U0102: Lost Communication With Transfer Case Control Module

Severity

low

NHTSA Reports

Vehicles Affected

System

Powertrain

Last reviewed: Aug 8, 2026 Last updated: Aug 8, 2026

Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to generic code level because this page is not scoped to one make or model.

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 U0102.
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 Does U0102 Mean?

U0102 code: Lost Communication With Transfer Case Control Module. Symptoms, likely causes, diagnostic path, severity, and repair cost context.

Symptoms of U0102

⚠️ Warning light or diagnostic trouble code is stored
⚠️ Multiple warning lights, communication faults, no-start, or intermittent module messages may occur
⚠️ Symptoms may change depending on battery voltage and network wake/sleep state
⚠️ Vehicle may fail an emissions or safety inspection until the code is resolved and monitors reset

Common Causes

🔍 CAN/LIN network communication loss, module offline, low battery voltage, or gateway issue
🔍 Wiring, connector, water intrusion, ground, or aftermarket accessory interference
🔍 Module programming or replacement issue requiring service-manual procedures

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"Multiple warnings lights from advanced drivers assistance 4x4 went accelerate and could not error code u0102 also rattling from right second row seat."
— Ford Explorer owner, 2024-10-15

Source: NHTSA Complaints Database

Most Reported Vehicles for U0102

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	FORD EXPLORER

Frequently Asked Questions

Is U0102 enough to replace a part?

No. The code identifies the circuit or system that failed a test, but live data, freeze-frame data, wiring checks, and related codes are needed before replacing parts.

Can I drive with U0102?

It depends on the warning lights and symptoms. Avoid driving if the code is tied to air bags, brakes, severe drivability, overheating, smoke, fuel smell, or reduced power.

What To Do Next

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.