# Glow Plug Failure on Cold Inland Empire Mornings

Canonical: https://commercialvanrepairshop.com/blog/glow-plug-failure-cold-inland-empire-mornings/
Business: Commercial Van Repair Shop, Yorba Linda, CA. Serving Riverside, California.
Phone: (714) 646-1433 | Email: info@ocrvcenter.com

Category: Sprinter and Diesel Repair | Published: 2026-01-14

Worn glow plugs make a diesel Sprinter hard to start on cold Inland Empire mornings, idle rough for the first minute, and often set a fault code. Replacing the plugs and checking the glow plug control module restores clean cold starts and keeps a work van reliable in winter.

## How Glow Plugs Fail

Glow plugs preheat the cylinders so diesel ignites when the engine is cold. They wear out over time, and one seized or broken plug can be a real job to extract. A failing control module can also mimic bad plugs, so we test both before quoting.
- Extended cranking below 50 degrees
- A flashing preheat light or stored glow plug codes
- Rough idle and white smoke until the engine warms
- One or more plugs reading out of resistance range

## Getting It Right the First Time

Broken glow plugs need careful extraction so a piece does not drop into the cylinder. We use the correct tools and factory data, then verify the module and wiring so the repair holds.
If your Sprinter is slow to start on cold mornings, our engine and drivetrain service at /services/engine-drivetrain/glow-plug-replacement/ sorts it out. Call (714) 646-1433 or use /contact/ to Book Appointment.