AutoCodes – Generic – U0133

U0133 Code - Lost Communication With Active Roll Control 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 Active Roll Control Module, Active Roll Control Module harness is open or shorted, Active Roll 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: U0133 indicates Lost Communication With Active Roll Control Module.
Common causes: Common causes include Faulty Active Roll Control Module, Active Roll Control Module harness is open or shorted, Active Roll 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 4,323

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 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code U0133 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 Active Roll Control Module has not been received.

OBDII Code U0133 - Lost Communication With Active Roll Control Module - AutoCodes.com — U0133 Code - Lost Communication With Active Roll Control Module

What does this mean?

What are the Possible Causes of the DTC U0133?

Faulty Active Roll Control Module
Active Roll Control Module harness is open or shorted
Active Roll Control Module circuit poor electrical connection

How to Fix the DTC U0133?

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 U0133 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

U0133 Buick — Lost Communication With Air Suspension Control Module
U0133 Cadillac — Lost Communication With Air Suspension Control Module
U0133 Chevrolet — Lost Communication With Air Suspension Control Module
U0133 Ford — Lost Communication With Active Roll Control Module
U0133 GMC — Lost Communication With Air Suspension Control Module
U0133 Lincoln — Lost Communication With Active Roll Control Module
U0133 Mercury — Lost Communication With Active Roll Control 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.