AutoCodes – Cadillac – U0159 Cadillac

U0159 Cadillac Code - Lost Communication With Parking Assist Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Parking Assist Control Module, Parking Assist Control Module harness is open or shorted, Parking Assist Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U0159 Cadillac indicates Lost Communication With Parking Assist Control Module.
Common causes: Common causes include Faulty Parking Assist Control Module, Parking Assist Control Module harness is open or shorted, Parking Assist Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,550

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0159 Cadillac Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Parking Assist Control Module has not been received.

OBDII Code U0159 Cadillac - Lost Communication With Parking Assist Control Module - AutoCodes.com — U0159 Cadillac Code - Lost Communication With Parking Assist Control Module

What does this mean?

What are the Possible Causes of the DTC U0159 Cadillac?

Faulty Parking Assist Control Module
Parking Assist Control Module harness is open or shorted
Parking Assist Control Module circuit poor electrical connection

How to Fix the DTC U0159 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0159 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0159 Cadillac Code

What does the OBDII code U0159 mean for a Cadillac?

U0159 indicates a lost communication with the parking assist control module, meaning the vehicle's computer is unable to communicate with this specific module.

What are common symptoms of the U0159 code?

Common symptoms include a malfunctioning parking assist system, warning lights on the dashboard, and potentially issues with other related systems like rear cameras or sensors.

What can cause the U0159 code to be triggered?

Causes can include a faulty parking assist control module, damaged wiring or connectors, software issues, or problems with the vehicle's main computer.

How can I diagnose the U0159 code?

Start by checking the wiring and connectors for damage or corrosion, then use a diagnostic scanner to see if other codes are present. Testing the parking assist module with a multimeter can also help determine if it's functioning.

What are some common repairs for the U0159 code?

Repairs may involve replacing the parking assist control module, repairing or replacing damaged wiring, or reprogramming the module if software issues are present.

Is it safe to drive my Cadillac with the U0159 code?

While you can drive the vehicle, the parking assist features may not work correctly, which can affect safety during parking. It's advisable to address the issue promptly.

How can I reset the U0159 code after repairs?

You can reset the code by using an OBD-II scanner to clear the trouble codes, or by disconnecting the vehicle's battery for a short period. However, ensure that the underlying issue is fixed first.

Can I fix the U0159 code myself?

If you have experience with automotive repair, you might be able to diagnose and fix the issue yourself, especially if it involves checking wiring or replacing simple components. However, complex issues may require professional assistance.

Will the U0159 code affect other vehicle functions?

Yes, the U0159 code can impact other functions related to parking assistance, such as rear sensors and cameras, potentially affecting overall vehicle safety features.