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DTC codes / U01xx · Lost communication with a control module / U0162

U0162Lost Communication With Navigation Display Module

U0162 means the vehicle's main communication network has lost contact with the navigation display module, which is the screen and control unit for the infotainment and navigation system. The computer that monitors the network, typically the body control module or gateway, has stopped receiving the periodic status messages it expects from that module over the Controller Area Network (CAN) bus.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaLost communication with a control module

Symptoms you may notice

  • The navigation or infotainment screen stays black, freezes, or reboots intermittently
  • Touch controls, map display, and audio functions from the screen stop responding
  • A warning light or message on the instrument cluster indicating a communication or system fault
  • Other modules that share the same network may log communication codes or behave erratically
  • Often no symptoms besides the warning light if the module still powers up but its network messages are intermittent

Common causes, most likely first

  1. Blown fuse or poor power/ground connection at the navigation display module
  2. Damaged, corroded, or loose wiring and connectors in the CAN bus circuit to the display
  3. Failed navigation display module internal electronics or software crash
  4. CAN bus network fault such as a shorted or open data line affecting multiple modules
  5. Gateway or body control module issue that prevents messages from reaching the display
  6. Low battery voltage or charging system problem causing modules to drop offline intermittently

How to diagnose and fix it

  1. Check for any related communication codes in all modules and record them before clearing anything
  2. Verify battery voltage and charging system output, then inspect and test the fuse and power/ground at the navigation display module
  3. Inspect the CAN bus wiring and connectors between the display and the network for damage, corrosion, or loose pins
  4. Measure CAN bus resistance and voltage at the display connector to confirm the network is intact
  5. If wiring and power are good, perform a software update or reset on the navigation display module where the manufacturer supports it
  6. Substitute a known-good navigation display module or bench-test the original to confirm internal failure
  7. After repair, clear codes and drive the vehicle through a complete ignition cycle to verify communication is restored

Why the screen may not be the real culprit

  • A dead navigation display often gets replaced when the actual fault is a corroded connector or a chafed CAN wire behind the dashboard, so always prove the wiring before condemning the module.
  • U0162 can set intermittently from a weak battery or poor ground even when the display works perfectly, so check voltage and grounds before any parts replacement.
  • Because the navigation display shares the network with many other modules, a single shorted module elsewhere on the bus can take the display offline and set this code.
  • Some vehicles set U0162 after a failed software update or a module that is awake but not transmitting, which a simple battery disconnect and relearn may resolve.
  • Do not assume the code means the screen is broken; a module that powers on but cannot communicate will still show a blank or frozen display and set the same code.

Can I keep driving with U0162?

The vehicle usually remains safe to drive because the navigation display is not a safety-critical system, but you should avoid relying on it for directions or rear camera views. If the warning light is accompanied by other communication codes or drivability symptoms, have the network diagnosed promptly rather than continuing to drive.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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