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

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

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

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

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

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

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

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 TAHOE owners have reported this issue to NHTSA across model years 2016-2019. Most reports come from the 2016, 2019 model years. The most commonly reported component is Unknown Or Other (50.0% of reports).

Real CHEVROLET TAHOE Owner Reports

Source: NHTSA Complaints Database

"Was driving truck at 70mph on highway, went to change lanes, was in cruise control. lost all power, then all warning lights came on, check engine light on and off."

— 2016 CHEVROLET TAHOE owner · UNKNOWN OR OTHER · Filed 08/04/2019

"Purchased 2019 chevy tahoe lt on 10/27. began having serious electrical issues on 11/26 with the message of 'reduced steering assist drive with care' message appearing after vehicle startup."

— 2019 CHEVROLET TAHOE owner · ELECTRICAL SYSTEM · Filed 11/26/2018

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

📊 Complaint Trend by Model Year

1

'16

1

'19

Common Causes on CHEVROLET TAHOE

Based on NHTSA complaint component analysis for this vehicle.

UNKNOWN or OTHER 50%

ELECTRICAL SYSTEM 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 TAHOE? ▾

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

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

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

Is U0100 serious on my CHEVROLET TAHOE? ▾

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

What should I do if my CHEVROLET TAHOE 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.