AutoCodes – Audi – P1601 Audi

P1601 Audi Code - Engine Control Module Supply Voltage

Quick Answer

Battery positive voltage is supplied to the Engine Control Module (ECM) even when the ignition switch is OFF for use by the Diagnostic Trouble Code (DTC) memory and airâ€“fuel ratio adaptive control value memory, etc. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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: P1601 Audi indicates Engine Control Module Supply Voltage.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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 10,933

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1601 Audi Description

OBDII Code P1601 Audi - Engine Control Module Supply Voltage - AutoCodes.com — P1601 Audi Code - Engine Control Module Supply Voltage

What does this mean?

What are the Possible Causes of the DTC P1601 Audi?

Faulty Engine Control Module (ECM)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC P1601 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 P1601 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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Need more information on how to fix the P1601 Audi code? Get Access to Factory Service Manuals

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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 P1601 Audi Code

1. What does the OBDII code P1601 mean on an Audi?

P1601 indicates an issue with the Engine Control Module (ECM) supply voltage, meaning the ECM is not receiving the proper voltage to function correctly.

2. What are the common symptoms of code P1601 on an Audi?

Symptoms may include difficulty starting the engine, stalling, poor engine performance, a lit check engine light, and in some cases, the vehicle not starting at all.

3. What causes the P1601 code on an Audi?

Common causes include a weak or failing battery, corroded or loose battery terminals, damaged wiring or connectors to the ECM, or a faulty ECM.

4. Can a dead battery cause the P1601 code?

Yes, a weak or dead battery can cause insufficient voltage to the ECM, triggering the P1601 code.

5. How do I fix the P1601 code on my Audi?

Start by checking the battery and charging system, inspecting wiring and connectors for damage or corrosion, and ensuring the ECM is properly grounded. Replace any faulty components as needed.

6. Can driving with code P1601 damage my Audi?

Driving with this code may lead to poor engine performance or stalling, and if left unresolved, it could result in further damage to the ECM or other electrical components.

7. How do I test the battery if I have a P1601 code?

Use a multimeter to check the battery voltage. It should read around 12.6 volts when the engine is off and 13.7â€“14.7 volts when the engine is running.

8. Can a faulty alternator trigger the P1601 code on an Audi?

Yes, a malfunctioning alternator can fail to supply adequate voltage to the ECM, causing the P1601 code.

9. Is replacing the ECM always necessary to fix the P1601 code?

No, replacing the ECM is a last resort. Most P1601 issues are related to battery, wiring, or grounding problems that can be resolved without replacing the ECM.

10. How much does it cost to repair the P1601 code on an Audi?

The cost varies depending on the root cause. A battery replacement may cost $100â€“$300, while wiring repairs could range from $50â€“$200. ECM replacement, if necessary, can cost $500â€“$1,500 or more.