U0162 – Lost Communication With Navigation Control Module

System: Network | Standard: ISO/SAE Controlled | Fault type: General

Definition source: SAE J2012/J2012DA (industry standard)

DTC U0162 indicates a network communication problem: one or more modules on the vehicle’s data bus have detected a loss of communication with the Navigation Control Module. This is a network-level fault, not a direct statement that the navigation unit itself is defective. Depending on vehicle architecture, the navigation function may be integrated into another module or separated, and the reporting module may differ by vehicle. Communication faults can also be intermittent, triggered by power/ground disturbances or wiring issues that only occur under certain conditions. Always confirm the vehicle’s module topology, network type, and pinpoint test procedures using the correct service information before replacing any parts.

What Does U0162 Mean?

U0162 means Lost Communication With Navigation Control Module. In practical terms, a module that expects messages from the Navigation Control Module did not receive them for a calibrated period and set a diagnostic trouble code to indicate the network communication loss. SAE J2012 defines the standardized structure of DTCs, and this code belongs to the “U” (network communication) family. U0162 does not, by itself, confirm a failed navigation unit; it only confirms that expected network messaging associated with the Navigation Control Module was not detected, which can be caused by wiring, connector, power/ground, network integrity, or module-level issues.

Quick Reference

  • Subsystem: Vehicle communication network (data bus) messaging related to the Navigation Control Module
  • Common triggers: Module power/ground interruption, open/high-resistance in network wiring, short affecting the bus, connector pin fit issues, module reset or internal fault
  • Likely root-cause buckets: Wiring/connector faults, shared power/ground faults, network bus integrity issues, Navigation Control Module fault, configuration/software issues (varies by vehicle)
  • Severity: Usually non-critical for drivability, but may disable navigation/infotainment features; in some vehicles it can trigger warnings or affect related features that rely on shared data
  • First checks: Verify battery health and fuses, confirm the module powers up, inspect connectors and harness routing, check for other network DTCs, attempt module communication with a scan tool
  • Common mistakes: Replacing the Navigation Control Module without verifying power/ground and network wiring, ignoring other U-codes that indicate a broader bus problem, overlooking intermittent connector contact issues

Theory of Operation

Modern vehicles use a communication network so modules can exchange information without dedicated point-to-point wiring for every signal. The Navigation Control Module typically transmits and receives periodic messages over the data bus, and other modules use those messages for functions such as display coordination, audio prompts, time/location data sharing, or system status reporting (exact interactions vary by vehicle). The module must have stable power and ground, and the network wiring and terminations must maintain signal integrity for messages to be reliably received.

A module sets U0162 when it expects navigation-related network messages but detects that the messages are missing or invalid for longer than the allowed time. This can happen if the Navigation Control Module loses power, resets, has a poor ground, is unplugged, or if the network wiring has an open, short, or excessive resistance causing communication to drop out. Intermittent faults are common because vibration, temperature changes, or load changes can affect marginal connections.

Symptoms

  • Navigation inoperative: Maps, route guidance, or navigation menus may be unavailable or greyed out
  • Message/warning: A system message may indicate navigation is unavailable or a communication fault is present
  • Infotainment anomalies: Screen freezes, reboots, missing tiles/menus, or delayed responses (varies by vehicle integration)
  • Audio prompts missing: Guidance prompts or related audio cues may not play
  • Intermittent operation: Features may return after a restart, key cycle, or hitting bumps, then fail again
  • Multiple network DTCs: Other U-codes may appear, indicating a wider network or power/ground disturbance
  • Clock/settings issues: Time, presets, or personalization features may reset if the module is power-cycling

Common Causes

  • Open circuit, short-to-power, or short-to-ground on the network communication lines between modules (varies by vehicle network design)
  • Poor connector contact at the navigation control module or at an inline/junction connector (backed-out pin, corrosion, fretting, bent terminal)
  • Loss of power feed to the navigation control module (blown fuse, faulty relay, high resistance in the power supply path)
  • Loss of ground to the navigation control module (loose ground fastener, damaged ground splice, high resistance in ground path)
  • Intermittent harness fault (chafing, pinched wiring, vibration-related opens) affecting network or module power/ground
  • Another network node or gateway issue causing bus-off conditions or disrupted messaging (architecture and module roles vary by vehicle)
  • Navigation control module internal fault preventing it from powering up or communicating (confirm power/ground and network integrity first)
  • Software/configuration mismatch after service (module replacement, programming, or configuration not completed as required by service information)

Diagnosis Steps

Tools typically needed include a scan tool capable of full-network module discovery and reading U-codes, a digital multimeter, and access to wiring diagrams/service information for connector views, pinouts, and fuse/ground locations. A breakout lead set or back-probing tools help prevent terminal damage. If available, use a data logger function on the scan tool for capturing intermittent communication dropouts during a road test.

