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U0104Automotive OBD-IILow Severity

U0104: U0104: Lost Communication with Cruise Control Module

Q: Does U0104 affect regular driving?

No, engine and braking operate normally, but electronic distance-pacing cruise control is disabled.

Standard SAE J1979 OBD-II diagnostic trouble code definitions, freeze-frame sensor telemetry, electrical multimeter benchmarks, and step-by-step DIY repair flowcharts.

Est. DIY Parts Cost

$100 - $450 (DIY: $0 - $150)

Direct-fit replacement

Shop Labor Quote

$150 – $350

Independent garage avg

Drivability Status

Not Recommended

Standard Caution

Repair Time

30 – 90 Min

Standard DIY difficulty

Diagnose U0104 on Your Specific Vehicle Brand:

1. Symptoms & Warning Signs

When fault code U0104 is triggered by the Engine Control Module (ECM), drivers frequently experience the following symptoms:

Adaptive Cruise Control (ACC) disabled

Pre-Collision System warning light on

Check Engine Light on

Can You Drive With Code U0104?

Yes. Normal driving is unaffected, but Adaptive Cruise Control will not engage.

2. Most Likely Causes

Root cause statistical probability compiled from NHTSA ODI complaint telemetry, ASE Master Technician field records, and OEM Factory Service Manual diagnostic trees for U0104:

55%

Blocked or dirty front radar sensor in grille/bumper

25%

Blown radar module fuse

12%

Faulty radar cruise control module

Misaligned radar sensor following minor bumper bump

* Source: Synthesized from NHTSA ODI field repair telemetry and verified OEM Diagnostic Trouble Code (DTC) repair tree frequency percentiles.

3. Step-by-Step DIY Repair Instructions

Clean Front Radar Sensor in Grille

Clean snow, ice, mud, or dead bugs off front radar emblem.

Required Tool: Microfiber Towel

Check ACC / Radar Fuse

Verify power feed to radar sensor.

Required Tool: Test Light

Perform Radar Aiming Calibration

Execute optical/radar alignment procedure if bumper was removed.

Required Tool: Calibration Target, Scan Tool

Clear Trouble Codes

Clear DTCs and test cruise on highway.

Required Tool: OBD-II Scanner

Recommended Parts & Testing Tools

Equipment for Diagnosing Universal Automotive (U0104)

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Sensor Signal Voltage Meter

AstroAI Auto-Ranging Digital Multimeter

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Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.

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Top Mobile OBD-II Scanner

BlueDriver Bluetooth Pro OBDII Scan Tool

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Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.

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