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Home / DTC / U0159 — Lost Communication With Parking Assist Control Module

U0159 — Lost Communication With Parking Assist Control Module

Detailed page for trouble code U0159.

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22,491specific
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Code

U0159

HYUNDAI U — Network/User

Lost Communication With Parking Assist Control Module

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or disconnected Parking Assist Control Module (PAM)
  • Loss of module power (blown fuse, open power feed, low battery voltage)
  • Poor or missing ground at the module
  • Damaged, corroded or disconnected CAN/LIN wiring or connectors
  • Short to battery or short to ground on CAN lines
  • Open or high-resistance termination (missing/failed 120Ω resistors or poor splice)

Symptoms

  • Parking assist / park assist warning displayed on dash
  • Parking sensors or automatic parking inoperative
  • Related messages such as 'Parking Assist Unavailable' or 'Check Parking System'
  • Multiple modules reporting communication faults
  • Intermittent or permanent loss of parking assist functions
  • Possible illumination of general warning lamp or ABS/traction warnings if integrated

What to check

  • Scan vehicle with a capable diagnostic tool; record U0159 and any other U-codes
  • Verify battery voltage (should be ~12.6V at rest, >12V while cranking; >13.5V when running)
  • Visually inspect fuses and fusible links related to parking assist and instrument network
  • Inspect parking assist module connector for corrosion, bent pins, water intrusion or damage
  • Check module ground(s) for corrosion and secure connection; measure ground resistance
  • Backprobe module power pin(s) for proper key-on and battery feed voltages

Signal parameters

  • Battery/ignition feed to PAM: nominal 9–16 V (key-on/run ~11–14.5 V)
  • Module ground: near 0 Ω to chassis; voltage at ground pin
  • CAN bus idle voltages: CAN_H ≈ 2.5 V (typical 2.5 ±0.5 V), CAN_L ≈ 2.5 V (typical 2.5 ±0.5 V)
  • CAN dominant state (active data): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
  • Termination resistance (CAN_H to CAN_L): ≈ 60 Ω (two 120 Ω terminators in parallel)
  • Common-mode voltage between CAN pair and chassis: typically ~2.5 V

Diagnostic algorithm

  1. Capture all stored codes and freeze frame data. Do not clear codes until documented.
  2. Check battery state of charge and charging system. Low voltage can cause module dropout.
  3. Inspect fuses and relays for the parking assist module and related controller/gateway. Replace any blown fuses and test again.
  4. Visually inspect the PAM connector and wiring harness for corrosion, bent pins, water entry, or physical damage. Repair as needed.
  5. Backprobe the PAM power and ground pins with ignition on. Confirm proper supply voltage and robust ground.
  6. With a scan tool, attempt to communicate with the PAM. Verify whether the module appears on the network or is absent.
  7. Measure CAN_H and CAN_L at the PAM connector with key ON. Confirm idle and active voltages and check for short to battery/ground.
  8. Measure termination resistance across CAN_H and CAN_L at the PAM connector (~60 Ω). If out of range, inspect termination resistors and wiring.
  9. If CAN voltages are abnormal, isolate/repair short/open by disconnecting harness sections or other nodes and re-testing until the offending section is found.
  10. If wiring, power and ground are good and the bus is healthy but the PAM does not respond, check for software updates or reflash options from dealer/service info.
  11. As a last step, replace the PAM only after confirming failure with wiring and network verified good. Reprogram/configure per manufacturer procedures.
  12. After repair, clear codes, perform a full system scan, and verify parking assist operation during a road test or guided self-test.

Likely causes

  • Loose/corroded connector or damaged wiring to PAM
  • Blown fuse or lost power/ground to the PAM
  • CAN bus wiring fault between PAM and gateway/BCM
  • Faulty PAM or gateway (module failure) after wiring/power ruled out

Fault status

⚠️ Status
U0159 — Lost Communication With Parking Assist Control Module (module not responding on vehicle network; parking assist functions unavailable).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

U0140 U0100 U0142 U0121 U0073
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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