U0158 — Data Bus: Head-Up Display – No Communication #

Note: The wording of this code may vary depending on the vehicle’s manufacturer (OEM). Always refer to your service manual.

• Data Bus: Head-Up Display – No Communication (Generic, most brands)
• Lost Communication With Head-Up Display Module (General Motors)
• No Communication With HUD Control Module (BMW, Mercedes-Benz)
• Head-Up Display Module Not Responding (Ford, Lincoln)

Summary of the U0158 Code #

The diagnostic trouble code U0158 indicates that the vehicle’s primary communication network, known as the Controller Area Network (CAN) bus, has lost contact with the Head-Up Display (HUD) module. The HUD is the system that projects key driving information onto the windshield, keeping your eyes on the road. When this code sets, it means the main computer (often the Body Control Module, BCM, or Instrument Cluster) can no longer “talk” to the HUD. This loss of communication usually points to wiring, connection, or power issues, but may sometimes be caused by a failed module.

U0158 is considered a network communication fault and is not limited to one specific make or model. However, it is more common on vehicles equipped with a factory or OEM HUD system. Resolving this code is crucial for restoring full driver information display and, in some cases, other integrated safety features.

Common Symptoms for U0158 #

When the U0158 code is present, the most obvious symptom is a non-functional or blank HUD. However, depending on your vehicle, you may notice additional issues, since the HUD often shares information with other modules. Here’s what to look for:

• Head-Up Display does not turn on or remains blank
• Warning lights for “HUD malfunction” or “Display error” on the instrument cluster
• Loss of speed, navigation, or warning data on the windshield
• Chime or alert sound at startup indicating display failure
• In rare cases, loss of some advanced driver assistance features

Probable Causes for U0158 (from most to least likely) #

There are several reasons why your vehicle might set a U0158 code. These range from simple wiring concerns to a failed HUD module itself. The most frequent causes, in order, are:

1. Loose, damaged, or corroded wiring/connectors at the HUD module or along the CAN bus
2. Faulty or disconnected HUD module
3. Blown fuse or missing power/ground supply to the HUD
4. CAN bus network fault (shorted or open circuit somewhere in the network)
5. Software or firmware glitch in the HUD or BCM
6. Aftermarket accessories interfering with CAN bus signals

Step-by-Step Diagnosis for U0158 #

Diagnosing a U0158 code requires a methodical approach, as network issues can be elusive. Here is a proven workflow to identify the root cause efficiently:

• 1. Verify the code: Use a professional scan tool to confirm the U0158 is active, and check for other related network or module codes.
• 2. Visual inspection: Examine the HUD module area and associated wiring for signs of damage, water intrusion, or loose connections.
• 3. Check power and ground: With a multimeter, confirm the HUD module is receiving proper voltage and has a good ground connection.
• 4. Inspect CAN bus lines: Measure resistance across CAN-high and CAN-low wires at the HUD connector (should be ~60 ohms with ignition off and modules connected). Look for pinched, shorted, or broken wires between the HUD and the main network.
• 5. Test communication: Attempt to communicate with the HUD module using a scan tool. If there is no response, disconnect the module and see if CAN network function returns to normal.
• 6. Substitute known-good parts: If available, swap in a functional HUD module or BCM to confirm hardware failure before replacement.
• 7. Reprogram or update: If all hardware checks out, consult OEM service information for possible software updates or reprogramming procedures.

Possible Repairs for U0158 #

The best repair depends on what you find during diagnosis. Here are solutions matched to the most likely causes:

• Repair or replace damaged wiring/connectors at the HUD or along the CAN bus. Clean corrosion and secure all plugs.
• Replace the HUD module if confirmed faulty (no communication even with power/ground present).
• Replace blown fuse or restore power/ground supply to the HUD circuit.
• Repair CAN bus faults (splice or replace shorted/open wires, repair network issues).
• Remove or rewire interfering aftermarket accessories (alarm, remote start, audio upgrades) that may disrupt the CAN network.
• Perform OEM software updates or reprogramming as directed by service bulletins.

Is It Safe to Drive with U0158? #

You can usually drive your vehicle with a U0158 code, but with limitations. The main risk is loss of the HUD’s important driving information, which may affect your situational awareness—especially if you rely on it for navigation or speed monitoring. If your car displays additional warning lights or other safety systems are affected, it’s best to have it checked promptly. For most drivers, U0158 is not an immediate “stop driving” fault, but leaving it unresolved can reduce your driving comfort and safety.

Vehicles Most Commonly Affected by U0158 #

The U0158 code is seen in vehicles equipped with a factory (OEM) head-up display. It is more commonly reported in:

• BMW (3 Series, 5 Series, X5, X6)
• General Motors (Chevrolet Corvette, Cadillac CT6, Escalade, GMC Yukon Denali)
• Mercedes-Benz (S-Class, E-Class)
• Ford/Lincoln (Navigator, Aviator)
• Hyundai/Kia (Genesis, Palisade, K900)
• Honda/Acura (Accord, TLX, MDX)
• Toyota/Lexus (Highlander, RX, LS)

Note: This is not an exhaustive list; any modern car with an OEM HUD may develop a U0158 code.

Common Mistakes & Best Practices for U0158 #

Head-up display communication faults can be tricky. Avoid these pitfalls, and follow industry best practices:

• Assuming the HUD module is bad without checking power, ground, and network continuity first
• Overlooking blown fuses or poor ground connections related to the HUD circuit
• Ignoring water leaks or corrosion around the windshield area (a frequent cause of connector damage)
• Not using a scan tool with OEM-level network diagnostics
• Skipping a network reset or module reprogram after repairs
• Failing to check aftermarket devices that may tap into the CAN bus

U0158 FAQ Express #

Every workshop gets a few recurring questions about the U0158 code. Here are quick answers:

• Q: Will clearing the code with a scanner fix the issue?
• A: No. If the underlying fault remains, the code will return. The root cause must be repaired.
• Q: Can I install a used HUD from another vehicle?
• A: Sometimes, but many HUD modules require programming or coding to your car’s VIN by the dealer or with specialized tools.
• Q: Why did this code appear after a windshield replacement?
• A: HUD wiring or connectors may have been disturbed, pinched, or not reconnected properly during the repair. A careful inspection is needed.