AutoCodes – Audi – U1113 Audi

U1113 Audi Code - Invalid Or Missing Data For Primary Id

Quick Answer

This is a manufacturer specific fault code and can be used for several different faults, depending upon what the manufacturer wants to use it for. Common causes include Faulty / intermittent ignition switch connections, J1850 / SCP / CAN Bus wiring intermittently open, shorted to power or ground, Faulty / intermittent connection at the Powertrain Control Module (PCM). 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: U1113 Audi indicates Invalid Or Missing Data For Primary Id.
Common causes: Common causes include Faulty / intermittent ignition switch connections, J1850 / SCP / CAN Bus wiring intermittently open, shorted to power or ground, Faulty / intermittent connection at the Powertrain Control Module (PCM).
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 26,299

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 Apr 21, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1113 Audi Description

This is a manufacturer specific fault code and can be used for several different faults, depending upon what the manufacturer wants to use it for. Controllers communicate over the Serial Communication Protocol (SCP) bus network, also known as J1850 bus, or Controller Area Network or CAN Bus. These bus communication systems may or may not be fault tolerant, which means any type of intermittent/loose connection between these controllers could cause communication to stop. When these controllers are unable to communicate with each other at any time while the ignition switch is turned on, code U1113 will set.

OBDII Code U1113 Audi - Invalid Or Missing Data For Primary Id - AutoCodes.com — U1113 Audi Code - Invalid Or Missing Data For Primary Id

What does this mean?

What are the Possible Causes of the DTC U1113 Audi?

Faulty / intermittent ignition switch connections
J1850 / SCP / CAN Bus wiring intermittently open, shorted to power or ground
Faulty / intermittent connection at the Powertrain Control Module (PCM)
Faulty / intermittent connection at the Airbag Control Module

How to Fix the DTC U1113 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 U1113 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 U1113 Audi Code

1. What does the OBDII code U1113 for Audi mean?

The U1113 code indicates Invalid Or Missing Data For Primary Id in the vehicle's communication network.

2. What are the common symptoms of an U1113 code in an Audi?

Common symptoms include issues with the vehicle's communication system, such as loss of data or connection errors.

3. What are the possible causes of the U1113 code in an Audi?

Possible causes include faulty wiring, loose connections, issues with the CAN bus system, or a malfunctioning control module.

4. How serious is the U1113 code in an Audi?

While the U1113 code may not always result in noticeable drivability issues, it is important to address communication network problems promptly to prevent potential safety hazards.

5. How do I diagnose the U1113 code in my Audi?

Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, checking the wiring and connections in the communication network, and testing the control modules for faults.

6. Can I drive my Audi with an U1113 code?

It is generally not recommended to drive the vehicle with unresolved communication network issues, as it may lead to further electrical problems or malfunctions.

7. How can I repair the U1113 code in my Audi?

Repair options may include repairing or replacing damaged wiring, ensuring proper connections, resetting control modules, or seeking assistance from a professional mechanic.

8. Will resetting the trouble codes make the U1113 code disappear?

Resetting the trouble codes may temporarily clear the U1113 code, but it is crucial to address the underlying communication network issue to prevent the code from reoccurring.

9. Can extreme weather conditions trigger the U1113 code in an Audi?

Extreme weather conditions, such as extreme cold or heat, can potentially affect the vehicle's communication network and contribute to triggering the U1113 trouble code.

10. Is it necessary to visit a dealership for U1113 repairs in an Audi?

While visiting a dealership is an option, independent auto repair shops with experience in diagnosing and repairing communication network issues can also effectively address the U1113 trouble code in an Audi.

Discuss the causes and fixes for U1113 Audi OBDII Code

Submit a New Comment

Robert
Date: May 5, 2025 at 12:02 pm

I had a brake light on my 2016 Audi prion plus 2.0 engine run smoother. I change the front brakes and rotors as well as the bakcc brake . The check brake system light went off for three weeks. It was taking back to the shop for motor mounts 3 days later the brake light came back with a U113 code , what can should I do .

Reply to Comment
- OBDIITech
  Date: May 6, 2025 at 7:19 pm
  Thanks for sharing the details. The U1113 code on your 2016 Audi usually means there’s a communication issue between one of the modules—often the ABS, brake control module, or another system that’s supposed to send data over the CAN network.
  
  Here’s what I’d suggest:
  - First, double-check all brake-related connectors, especially ABS wheel speed sensors and wiring near the wheels. Sometimes when brake work is done, the sensor wires get tugged, pinched, or not fully plugged back in.
  - Since the code came back after motor mount work, it's possible something was disturbed during that repair. Check the ground straps and connectors near the transmission and engine—poor grounds or loose plugs can cause intermittent communication issues.
  - Also, scan the car with a VAG-COM or full-system scanner, not just a basic OBD tool. You’ll want to see if any other modules have lost communication or show related codes. That’ll help pinpoint where the fault is coming from.
  The brake light may just be a side effect of the U-code—if the ABS or another brake-related module isn’t communicating right, it’ll trigger that warning.
  
  Hope this helps narrow it down. Let me know if you need help locating any of those components.
  Reply to Comment