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Home/DTC Codes/Toyota/4Runner/2003-2009 4.7L V8/U0138
U0138

Lost Communication with All Terrain Control Module

2003-2009 Toyota 4Runner 4.7L V8

Moderate SeverityNetworkGeneric (SAE)

Description

Cannot communicate with the off-road or terrain management control module.

Symptoms

  • Off-road mode not available
  • Terrain select not working
  • 4WD features limited
  • Terrain response warning

Common Causes

  • Terrain module failure
  • CAN bus wiring
  • Module power loss
  • Fuse blown

Diagnostic Steps

  1. Check terrain module fuse
  2. Test power and ground
  3. Check CAN wiring
  4. Test terrain mode switch
  5. Scan for terrain module DTCs

Repair Notes

Check fuses and mode selector switch. Module may be integrated with transfer case controller.

Related Codes

U0102Lost Communication with Transfer Case Control ModuleU0114Lost Communication with 4WD Clutch Control Module

Other Network Codes

U0138 on Other Vehicles

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2003-2009 4.0L V6

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Common Questions

What does code U0138 mean on a 2003-2009 Toyota 4Runner?

U0138 stands for "Lost Communication with All Terrain Control Module". Cannot communicate with the off-road or terrain management control module.

What are the symptoms of U0138 on a Toyota 4Runner?

Common symptoms of U0138 include: Off-road mode not available, Terrain select not working, 4WD features limited, Terrain response warning.

What causes U0138 on a 2003-2009 Toyota 4Runner?

Common causes of U0138 include: Terrain module failure, CAN bus wiring, Module power loss, Fuse blown.

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