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

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

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

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

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

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

"Of 2 NHTSA reports for this code on CHEVROLET MALIBU, 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 MALIBU 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 MALIBU

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 MALIBU owners have reported this issue to NHTSA across model years 2008-2020. Most reports come from the 2008, 2020 model years. The most commonly reported component is Electrical System (50.0% of reports).

Real CHEVROLET MALIBU Owner Reports

Source: NHTSA Complaints Database

"I have had the car for almost 2 years the computer crashed (code u0100 ecm pcma) unfortunately the car doesn't start at all so now i may have to get a new car because the car lot doesn't want to pay for it."

— 2008 CHEVROLET MALIBU owner · ELECTRICAL SYSTEM · Filed 06/02/2020

"The problems listed in my vehicle are the following • U0073: Control Module Communication Bus A Off • U0100: Lost Communication With Engine Control Module • U0121: Lost Communication with Electronic Brake Control Module • U0140: Lost Communication With Body Control Module • P0700: Transmission Con"

— 2020 CHEVROLET MALIBU owner · ELECTRICAL SYSTEM,SERVICE BRAKES · Filed 07/25/2024

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

📊 Complaint Trend by Model Year

1

'08

1

'20

Common Causes on CHEVROLET MALIBU

Based on NHTSA complaint component analysis for this vehicle.

ELECTRICAL SYSTEM 50%

ELECTRICAL SYSTEM,SERVICE BRAKES 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 MALIBU? ▾

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

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

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

Is U0100 serious on my CHEVROLET MALIBU? ▾

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

What should I do if my CHEVROLET MALIBU 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.