P1399 Audi Code - Engine RPM Signal TD Short To B+
Quick Answer
P1399 Audi indicates Engine RPM Signal TD Short To B+. Common causes include Faulty Engine Speed Sensor, Engine Speed Sensor harness is open or shorted, Engine Speed Sensor 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
- P1399 Audi indicates Engine RPM Signal TD Short To B+.
- Common causes
- Common causes include Faulty Engine Speed Sensor, Engine Speed Sensor harness is open or shorted, Engine Speed Sensor 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 P1399 Audi Description
What are the Possible Causes of the DTC P1399 Audi?
- Faulty Engine Speed Sensor
- Engine Speed Sensor harness is open or shorted
- Engine Speed Sensor circuit poor electrical connection
How to Fix the DTC P1399 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 P1399 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.
Need more information about the P1399 Audi code?
Need more information on how to fix the P1399 Audi code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1399 Audi code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1399 Audi Code
1. What does the OBDII code P1399 mean on an Audi?
Code P1399 on an Audi indicates an "Engine RPM Signal TD Short To B+," meaning there is an electrical issue with the engine speed (RPM) signal circuit, typically caused by a short to the battery positive voltage (B+).
2. What are the symptoms of code P1399 in an Audi?
Common symptoms include the engine not starting, stalling, erratic RPM readings, poor performance, or the Check Engine Light being illuminated.
3. What causes the P1399 code to appear on an Audi?
The code is usually caused by a short circuit in the wiring, a faulty engine speed sensor, a damaged ECU connection, or battery voltage reaching the signal wire.
4. Can I drive my Audi with the P1399 code?
It is not recommended to drive with this code active, as it can affect engine performance and may cause stalling, which could be unsafe.
5. How do I diagnose the P1399 code in an Audi?
Start by inspecting the engine speed sensor and its wiring for damage or shorts. Use a multimeter to test the sensor and check for proper voltage levels. Scan for additional codes to narrow down the issue.
6. Can a bad crankshaft position sensor cause the P1399 code?
Yes, since the crankshaft position sensor provides the RPM signal to the ECU, a faulty sensor could trigger this code.
7. How do I fix the P1399 code on an Audi?
Repairs may involve replacing the engine speed sensor, repairing damaged wiring or connectors, and checking for shorts in the circuit.
8. What tools do I need to troubleshoot the P1399 code?
You’ll typically need an OBDII scanner, a multimeter, and wiring diagrams for your specific Audi model to troubleshoot effectively.
9. How much does it cost to repair the P1399 code on an Audi?
Repair costs vary depending on the issue but can range from $50-$150 for a sensor replacement to $200-$500 if significant electrical repairs are needed.
10. Can a low battery trigger the P1399 code?
A low or weak battery is unlikely to directly cause this code, but electrical issues related to the battery or charging system could lead to similar problems.
Discuss the causes and fixes for P1399 Audi OBDII Code
Code P1399 Audi comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
