CAN network

U0159 — Lost Communication with Parking Assist Control Module

Severity: low Safe to drive

What U0159 means

U0159 means one or more control modules stopped receiving messages from the parking assist module, which runs the parking sensors or surround-view cameras. Modules normally share data over a CAN bus, with each one sending its messages regularly. When the parking module's messages disappear, other modules store this code.

Symptoms

  • Park assist is disabled and gives no warnings
  • Backup camera settings are grayed out
  • A parking system warning light is on
  • Other warning lamps may come on
  • Features handled by this module are unavailable

Possible causes

  1. Failed parking assist module
  2. Damaged parking sensor wiring
  3. Damaged harness in the rear bumper
  4. CAN bus wiring fault (open, short or chafed wires)
  5. Another faulty module loading the bus
  6. Corroded connectors or terminals
  7. Power supply or ground fault at the module

How to diagnose

  1. Run a full-module scan to see which modules respond and which do not
  2. Record and clear the codes, then see whether U0159 returns
  3. Inspect the parking module connector and the rear bumper harness for damage, moisture and corrosion
  4. Check the module's power supply and ground connections
  5. Measure CAN bus resistance and voltages at the diagnostic connector
  6. Test the CAN wiring from the module to the nearest node for opens and shorts
  7. Disconnect suspect modules one at a time only if the manufacturer's procedure allows it

Common fixes

  • Repair or replace damaged wiring
  • Clean or replace corroded connectors and terminals
  • Restore the module's power and ground
  • Replace the parking assist module and program it if required
  • Replace a faulty module that is disrupting the CAN bus

Questions and answers

What does U0159 mean?

It means communication with the parking assist module was lost. Other modules are no longer receiving its messages on the data network, so the parking system usually shuts off.

Can I drive with code U0159?

Usually yes, because the engine and brakes are not affected. Just do not rely on the parking sensors or camera, and maneuver carefully.

What most often causes U0159?

Common causes are damaged wiring in the rear bumper, a corroded connector or a power supply problem at the module. If the wiring is fine, the module itself may have failed.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.