AutoCodes – Buick – U1888 Buick

U1888 Buick Code - Hybrid Control Module Lost Communication With Energy Storage Control Module

Quick Answer

Modules connected to the class 2 and high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Energy Storage Control Module (ESCM), Energy Storage Control Module harness is open or shorted, Energy Storage 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: U1888 Buick indicates Hybrid Control Module Lost Communication With Energy Storage Control Module.
Common causes: Common causes include Faulty Energy Storage Control Module (ESCM), Energy Storage Control Module harness is open or shorted, Energy Storage 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 571

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 Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1888 Buick Description

Modules connected to the class 2 and high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The Diagnostic Trouble Code (DTC) is reported on a class 2 link to the scan tool by Powertrain Control Module (PCM) even if they may be set by different modules. The DTC will set when a node alive message has not been received from an identified module within the last 5 seconds after establishing class 2 serial data communication, or a supervised high-speed GMLAN message has not been received.

OBDII Code U1888 Buick - Hybrid Control Module Lost Communication With Energy Storage Control Module - AutoCodes.com — U1888 Buick Code - Hybrid Control Module Lost Communication With Energy Storage Control Module

What does this mean?

What are the Possible Causes of the DTC U1888 Buick?

Faulty Energy Storage Control Module (ESCM)
Energy Storage Control Module harness is open or shorted
Energy Storage Control Module circuit poor electrical connection
Faulty Hybrid Control Module (HCM)

How to Fix the DTC U1888 Buick?

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 U1888 Buick 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.

Frequently Asked Questions about U1888 Buick Code

1. What are the common symptoms of OBDII code U1888 in a Buick hybrid vehicle?

- Common symptoms include the hybrid system not engaging, poor fuel efficiency, warning lights on the dashboard, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code U1888 in a Buick hybrid vehicle?

- The code U1888 typically indicates a communication issue between the Hybrid Control Module and the Energy Storage Control Module. Possible causes include wiring issues, faulty modules, or a weak battery.

3. How can I diagnose OBDII code U1888 in my Buick hybrid vehicle?

- Diagnosing this code requires specialized diagnostic equipment to scan the hybrid system for fault codes and perform communication tests between the modules. A professional technician with experience in hybrid systems is recommended for accurate diagnosis.

4. What are some repair tips for fixing OBDII code U1888 in a Buick hybrid vehicle?

- Repair tips include inspecting and repairing any damaged wiring, ensuring proper connections between modules, updating software if available, and performing a voltage test on the energy storage system.

5. Can I drive my Buick hybrid with OBDII code U1888 present?

- It is not recommended to drive your vehicle with this code present, as it can affect the performance and safety of the hybrid system. Have the issue diagnosed and repaired as soon as possible.

6. How much does it typically cost to repair OBDII code U1888 in a Buick hybrid vehicle?

- The cost of repairs can vary depending on the exact cause of the communication issue. It is advisable to get a diagnosis from a professional technician to get an accurate estimate.

7. Is OBDII code U1888 in a Buick hybrid vehicle a common issue?

- While not extremely common, communication issues between modules in hybrid vehicles can occur due to various factors. Regular maintenance and proper care can help prevent such issues.

8. Can I reset OBDII code U1888 in my Buick hybrid vehicle by disconnecting the battery?

- Disconnecting the battery may temporarily clear the code, but it will likely return if the underlying issue is not addressed. It is best to diagnose and repair the root cause of the problem.

9. Are there any recalls related to OBDII code U1888 in Buick hybrid vehicles?

- Recalls related to this specific code may vary by model and year. Check with your local Buick dealership or the National Highway Traffic Safety Administration (NHTSA) for any relevant recalls.

10. How can I prevent OBDII code U1888 from occurring in my Buick hybrid vehicle?

- To prevent this code, ensure regular maintenance of the hybrid system, keep the battery in good condition, and address any warning lights or performance issues promptly.