AutoCodes – KIA – U1121 KIA

U1121 KIA Code - Lost Communication With Electric Stability Program Module

Quick Answer

Several control units are applied to electronically controlled vehicles. Common causes include Faulty Electronic Stability Control (ESC) Module, Electronic Stability Control Module harness is open or shorted, Electronic Stability Control Module 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: U1121 KIA indicates Lost Communication With Electric Stability Program Module.
Common causes: Common causes include Faulty Electronic Stability Control (ESC) Module, Electronic Stability Control Module harness is open or shorted, Electronic Stability Control Module 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 1,178

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 Aug 21, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1121 KIA Description

Several control units are applied to electronically controlled vehicles. These units perform each control with information from various sensors. Thus, sharing signal information from sensors is needed, so CAN communication type whose communication speed is high and insensitive to electrical noise by spark generation is adopted to controlling powertrain (TCM, ECM, CLUSTER, Electronic Stability Control (ESC), 4WD, SAS, EPS). CAN communication consists of CAN-BUS HIGH, CAN BUS LOW, and two 120 ohm resistance in the circuit. If the 4WD ECU doesn't get some ESC signals from the ESC module, it sets U1126.

OBDII Code U1121 KIA - Lost Communication With Electric Stability Program Module - AutoCodes.com — U1121 KIA Code - Lost Communication With Electric Stability Program Module

What does this mean?

What are the Possible Causes of the DTC U1121 KIA?

Faulty Electronic Stability Control (ESC) Module
Electronic Stability Control Module harness is open or shorted
Electronic Stability Control Module circuit poor electrical connection

How to Fix the DTC U1121 KIA?

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 U1121 KIA 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 U1121 KIA Code

1. What does the OBDII code U1121 for KIA mean?

The code U1121 indicates that there is a communication problem between the vehicle's onboard diagnostic system and the Electric Stability Program (ESP) module.

2. What are common symptoms of the U1121 code in a KIA vehicle?

Common symptoms include the ABS warning light, traction control light, or stability control light coming on, as well as potential issues with the vehicle's ABS and traction control systems.

3. What are some possible causes of the U1121 code in a KIA?

Potential causes include a faulty ESP module, damaged wiring or connectors in the communication network, a software issue, or a problem with the vehicle's powertrain control module (PCM).

4. How can I diagnose the U1121 code in my KIA?

Diagnosing the U1121 code typically involves using a diagnostic scanner to retrieve the code and then inspecting the ESP module, wiring connections, and other relevant components for any signs of damage or malfunction.

5. Can I still drive my KIA with the U1121 code present?

It is generally not recommended to drive the vehicle with the U1121 code active, as it can affect the operation of important safety systems like ABS and traction control. It's best to have the issue diagnosed and repaired as soon as possible.

6. How can I repair the U1121 code in my KIA?

Repairing the U1121 code may involve replacing the ESP module, repairing damaged wiring or connectors, updating software, or addressing any underlying issues with the PCM. It's advisable to consult a professional mechanic for an accurate diagnosis and repair.

7. Is the U1121 code in a KIA a serious issue?

While the U1121 code itself may not pose an immediate danger, it can impact the vehicle's safety systems. It's important to address the issue promptly to ensure the proper operation of ABS, traction control, and stability control systems.

8. How much does it typically cost to repair the U1121 code in a KIA?

The cost of repairing the U1121 code can vary depending on the specific cause of the issue, the required repairs or replacements, and labor costs. It's recommended to obtain quotes from reputable mechanics or dealerships for an accurate estimate.

9. Can I reset the U1121 code in my KIA on my own?

While you can clear the code with a diagnostic scanner, it's crucial to address the underlying issue causing the U1121 code. Simply resetting the code without fixing the problem may result in it returning and potentially causing more serious issues.

10. Does the U1121 code in a KIA affect vehicle performance?

The U1121 code itself may not directly impact performance, but it can lead to issues with ABS, traction control, and stability control systems, which can affect handling and safety. It's best to have the problem resolved to ensure optimal vehicle performance.