MazicBay Diagnostics
MAZICBAYDiagnostics
Lookup DTC
FTC Reader Disclosure: When you purchase or register through links on our site, we may earn an affiliate commission at no extra cost to you. Read our Editorial & Advertising Policy.

U0102 on Dodge: Symptoms, Causes & Fix

Lost Communication with Transfer Case Control Module (TCCM)

Official technical diagnostic wire for fault code U0102 specifically affecting Dodge vehicles (Charger, Challenger, Durango, Hornet, Journey).

Sensor Voltage Ref
0.1V – 5.0V Ref
Dodge Factory Standard
CAN Bus Speed
500 kbps CAN-FD
ISO 15765-4 Diagnostic Bus
Drivability Status
Drivable (Short Trip)
Medium urgency level
Est. Repair Cost
$150 - $650 (DIY: $50 - $220)
Parts & Labor DIY
Model-Specific Diagnostic Wires

Select Your Dodge Model for U0102:

4 Models Available
Dodge Charger2020–2026
Dodge ChargerSedan • 5.7L / 6.4L 392 HEMI / 6.2L Hellcat (717HP–797HP) / Hurricane 3.0L Turbo
U0102 Fix & DLC Location
Dodge Challenger2020–2026
Dodge ChallengerCoupe • 3.6L Pentastar V6 (305HP) / 5.7L HEMI V8 / 6.2L Redeye Widebody (807HP)
U0102 Fix & DLC Location
Dodge Durango2021–2026
Dodge DurangoSUV • 3.6L Pentastar V6 (293HP) / 5.7L HEMI V8 (360HP) / 6.4L 392 SRT (475HP)
U0102 Fix & DLC Location
Dodge Hornet2023–2026
Dodge HornetSUV • 2.0L Turbo (265HP) / R/T PHEV (288HP / eAWD)
U0102 Fix & DLC Location

1. Common Symptoms on Dodge Vehicles

When Dodge Engine Control Modules (ECM) trigger fault code U0102, drivers typically report:

'Service 4WD' or '4WD System Error' message on dash on Dodge Powertrains
4WD selector switch unresponsive (lights out on switch) on Dodge Powertrains
Vehicle stuck in 2WD or last selected 4WD mode on Dodge Powertrains

2. Root Causes on Dodge Engines

Historical diagnostic claims across Dodge engines point to the following failure distribution:

55%
Corroded TCCM power/ground wiring under vehicle (Dodge OEM Part)
25%
Blown 4WD / TCCM fuse in engine fuse panel (Dodge OEM Part)
12%
Faulty Transfer Case Control Module (Dodge OEM Part)
8%
Faulty transfer case shift encoder motor (Dodge OEM Part)

3. Step-by-Step Fix Protocol for Dodge

01
Check 4WD / TCCM Fuses

Inspect ATC / 4WD fuses with test light. on Dodge engines.

Required Tool: Test Light
02
Inspect TCCM Connector

Check module under driver dash or seat for water intrusion. on Dodge engines.

Required Tool: Flashlight
03
Test CAN Bus Wires at TCCM

Verify 2.5V CAN signals reach the module. on Dodge engines.

Required Tool: Multimeter
04
Replace TCCM & Clear Codes

Install replacement module and clear trouble codes. on Dodge engines.

Required Tool: Socket Set, Scan Tool
Recommended Parts & Testing Tools

Equipment for Diagnosing Dodge (U0102)

Prime Fast Delivery & Verified Fitment
Direct-Fit Replacement Part

Dodge OEM Replacement Sensor

4.7 / 5.0 (Verified Fit)

Direct-fit replacement assembly engineered to OEM tolerances for Dodge.

$45 – $95 Prime
Check Fitment on Amazon
Sensor Signal Voltage Meter

AstroAI Auto-Ranging Digital Multimeter

4.6 / 5.0 (Best Seller)

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

$29.99 Prime
View on Amazon
Top Mobile OBD-II Scanner

BlueDriver Bluetooth Pro OBDII Scan Tool

4.7 / 5.0 (50,000+ Reviews)

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

Compare OEM & Aftermarket Replacement Sensors for DodgeVerified direct-fit pricing from Denso, Bosch, Motorcraft, and ACDelco on Amazon.
Find Parts on Amazon
* As an Amazon Associate, MazicBay earns from qualifying purchases. Prices & availability subject to change.

4. Dodge U0102 Frequently Asked Questions

What does code U0102 mean on a Dodge?

On Dodge vehicles, U0102 indicates that the Engine Control Module (ECM) detected lost communication with transfer case control module (tccm). This typically points to Corroded TCCM power/ground wiring under vehicle or Blown 4WD / TCCM fuse in engine fuse panel.

Can I continue driving my Dodge with code U0102?

Yes, in 2WD. 4WD and Auto 4x4 functions will be inoperative. Because this code carries a Medium severity rating on Dodge powertrains, we recommend scanning live data values promptly to prevent secondary damage.

How much does it cost to fix code U0102 on a Dodge?

Estimated DIY parts cost ranges from $150 - $650 (DIY: $50 - $220), while professional shop repairs at an authorized Dodge dealership or independent specialist typically range from $180 to $380 including diagnostic labor.