Safety Warning

Steering SystemCritical

Do not drive. Have vehicle towed to a mechanic.

Coolant Leak

Monitor temperature gauge. Do not drive if overheating.

Based on owner reports. Always prioritize safety and consult a qualified mechanic.

Back to U0100 Overview

How to Diagnose U0100

10 owner reports5 diagnostic steps~30-60 min estimated time

DIY Diagnostic Checklist

Based on 10 owner reports

Progress0%

Tools Needed

OBD Scanner
Step 1check: connections
Step 2check: engine light came on after the highway event and stayed on
Step 3check: engine light remained on
Step 4check: engine light remains on due to stored/permanent codes
Step 5check: engine light was left on

Root Causesfor U0100

Based on 10 owner reports

Confirmed Causes

  • 1
    stored/permanent codes(10% of cases)

What Didn't Help

Repairs that owners tried but didn't fix the issue

able to fix it and towed it to the mechanichave any of the symptoms occur on my entire ride homeoccurring

Things to Check

Suggested areas to investigate based on similar cases

connectionsengine light came on after the highway event and stayed onengine light remained onengine light remains on due to stored/permanent codesengine light was left onerased the codes

U0100

Lost Communication With ECM/PCM A

lowView full code details →

Required Tools

  • OBD Scanner