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U0159 Lost Communication With Parking Assist Control Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0159 reports that parking assist control module A, which evaluates the ultrasonic sensors and drives the distance warnings, has fallen silent. GM spells out the check for the brake module: the 2019 Cadillac XT4 EBCM (19OBDG03D) and the 2020 brake module tables (20OBDG03C) set it when the automatic-parking braking request is missing for more than 0.25 s, Type C, no MIL. GM bulletins PIT5507E (2014-2018 full-size trucks and SUVs) and 20-NA-099 (CT6) cure start-up U0159 entries with new park assist software. Ford SSM 51486 (2023 Super Duty) and VW TSB 01-24-02 (2024 ID.4) treat it as a harmless ABS entry; Stellantis S2108000149 asks for module updates. Park assist then switches off.

Likely causes

Park assist module software fault, fixed by reprogramming (GM PIT5507E, 20-NA-099)
Modules on different software levels (Stellantis S2108000149)
Park assist module without power or ground
Harmless entry after remote start or wake-up (Ford, VW)
Bus line or connector in the bumper/rear area damaged

Symptoms

  • Park assist unavailable or Service Parking Assist message
  • Park assist switch cannot turn the system on or off
  • Code stored in brake module, cluster or BCM

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–800
Time0.3–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

parking assist modulecan bus wiring

Related codes

U045AU031DU031EU0129U0121

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.