U0100 on Chevrolet Equinox
Lost Communication With ECM/PCM A
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Chevrolet Equinox context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for U0100.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
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.
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."
"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."
"I was driving about 20 miles per hour when all the gauges on the dash board went crazy."
"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."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Chevrolet Equinox
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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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.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.