Home›Trouble Codes›U0158

U0158 — Lost Communication Head Up Display

Generic OBD-II · all makesNetwork / communication

Code U0158 indicates that a control module has lost communication with the Head Up Display (HUD) module. This typically occurs when the network signal between the vehicle's gateway or instrument cluster and the HUD unit is interrupted.

Symptoms

What causes it — most likely first

1. Power Supply Failure

A blown fuse or failed relay preventing the HUD module from powering on and communicating.

2. Wiring Issues

Damaged, frayed, or corroded wiring in the communication network (CAN bus) or loose connectors at the HUD module.

3. HUD Module Internal Failure

An internal hardware or software fault within the HUD module that prevents it from responding to network requests.

4. Gateway or Cluster Fault

A failure in the instrument cluster or gateway module that manages the data flow to the HUD.

5. Control Module Failure

A fault in the primary vehicle control module, though this is highly unlikely for a HUD-specific communication error.

How it's diagnosed

  1. Verify if the HUD is completely unresponsive or intermittently failing
  2. Check the fuse box for any blown fuses associated with the HUD or interior electronics
  3. Inspect the HUD module connectors for secure seating and signs of corrosion
  4. Perform a continuity and voltage test on the power and ground circuits at the HUD module
  5. Use an oscilloscope or multimeter to check for CAN bus activity at the HUD connector
  6. Scan for other U-series communication codes to determine if the fault is isolated to the HUD or is a wider network failure

Code facts & related codes

SystemNetwork / communication
StandardizationSAE generic — identical on every make
Related codesU0150 — Lost Communication Serial Data GatewayU0151 — Lost Communication Restraints Control U0152 — Lost Communication Side Restraints ConU0153 — Lost Communication Side Restraints ConU0154 — Lost Communication Restraints OccupantU0155 — Lost Communication Instrument Panel Cl

Frequently asked

Does U0158 mean the HUD projector bulb is burnt out?

No. This is a communication code, meaning the system cannot 'talk' to the module, regardless of whether the projector itself is functional.

Is it safe to drive with this code?

Yes. The HUD is a convenience feature and does not affect the mechanical operation or safety of the engine or drivetrain.

Should I replace my engine computer (PCM) to fix this?

No. It is extremely rare for the PCM to be the cause of a U0158 code; the issue is almost always located within the HUD module, its wiring, or the interior network.