U0100 Fault Code — Lost Communication with ECM/PCM

Severity: 🔴 Critical — stop driving immediately

Scan tool or other modules cannot communicate with the ECU.

Can You Drive With This Code?

No. Don't drive — without ECM communication, gearbox, ABS and stability systems fall back to default values. Tow to workshop.

Common Symptoms

Common Causes

How We Fix It

Check ECU power supply, ground, and CAN bus wiring before condemning ECU.

Repair Cost in Hyderabad

₹4,500–₹85,000

Frequently Asked Questions

What does U0100 mean?

U0100 (Lost Communication with ECM/PCM) means Scan tool or other modules cannot communicate with the ECU. Common symptoms include no scanner communication, multiple module faults, car may not start.

How much does U0100 repair cost in Hyderabad?

At GarageNation Hyderabad, U0100 repair typically costs ₹4,500–₹85,000. We always diagnose first and give a fixed quote before any work begins.

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