U1887 Buick Code - Energy Storage Control Module Lost Communication With Starter/Generator 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 Starter/Generator Control Module (SGCM), Starter/Generator Control Module harness is open or shorted, Starter/Generator 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
- U1887 Buick indicates Energy Storage Control Module Lost Communication With Starter/Generator Control Module.
- Common causes
- Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module harness is open or shorted, Starter/Generator 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.
Code U1887 Buick Description
What are the Possible Causes of the DTC U1887 Buick?
- Faulty Starter/Generator Control Module (SGCM)
- Starter/Generator Control Module harness is open or shorted
- Starter/Generator Control Module circuit poor electrical connection
- Faulty Energy Storage Control Module (ESCM)
How to Fix the DTC U1887 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 U1887 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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Frequently Asked Questions about U1887 Buick Code
1. What does the OBDII code U1887 mean on a Buick?
The U1887 code indicates that the Energy Storage Control Module (ESCM) has lost communication with the Starter/Generator Control Module (SGCM).
2. What are the common symptoms of the U1887 code on a Buick?
Symptoms may include a check engine light, reduced fuel efficiency, hybrid system malfunctions, failure of the auto start-stop system, or loss of power assist.
3. What causes the U1887 code to appear on a Buick?
The most common causes are faulty wiring or connectors between the ESCM and SGCM, a malfunctioning ESCM or SGCM, or a failed communication network (CAN bus issue).
4. Can the U1887 code cause drivability issues?
Yes, it can lead to reduced performance of the hybrid or start-stop system, which may affect overall drivability depending on the severity of the issue.
5. How do I diagnose the U1887 code on my Buick?
Diagnosis involves inspecting the wiring and connectors between the ESCM and SGCM, checking for CAN bus network faults, and testing the modules for proper operation using a scan tool.
6. Is it safe to drive with the U1887 code active?
It may be safe to drive short distances, but since the code can affect hybrid system functionality or other critical components, it’s best to address it promptly.
7. How do I fix the U1887 code on a Buick?
Repairs may include fixing damaged wiring, replacing faulty connectors, reprogramming or replacing the ESCM or SGCM, or resolving CAN bus communication faults.
8. Do I need to replace the Energy Storage Control Module to fix the U1887 code?
Not necessarily; the issue could be related to wiring, connectors, or the SGCM. Proper diagnosis is required to determine the root cause.
9. Can a low or faulty battery cause the U1887 code?
Yes, a weak or failing battery can disrupt communication between modules and may trigger this code.
10. Will clearing the U1887 code with a scan tool fix the issue?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.
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