AutoCodes – Audi – P0677 Audi

P0677 Audi Code - Cylinder 7 Glow Plug Circuit Fault

Quick Answer

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. Common causes include Faulty cylinder #7 glow plug, Cylinder #7 glow plug harness is open or shorted, Cylinder #7 glow plug 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: P0677 Audi indicates Cylinder 7 Glow Plug Circuit Fault.
Common causes: Common causes include Faulty cylinder #7 glow plug, Cylinder #7 glow plug harness is open or shorted, Cylinder #7 glow plug 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 375

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 18, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0677 Audi Description

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The Engine Control Module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The California Glow Plug system has eight individual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, the ECM sets the OBDII code.

OBDII Code P0677 Audi - Cylinder 7 Glow Plug Circuit Fault - AutoCodes.com — P0677 Audi Code - Cylinder 7 Glow Plug Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P0677 Audi?

Faulty cylinder #7 glow plug
Cylinder #7 glow plug harness is open or shorted
Cylinder #7 glow plug circuit poor electrical connection
Faulty glow plug module

How to Fix the DTC P0677 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 P0677 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 P0677 Audi Code

1. What does the OBDII code P0677 mean on an Audi?

P0677 indicates a fault in the glow plug circuit for cylinder 7, meaning the engine control module (ECM) has detected an issue with the glow plug or its electrical circuit.

2. What are the symptoms of a P0677 code in an Audi?

Symptoms may include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and the check engine light being illuminated.

3. What causes the P0677 code to appear?

Common causes include a faulty glow plug for cylinder 7, damaged wiring or connectors in the glow plug circuit, a defective glow plug control module, or corrosion in the connections.

4. Can I drive my Audi with a P0677 code?

While you can usually drive with this code, prolonged driving may lead to harder cold starts and potential damage to the glow plug system or the engine.

5. How do I diagnose a P0677 code on my Audi?

Diagnose the issue by inspecting the glow plug for cylinder 7, checking the wiring and connectors for damage or corrosion, and testing the glow plug control module for proper function.

6. How do I fix the P0677 code in an Audi?

Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the glow plug control module if needed.

7. How much does it cost to fix a P0677 code on an Audi?

The cost varies depending on the issue, but replacing a glow plug typically costs $100â€“$200, while repairs involving wiring or the control module may cost more.

8. Can a faulty glow plug control module cause the P0677 code?

Yes, a malfunctioning glow plug control module can fail to send proper voltage to the glow plug, triggering the P0677 code.

9. What tools are needed to address a P0677 code?

Youâ€™ll need an OBDII scanner, a multimeter to test voltage and continuity, and possibly basic tools for removing and replacing the glow plug or repairing wiring.

10. Will clearing the P0677 code with a scanner fix the problem?

Clearing the code may temporarily turn off the check engine light, but if the underlying issue isnâ€™t resolved, the code will likely return.