AutoCodes – Generic – U025A

U025A Code - Lost Communication With Special Purpose Vehicle Control Module 'B'

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 Special Purpose Vehicle Control Module 'B', Special Purpose Vehicle Control Module 'B' harness is open or shorted, Special Purpose Vehicle Control Module 'B' 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: U025A indicates Lost Communication With Special Purpose Vehicle Control Module 'B'.
Common causes: Common causes include Faulty Special Purpose Vehicle Control Module 'B', Special Purpose Vehicle Control Module 'B' harness is open or shorted, Special Purpose Vehicle Control Module 'B' 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 1,681

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 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code U025A 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 Special Purpose Vehicle Control Module 'B' has not been received.

OBDII Code U025A - Lost Communication With Special Purpose Vehicle Control Module 'B' - AutoCodes.com — U025A Code - Lost Communication With Special Purpose Vehicle Control Module 'B'

What does this mean?

What are the Possible Causes of the DTC U025A?

Faulty Special Purpose Vehicle Control Module 'B'
Special Purpose Vehicle Control Module 'B' harness is open or shorted
Special Purpose Vehicle Control Module 'B' circuit poor electrical connection

How to Fix the DTC U025A?

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 U025A 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.