How much does it cost to fix U0101?

Typical repair cost is $100–$1,000.

U0101 — Lost Communication with TCM

High Severity · Network

OBD-II code U0101 means your vehicle's ECU detected: Lost Communication with TCM. Below: causes, step-by-step fixes, and repair cost — free, no signup needed.

High severity — do not ignore. Get a diagnosis promptly to avoid further engine damage.

Typical Repair Cost

$100–$1,000

Parts + labor, national average

Severity

High

Address as soon as possible

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Common Causes of U0101

CAN bus fault
Failed TCM
Wiring issue

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How to Fix Code U0101

Check TCM power/ground

Inspect CAN wiring

Test/replace TCM

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FAQ — Code U0101

What does OBD-II code U0101 mean?

U0101 means your vehicle's onboard computer detected: Lost Communication with TCM. This is a high-severity code in the Network category.

How much does it cost to fix code U0101?

Typical repair cost for U0101 is $100–$1,000 including parts and labor. Costs vary by vehicle make, model, and location. A free scan at AutoZone or O'Reilly is a good first step.

Can I drive my car with code U0101?

Code U0101 is high severity. Avoid long drives until diagnosed — continued driving can cause additional engine damage.

What are the most common causes of U0101?

The most common causes are: CAN bus fault, Failed TCM, Wiring issue. Always start with the cheapest diagnosis step before replacing parts.

Will code U0101 clear itself?

Code U0101 will clear itself after the underlying issue is fixed and the ECU completes several successful drive cycles. Clearing it without fixing the root cause only masks the problem temporarily.

Is U0101 showing on your car?

Enter your VIN for a free vehicle-specific report — recalls, specs, and market value. No signup required.

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Related Network Codes

U0100Lost Communication with ECM/PCM U0121Lost Communication with ABS Control...U0155Lost Communication with Instrument Panel...

OBD-II code data is based on SAE J2012 standards and general repair industry data. Repair costs are national averages and vary by vehicle, location, and shop. Always consult a qualified mechanic for a diagnosis specific to your vehicle.