P1904 Audi Code - Engine Coolant Hydraulic Blower Motor Solenoid Open Circuit/Short To Ground
Quick Answer
P1904 Audi indicates Engine Coolant Hydraulic Blower Motor Solenoid Open Circuit/Short To Ground. Common causes include Faulty Engine Coolant Hydraulic Blower Motor Solenoid, Engine Coolant Hydraulic Blower Motor Solenoid harness is open or shorted, Engine Coolant Hydraulic Blower Motor Solenoid 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
- P1904 Audi indicates Engine Coolant Hydraulic Blower Motor Solenoid Open Circuit/Short To Ground.
- Common causes
- Common causes include Faulty Engine Coolant Hydraulic Blower Motor Solenoid, Engine Coolant Hydraulic Blower Motor Solenoid harness is open or shorted, Engine Coolant Hydraulic Blower Motor Solenoid 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 P1904 Audi Description
What are the Possible Causes of the DTC P1904 Audi?
- Faulty Engine Coolant Hydraulic Blower Motor Solenoid
- Engine Coolant Hydraulic Blower Motor Solenoid harness is open or shorted
- Engine Coolant Hydraulic Blower Motor Solenoid circuit poor electrical connection
How to Fix the DTC P1904 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 P1904 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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Frequently Asked Questions about P1904 Audi Code
1. What does the OBDII code P1904 mean on an Audi?
The P1904 code indicates an issue with the Engine Coolant Hydraulic Blower Motor Solenoid, specifically an open circuit or a short to ground.
2. What are the common symptoms of the P1904 code in an Audi?
Symptoms may include the check engine light turning on, overheating issues, reduced cooling performance, or unusual noises from the cooling system.
3. What causes the P1904 code to appear?
Common causes include damaged wiring, a faulty hydraulic blower motor solenoid, corroded electrical connections, or a malfunctioning control module.
4. Can I drive my Audi with the P1904 code active?
It’s not recommended, as the code may lead to engine overheating or other performance issues that can cause further damage.
5. How do I diagnose the P1904 code in an Audi?
Start by inspecting the solenoid wiring and connections for damage or corrosion, then test the solenoid for proper operation using a multimeter.
6. What repairs are commonly needed to resolve the P1904 code?
Repairs may include replacing the faulty solenoid, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming the control module.
7. How much does it typically cost to fix the P1904 code on an Audi?
Repair costs vary but may range from $100 to $500 depending on whether wiring repairs or solenoid replacement is needed.
8. Can a faulty hydraulic blower motor solenoid cause engine overheating?
Yes, a malfunctioning solenoid can impair coolant circulation, leading to overheating.
9. Will clearing the P1904 code fix the problem?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be repaired to prevent the code from returning.
10. How can I prevent the P1904 code from recurring?
Regular maintenance, including inspecting and cleaning electrical connections and ensuring proper coolant system operation, can help prevent this issue.
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