  1. Verify the complaint and document codes: Scan all modules, record U0162 and any additional network, battery, ignition, or gateway-related DTCs. Save freeze-frame or event data if the platform provides it, and note which modules report U0162.
  2. Check module presence on the network list: Use the scan tool’s module scan/topology view to see whether the navigation control module is detected. If it is missing, prioritize power/ground and network physical checks. If it is present, treat the issue as intermittent or message-level and continue with logging and connector checks.
  3. Assess whether the fault is current or history: Clear codes and cycle ignition per service information. Re-scan immediately and then after a short drive with the infotainment/navigation system operating. If U0162 returns quickly, proceed to circuit-level diagnostics. If it does not, plan an intermittent strategy (wiggle test and live-data logging).
  4. Rule out low-voltage events: Check for battery/charging system or ignition feed DTCs across modules. Verify battery connections are clean and tight and that major power distribution points are secure. Communication codes can be triggered by undervoltage events; correct any power supply issues before deeper network testing.
  5. Inspect fuses, relays, and wake-up feeds for the navigation module: Using service information, identify all constant power, ignition-switched power, and wake/enable circuits for the navigation control module. Confirm fuses are intact under load (not just visually) and that any related relays operate correctly.
  6. Check power and ground integrity at the navigation control module: With the module connected when possible, back-probe power and ground pins. Perform voltage-drop testing on the ground path and on the power feed path while the system is commanded on. High resistance in either path can prevent reliable communication without fully disabling the module.
  7. Perform a focused connector and terminal inspection: Disconnect the navigation control module connector(s) and inspect for pushed-out pins, bent terminals, corrosion, moisture intrusion, or poor pin fit. Inspect any inline/junction connectors on the same network branch. Repair terminal issues as needed, then re-test.
  8. Network physical-layer checks: Follow service information to identify the network pair serving the navigation control module (architecture varies by vehicle). Check for shorts to power/ground and opens in the network circuits between the module and the next connector/junction. If directed by service procedures, measure network resistance with the system powered down and modules asleep, and compare to specifications.
  9. Wiggle test for intermittents: While monitoring scan tool network status (module presence, communication DTC counters, or message-related PIDs), gently manipulate the harness near the navigation module, along routing points, and at junctions. If communication drops or U0162 resets, isolate the exact area and repair the harness/connector condition.
  10. Live-data logging and event capture: Use the scan tool to log network health indicators and relevant module data during an extended drive or operating cycle. Try to duplicate the conditions when the fault occurs (temperature, vibration, accessory load). Correlate the dropout with power/ground changes, bumps, or system wake/sleep transitions.
  11. Isolate module vs network/gateway: If power/ground and wiring test good and U0162 remains current, follow service information to determine whether the navigation control module can be temporarily isolated from the network for testing, or whether a gateway/central module is involved. If isolation changes which modules set communication codes, the fault may be upstream of the navigation module branch.
  12. Confirm repair: After repairs, clear DTCs, perform an ignition cycle, and verify the navigation control module is consistently present on the network scan. Re-check for returning U-codes after a road test and after a key-off sleep period if applicable to the platform.

Professional tip: When U0162 is intermittent, avoid replacing modules early. First prove stable power and ground with voltage-drop testing under operating load, then use scan tool logging while performing a controlled wiggle test. If the navigation control module disappears from the network list during the event, treat it as a physical-layer or power/ground dropout until proven otherwise.

Need network wiring diagrams and module connector views?

Communication stop and network faults require module connector pinouts, bus wiring routes, and power/ground diagrams. A repair manual helps you trace the exact circuit path before replacing any ECU.

Factory repair manual access for U0162

Check repair manual access

Possible Fixes & Repair Costs

Repair costs for U0162 vary widely because the same “lost communication” result can come from simple connection issues, network wiring faults, or a module power/ground problem. Parts availability, diagnostic time, and labor access also vary by vehicle and installation location.

