AutoCodes – Generic – U011A

U011A Code - Lost Communication With Exhaust Gas Sensor Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Exhaust Gas Sensor Module, Exhaust Gas Sensor Module harness is open or shorted, Exhaust Gas Sensor 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: U011A indicates Lost Communication With Exhaust Gas Sensor Module.
Common causes: Common causes include Faulty Exhaust Gas Sensor Module, Exhaust Gas Sensor Module harness is open or shorted, Exhaust Gas Sensor 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 8,500

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 Mar 30, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code U011A Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Exhaust Gas Sensor Module has not been received.

OBDII Code U011A - Lost Communication With Exhaust Gas Sensor Module - AutoCodes.com — U011A Code - Lost Communication With Exhaust Gas Sensor Module

What does this mean?

What are the Possible Causes of the DTC U011A?

Faulty Exhaust Gas Sensor Module
Exhaust Gas Sensor Module harness is open or shorted
Exhaust Gas Sensor Module circuit poor electrical connection

How to Fix the DTC U011A?

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 U011A 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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Information for Specific Makes

U011A Chrysler — Lost Communication With Exhaust Gas Sensor Module
U011A Dodge — Lost Communication With Exhaust Gas Sensor Module
U011A Jeep — Lost Communication With Exhaust Gas Sensor Module
U011A RAM — Lost Communication With Exhaust Gas Sensor Module

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.