U0100 on CHEVROLET SILVERADO — Lost Communication With ECM/PCM A

Q: "What does U0100 mean on a CHEVROLET SILVERADO?"

"U0100 indicates: Lost Communication With ECM/PCM A. This is a network communication code. 2 CHEVROLET SILVERADO owners have reported this to NHTSA."

Q: "What are the most common causes of U0100 on CHEVROLET SILVERADO?"

"Based on 2 NHTSA reports, the most commonly cited components are: Electrical System,Engine, Power Train,Electrical System,Engine. These percentages are based on the component field in owner complaints."

Q: "Is U0100 serious on my CHEVROLET SILVERADO?"

"Of 2 NHTSA reports for this code on CHEVROLET SILVERADO, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my CHEVROLET SILVERADO shows U0100?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What U0100 Means on Your CHEVROLET SILVERADO

U0100 is a diagnostic trouble code indicating: Lost Communication With ECM/PCM A. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

2 CHEVROLET SILVERADO owners have reported this issue to NHTSA across model years 2007. Most reports come from the 2007 model year. The most commonly reported component is Electrical System,Engine (50.0% of reports).

Real CHEVROLET SILVERADO Owner Reports

Source: NHTSA Complaints Database

"No crank no start however engine just shit down while driving immediately lost all control of vehicle! Luckily I had just pulled off highway! No warning whatsoever it just happened out of no where now won’t start and has a u0100 code"

— 2007 CHEVROLET SILVERADO owner · ELECTRICAL SYSTEM,ENGINE · Filed 08/22/2025

"After buying this used truck from GM certified dealership having advanced inspection before we took home 3 months in First start of the day about 7AM, 5-10min into driving, no MIL light, truck engine shut off hard to pull over and I tried to restart but wouldn't start."

— 2007 CHEVROLET SILVERADO owner · POWER TRAIN,ELECTRICAL SYSTEM,ENGINE · Filed 07/08/2021

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

2

'07

Common Causes on CHEVROLET SILVERADO

Based on NHTSA complaint component analysis for this vehicle.

ELECTRICAL SYSTEM,ENGINE 50%

POWER TRAIN,ELECTRICAL SYSTEM,ENGINE 50%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does U0100 mean on a CHEVROLET SILVERADO? ▾

U0100 indicates: Lost Communication With ECM/PCM A. This is a network communication code. 2 CHEVROLET SILVERADO owners have reported this to NHTSA.

What are the most common causes of U0100 on CHEVROLET SILVERADO? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Electrical System,Engine, Power Train,Electrical System,Engine. These percentages are based on the component field in owner complaints.

Is U0100 serious on my CHEVROLET SILVERADO? ▾

Of 2 NHTSA reports for this code on CHEVROLET SILVERADO, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my CHEVROLET SILVERADO shows U0100? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.