanner to confirm the code, then inspect the blower motor relay, associated wiring, and connections for damage or short circuits.

6. What repairs are needed to fix the P1901 code?

Repairs may include replacing the blower motor relay, repairing damaged wiring, or addressing issues with the ECM if necessary.

7. How much does it cost to repair the P1901 code on an Audi?

Costs vary, but replacing the blower motor relay typically ranges from $50 to $150, excluding labor. Wiring repairs may add to the expense.

8. Can a blown fuse cause the P1901 code?

A blown fuse is unlikely to directly cause this code but could be a symptom of an underlying electrical short in the system.

9. How can I prevent the P1901 code from recurring?

Regularly inspect and maintain your carâ€™s electrical components, ensuring that wiring and relays are in good condition and free of corrosion or damage.

10. Is a professional mechanic required to fix the P1901 code on an Audi?

While some experienced DIYers can address the issue, diagnosing and repairing electrical problems often requires specialized tools and expertise, so consulting a professional is recommended.