Engine-Codes - Generic - U1121

U1121 Code - Lost Communication With Electric Stability Program Module

- Code Popularity: 20,749 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC U1121?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Electronic Stability Control (ESC) Module
  • Electronic Stability Control Module harness is open or shorted
  • Electronic Stability Control Module circuit poor electrical connection
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How to Fix the DTC U1121?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the U1121 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the U1121 Code Mean?

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.

U1121 Code - Lost Communication With Electric Stability Program Module

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Code U1121 Information for Specific Makes

  • U1121 Hyundai Lost Communication With Electric Stability Program Module
  • U1121 KIA Lost Communication With Electric Stability Program Module

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