AutoCodes – Cadillac – U1888 Cadillac

U1888 Cadillac 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 Cadillac 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 674

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

What does this mean?

What are the Possible Causes of the DTC U1888 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are common symptoms of OBDII code U1888 in a Cadillac related to the Hybrid Control Module losing communication with the Energy Storage Control Module?

- Common symptoms include loss of hybrid system functionality, reduced fuel efficiency, and warning lights on the dashboard.

2. What are possible causes of the U1888 code in a Cadillac?

- Possible causes include wiring issues, faulty control modules, software glitches, or a weak connection between the hybrid control module and the energy storage control module.

3. How can I diagnose the U1888 code in my Cadillac?

- Diagnosing the U1888 code typically involves using an OBDII scanner to retrieve the code, inspecting the wiring and connections between the control modules, and checking for any other related trouble codes.

4. Can I continue driving my Cadillac with the U1888 code present?

- It is not recommended to continue driving your Cadillac with the U1888 code present, as it can lead to further damage to the hybrid system. It's best to have the issue diagnosed and repaired promptly.

5. What are some repair tips for fixing the U1888 code in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections between control modules, updating software if necessary, and resetting the fault code after repairs are completed.

6. How much does it typically cost to repair the U1888 code in a Cadillac?

- The cost of repairing the U1888 code can vary depending on the exact cause of the issue. Costs may include labor charges for diagnosis and repair, replacement parts, and any software updates needed.

7. Is the U1888 code specific to Cadillac vehicles only?

- While the U1888 code may be more common in Cadillac vehicles, it can potentially occur in other vehicles with hybrid systems as well, especially if there are communication issues between control modules.

8. Can I reset the U1888 code in my Cadillac without fixing the underlying issue?

- While you may be able to clear the U1888 code temporarily, it is not recommended to do so without addressing the underlying communication problem between the hybrid control module and the energy storage control module.

9. Will the U1888 code cause my Cadillac to fail an emissions test?

- The U1888 code itself may not directly cause your Cadillac to fail an emissions test, but it is still important to address the issue to ensure proper functioning of the hybrid system and overall vehicle performance.

10. How can I prevent the U1888 code from recurring in my Cadillac?

- To prevent the U1888 code from recurring, it's important to ensure regular maintenance of the hybrid system, address any wiring or connection issues promptly, and follow manufacturer-recommended service intervals for your Cadillac.