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AutoCodes – Generic – U029A

U029A Code - Lost Communication With Hybrid Battery Pack 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 Hybrid Battery Pack Sensor Module, Hybrid Battery Pack Sensor Module harness is open or shorted, Hybrid Battery Pack 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
U029A indicates Lost Communication With Hybrid Battery Pack Sensor Module.
Common causes
Common causes include Faulty Hybrid Battery Pack Sensor Module, Hybrid Battery Pack Sensor Module harness is open or shorted, Hybrid Battery Pack 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 29,284
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Apr 06, 2020
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Code U029A 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 Hybrid Battery Pack Sensor Module has not been received.
OBDII Code U029A - Lost Communication With Hybrid Battery Pack Sensor Module - AutoCodes.com
U029A Code - Lost Communication With Hybrid Battery Pack Sensor Module
What does this mean?

What are the Possible Causes of the DTC U029A?

  • Faulty Hybrid Battery Pack Sensor Module
  • Hybrid Battery Pack Sensor Module harness is open or shorted
  • Hybrid Battery Pack Sensor Module circuit poor electrical connection

How to Fix the DTC U029A?

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 U029A 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.

Need more information about the U029A code?

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Need Help with the Code?

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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 U029A Code

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