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

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

"U0100 indicates: Lost Communication With ECM/PCM A. This is a network communication code. 4 CHEVROLET EQUINOX owners have reported this to NHTSA."

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

"Based on 4 NHTSA reports, the most commonly cited components are: Service Brakes, Hydraulic,Power Train,Electrical System, Electronic Stability Control (Esc), Power Train,Vehicle Speed Control,Engine. These percentages are based on the component field in owner complaints."

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

"Of 4 NHTSA reports for this code on CHEVROLET EQUINOX, 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 EQUINOX 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 EQUINOX

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.

4 CHEVROLET EQUINOX owners have reported this issue to NHTSA across model years 2006-2019. Most reports come from the 2006, 2010 model years.

Real CHEVROLET EQUINOX Owner Reports

Source: NHTSA Complaints Database

"(1) on or about 10/27/06, alarm system deactivated itself, interior and exterior lights turned on, doors remained locked. (2) on 11/01/06, alarm system activated itself, doors locked themselves."

— 2006 CHEVROLET EQUINOX owner · SERVICE BRAKES, HYDRAULIC,POWER TRAIN,ELECTRICAL SYSTEM · Filed 11/27/2006

"While driving 55mph, the check engine light appeared on the display. shortly after, a message reading "service stabili trak" appeared. then, another message appeared "engine power reduced". my car started shaking fiercely and i could not go above 30mph."

— 2010 CHEVROLET EQUINOX owner · ELECTRONIC STABILITY CONTROL (ESC) · Filed 01/02/2015

"I was driving about 20 miles per hour when all the gauges on the dash board went crazy."

— 2012 CHEVROLET EQUINOX owner · POWER TRAIN,VEHICLE SPEED CONTROL,ENGINE · Filed 07/07/2015

"While on vacation traveling on 81s in va & doing 70 mph on the 3-lane hwy., without a warning a power reduction message appeared on the dash; then the check engine light came on. our vehicle went from 70 mph (posted speed) to 40 mph. in a matter of seconds."

— 2019 CHEVROLET EQUINOX owner · VEHICLE SPEED CONTROL,ENGINE · Filed 06/02/2019

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

📊 Complaint Trend by Model Year

1

'06

1

'10

1

'12

1

'19

Common Causes on CHEVROLET EQUINOX

Based on NHTSA complaint component analysis for this vehicle.

SERVICE BRAKES, HYDRAULIC,POWER TRAIN,ELECTRICAL SYSTEM 25%

ELECTRONIC STABILITY CONTROL (ESC) 25%

POWER TRAIN,VEHICLE SPEED CONTROL,ENGINE 25%

VEHICLE SPEED CONTROL,ENGINE 25%

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 EQUINOX? ▾

U0100 indicates: Lost Communication With ECM/PCM A. This is a network communication code. 4 CHEVROLET EQUINOX owners have reported this to NHTSA.

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

Based on 4 NHTSA reports, the most commonly cited components are: Service Brakes, Hydraulic,Power Train,Electrical System, Electronic Stability Control (Esc), Power Train,Vehicle Speed Control,Engine. These percentages are based on the component field in owner complaints.

Is U0100 serious on my CHEVROLET EQUINOX? ▾

Of 4 NHTSA reports for this code on CHEVROLET EQUINOX, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my CHEVROLET EQUINOX 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.