  • Clean, reseat, and properly secure connectors related to the navigation control module and the network backbone after confirming terminal condition and correct pin fit
  • Repair or replace damaged network wiring (short to power, short to ground, open circuit, or high resistance) found during continuity and wiggle testing
  • Restore navigation control module power and ground integrity by repairing feed/ground wiring and correcting excessive voltage drop found under load
  • Correct poor ground points (loose fasteners, corrosion, paint under lugs) that affect module/network stability
  • Replace the navigation control module only after verifying power, ground, and network circuits are correct and the module remains non-communicative
  • Update or reconfigure module/software only when service information indicates it is required after verified circuit integrity

Can I Still Drive With U0162?

In many vehicles you can still drive with U0162 because it indicates a communication loss with the navigation control module, which may not affect basic propulsion. However, you should use extra caution: features that rely on navigation data or integrated displays may be unavailable or behave unpredictably. If any critical warnings appear (stalling, no-start, reduced power, brake/steering warnings, or a cascade of network faults), do not drive; diagnose and repair the network/power issue first.

What Happens If You Ignore U0162?

Ignoring U0162 can leave navigation-related features inoperative and may contribute to intermittent network instability, especially if the underlying issue is wiring damage, poor power/ground, or a developing short. Over time, the fault may become more frequent, trigger additional communication DTCs, and complicate diagnosis by creating multiple secondary symptoms across modules.

Compare nearby lost navigation trouble codes with similar definitions, fault patterns, and diagnostic paths.

  • U0156 – Lost Communication With Navigation Display Module
  • U017D – Lost Communication With Control Module “M”
  • U017C – Lost Communication With Control Module “L”
  • U017B – Lost Communication With Control Module “K”
  • U017A – Lost Communication With Control Module “J”
  • U0179 – Lost Communication With Control Module “I”

Key Takeaways

  • U0162 means the vehicle detected a loss of communication with the navigation control module, not a confirmed module failure.
  • Most successful repairs start with verifying module power/ground and network connector integrity before replacing parts.
  • Intermittent opens, high resistance, and poor terminal fit can cause sporadic “lost communication” events.
  • Multiple network DTCs often indicate a shared wiring, grounding, or bus-level problem rather than a single bad module.
  • Confirm the root cause with circuit tests and service information before module replacement or programming actions.

Vehicles Commonly Affected by U0162

  • Vehicles with a separate navigation control module connected to the main vehicle network
  • Vehicles where navigation functions are integrated into a shared infotainment/display network segment
  • Vehicles with multiple network buses linked through a gateway module (where navigation is on a sub-network)
  • Vehicles with dash-mounted modules subject to connector stress from trim movement or prior service work
  • Vehicles with trunk/rear-compartment mounted modules where harness routing and grounds are exposed to wear
  • Vehicles that have had aftermarket electrical accessories installed near network wiring (installation quality varies)
  • Vehicles with recent battery replacement, low-voltage events, or jump-start history that can expose marginal connections
  • Vehicles with prior collision/body repairs affecting harness routing, ground points, or connector seating

FAQ

Does U0162 automatically mean the navigation control module is bad?

No. U0162 only indicates that other modules reported a loss of communication with the navigation control module. The root cause can be a power/ground issue, an open or short in the network wiring, poor terminal contact, or the module itself. Testing is required to confirm the failure.

Why does U0162 sometimes come and go?

Intermittent communication losses are commonly caused by marginal connector contact, harness movement, vibration, or a developing wiring fault that opens under certain conditions. A weak power or ground connection can also cause the module to reset sporadically, which looks like a communication drop to the network.

Can low battery voltage trigger U0162?

Yes, it can contribute. A low-voltage event can cause modules to reset or drop off the network, and the result may be logged as lost communication. If battery/charging issues are suspected, verify system power stability and then re-check whether U0162 returns.

What should I check first to avoid unnecessary parts replacement?

Start by verifying the navigation control module’s power and ground under load (including voltage-drop testing), then inspect and reseat network connectors for terminal damage or poor pin fit. If communication is intermittent, perform a wiggle test while monitoring network status and module presence in scan-tool data.

Will clearing U0162 fix the problem?

Clearing the code may temporarily remove the warning, but it will not correct the underlying cause of the communication loss. If the wiring, power/ground, or module issue remains, U0162 will typically reset after the monitor runs again or when the fault condition reoccurs.

For a lasting repair, focus on verifying network integrity and stable module power/ground, then correct the specific fault found by testing.