U0162

Code

Generic U — Network/User

Lost Communication With Navigation Display Module

Brand: Generic

Type: U — Network/User

Views: UK: 30 EN: 73 RU: 34

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty or disconnected wiring between navigation display and bus
Loose, corroded or damaged connector at navigation display or gateway module
Blown fuse or no power/ground to the navigation display
CAN bus short, open, high resistance or missing termination
Other module on bus in bus-off state or network fault
Software/firmware incompatibility or module internal failure

Symptoms

Navigation screen blank, frozen, or unresponsive
Navigation features unavailable or error message about module
Other infotainment features may be affected
DTC U0162 stored in gateway or body control module
Intermittent behavior (works sometimes, then communication lost)

What to check

Read stored and pending codes from all modules; note freeze frame and related U-codes
Check for other U-codes (lost communications with other modules) to identify a network-wide issue
Verify battery voltage nominal (11–14.5 V) at vehicle and at navigation display
Inspect fuses and power feeds for the navigation display
Visually inspect connectors and wiring at the navigation display and gateway/module for damage or corrosion
Back-probe or disconnect connector and check for solid ground (close to 0 Ω) and power presence

Signal parameters

Battery voltage at module power pin: typically 11–14.5 V
Ground continuity: low resistance to chassis/vehicle ground (
CAN bus idle voltages (recessive): CANH ≈ 2.5 V, CANL ≈ 2.5 V
CAN bus dominant state (active): CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ~1.5–3.0 V depending on transceivers)
Bus termination resistance (power off): ≈ 60 Ω typical (two 120 Ω resistors in parallel)
No communication / no CAN frames from navigation display when monitoring with a capable scan tool or scope

Diagnostic algorithm

Connect a capable scan tool; read all modules and record U0162 plus any additional U-codes or freeze frame data.
Confirm symptoms (blank screen, errors). Check for recent repairs or aftermarket installs that could affect wiring.
Verify vehicle battery voltage and inspect fuses/power distribution for the navigation display circuit. Repair any power issues.
Visually inspect connectors/wiring at the navigation display and any intermediate modules (gateway, BCM). Unplug and inspect pins for corrosion or damage.
Back-probe the display connector: verify proper power and ground presence and measure CANH/CANL idle voltages per signal parameters.
With a scan tool or oscilloscope monitor CAN traffic. Verify other modules are transmitting and whether the navigation display sends any frames. If entire bus is dead, trace to gateway and check termination.
Measure termination resistance between CANH and CANL with ignition off; repair open or incorrect termination.
Perform wiggle tests and isolate sections of harness to reproduce the fault; check for intermittent opens or shorts.
If wiring and power/ground are good and bus traffic is correct but the display does not communicate, attempt software reflash/update per manufacturer service procedures if available.
If reflashing fails and all wiring/network checks are good, consider replacing the navigation display module. Reprogram/configure replacement per manufacturer instructions.
Clear codes and verify repair by monitoring for return of U0162 and confirming normal operation during a road test or extended scan-tool session.