P1911 Audi Code - Data Bus ECM 1/2 Circuit Malfunction
Quick Answer
P1911 Audi indicates Data Bus ECM 1/2 Circuit Malfunction. 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
- P1911 Audi indicates Data Bus ECM 1/2 Circuit Malfunction.
- 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.
Code P1911 Audi Description
What are the Possible Causes of the DTC P1911 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 P1911 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 P1911 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 P1911 Audi Code
1. What does the OBDII code P1911 mean on an Audi?
P1911 indicates a "Data Bus ECM 1/2 Circuit Malfunction," meaning there is a communication issue between the engine control modules (ECM 1 and ECM 2) on the vehicle's data bus network.
2. What are the common symptoms of the P1911 code on an Audi?
Common symptoms include the check engine light being illuminated, reduced engine performance, poor fuel efficiency, erratic shifting (in automatic vehicles), or difficulty starting the engine.
3. What causes the P1911 code to appear?
The code can be triggered by faulty wiring or connectors in the data bus circuit, a malfunctioning ECM, software issues, or interference from other failing components on the data bus network.
4. How is the P1911 code diagnosed?
A technician will use a diagnostic scanner to verify the code, inspect the data bus wiring and connectors for damage or corrosion, and test the communication signal between ECM 1 and ECM 2.
5. Can a P1911 code cause long-term damage if ignored?
Ignoring this code can lead to worsening performance issues, potential damage to the ECMs, or failure of other systems that rely on accurate data communication.
6. Is it safe to drive with the P1911 code on an Audi?
Driving with the P1911 code is not recommended, as it may cause unpredictable performance issues or result in the vehicle entering limp mode, which limits power and drivability.
7. How can I fix the P1911 code on my Audi?
Repairs may involve inspecting and repairing damaged wiring or connectors, reprogramming or updating the ECM software, or replacing a faulty ECM if necessary.
8. Can a weak battery cause the P1911 code?
Yes, a weak or failing battery can cause voltage fluctuations that may disrupt communication on the data bus network and trigger the P1911 code.
9. How much does it cost to repair an Audi with a P1911 code?
Repair costs can vary, ranging from $100–$300 for wiring repairs to over $1,000 if an ECM replacement is needed. Diagnostic fees may also apply.
10. How can I prevent the P1911 code from reoccurring?
Regularly inspect and maintain the vehicle's electrical system, ensure software updates are applied, and address any warning signs like flickering lights or intermittent power loss promptly.
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