AutoCodes – Audi – P179C Audi

P179C Audi Code - Main Pressure Valve Electric Fault

Quick Answer

The Engine Control Module (ECM) monitors the Main Pressure Valve. Common causes include Faulty Main Pressure Valve, Main Pressure Valve harness is open or shorted, Main Pressure Valve 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: P179C Audi indicates Main Pressure Valve Electric Fault.
Common causes: Common causes include Faulty Main Pressure Valve, Main Pressure Valve harness is open or shorted, Main Pressure Valve 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 7,543

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 Jan 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P179C Audi Description

The Engine Control Module (ECM) monitors the Main Pressure Valve. The ECM sets the OBDII code when the Main Pressure Valve is not to factory specifications.

OBDII Code P179C Audi - Main Pressure Valve Electric Fault - AutoCodes.com — P179C Audi Code - Main Pressure Valve Electric Fault

What does this mean?

What are the Possible Causes of the DTC P179C Audi?

Faulty Main Pressure Valve
Main Pressure Valve harness is open or shorted
Main Pressure Valve circuit poor electrical connection

How to Fix the DTC P179C 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 P179C 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 P179C Audi Code

1. What are the common symptoms of an OBDII code P179C in an Audi related to the Main Pressure Valve Electric Fault?

Symptoms may include harsh shifting, transmission slipping, poor acceleration, and the transmission going into limp mode.

2. What are the possible causes of the Main Pressure Valve Electric Fault (code P179C) in an Audi?

Common causes include a faulty main pressure valve, electrical issues in the transmission control module, wiring problems, or a malfunctioning transmission fluid pressure sensor.

3. How can I diagnose the Main Pressure Valve Electric Fault (P179C) in my Audi?

Diagnosis typically involves using a professional OBDII scanner to retrieve the fault code, checking the transmission fluid level and condition, and inspecting the electrical connections related to the main pressure valve.

4. Is it safe to continue driving my Audi with the OBDII code P179C indicating a Main Pressure Valve Electric Fault?

It is not recommended to drive your Audi with this fault code as it can lead to further damage to the transmission. It is advisable to have the issue diagnosed and repaired promptly.

5. Can I reset the OBDII code P179C related to the Main Pressure Valve Electric Fault in my Audi?

While you can clear the fault code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

6. What are some repair tips for fixing the Main Pressure Valve Electric Fault (P179C) in an Audi?

Repair tips may include checking and replacing the main pressure valve, inspecting and repairing any damaged wiring or connectors, and ensuring proper transmission fluid levels and quality.

7. How much does it typically cost to repair the Main Pressure Valve Electric Fault (code P179C) in an Audi?

The cost of repair can vary depending on the underlying cause of the fault. It is recommended to consult with a professional mechanic or dealership for an accurate estimate.

8. Can a DIY enthusiast fix the Main Pressure Valve Electric Fault (P179C) in an Audi?

While some experienced DIY enthusiasts may be able to diagnose and repair simple electrical or mechanical issues related to this fault, it is generally advisable to seek professional help for transmission-related problems.

9. What long-term problems can arise if the Main Pressure Valve Electric Fault (P179C) in an Audi is left unresolved?

Continued driving with this fault can lead to further damage to the transmission, potentially resulting in a costly repair or replacement of transmission components.

10. How can I prevent the recurrence of the Main Pressure Valve Electric Fault (P179C) in my Audi?

Regularly servicing the transmission, ensuring proper fluid levels and quality, and addressing any electrical issues promptly can help prevent the reoccurrence of this fault code.