AutoCodes – Cadillac – U156D Cadillac

U156D Cadillac Code - Chassis Control Module Lost Communication With Transmission Shift Lever On LIN Bus

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Transmission Shift Lever, Transmission Shift Lever harness is open or shorted, Transmission Shift Lever 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: U156D Cadillac indicates Chassis Control Module Lost Communication With Transmission Shift Lever On LIN Bus.
Common causes: Common causes include Faulty Transmission Shift Lever, Transmission Shift Lever harness is open or shorted, Transmission Shift Lever 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 936

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 Jun 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U156D Cadillac Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Chassis Control Module from the Transmission Shift Lever has not been received.

OBDII Code U156D Cadillac - Chassis Control Module Lost Communication With Transmission Shift Lever On LIN Bus - AutoCodes.com — U156D Cadillac Code - Chassis Control Module Lost Communication With Transmission Shift Lever On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U156D Cadillac?

Faulty Transmission Shift Lever
Transmission Shift Lever harness is open or shorted
Transmission Shift Lever circuit poor electrical connection
Faulty Chassis Control Module

How to Fix the DTC U156D 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 U156D 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.

Need more information about the U156D Cadillac code?

Need more information on how to fix the U156D Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U156D Cadillac code diagnosed by a professional: Find a repair shop in your area

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 U156D Cadillac Code

1. What are common symptoms of OBDII code U156D in a Cadillac?

- Common symptoms include issues with shifting gears, transmission not engaging properly, and warning lights illuminated on the dashboard.

2. What does the OBDII code U156D indicate in a Cadillac?

- The code U156D indicates that there is a communication problem between the Chassis Control Module and the Transmission Shift Lever on the LIN bus.

3. What are possible causes of the Chassis Control Module losing communication with the Transmission Shift Lever in a Cadillac?

- Possible causes include damaged wiring or connectors, a faulty Chassis Control Module, a malfunctioning Transmission Shift Lever, or a communication bus error.

4. How can I diagnose the issue related to code U156D in my Cadillac?

- Diagnosing the issue may involve checking the wiring and connectors for damage, testing the Chassis Control Module and Transmission Shift Lever, and using a diagnostic scanner to read the codes and communicate with the modules.

5. What are some repair tips for resolving code U156D in a Cadillac?

- Repair tips may include repairing or replacing damaged wiring and connectors, replacing the Chassis Control Module or Transmission Shift Lever if faulty, and ensuring proper communication on the LIN bus.

6. Can code U156D be cleared and reset in a Cadillac?

- Yes, the code U156D can be cleared and reset using a diagnostic scanner after the underlying issue has been diagnosed and repaired.

7. Is it safe to drive my Cadillac with OBDII code U156D present?

- It is not recommended to drive your Cadillac with code U156D present, as it can lead to transmission issues and potentially unsafe driving conditions.

8. How much does it typically cost to repair OBDII code U156D in a Cadillac?

- The cost of repairing code U156D can vary depending on the specific cause of the issue, but it may involve labor costs for diagnosis and repair, as well as the cost of any replacement parts.

9. Can I fix OBDII code U156D in my Cadillac myself, or should I take it to a professional mechanic?

- Depending on your experience and expertise, you may be able to diagnose and repair the issue yourself. However, it is recommended to consult a professional mechanic for complex electrical and transmission-related issues.

10. How often does OBDII code U156D occur in Cadillac vehicles?

- OBDII code U156D related to Chassis Control Module communication issues with the Transmission Shift Lever on the LIN bus is a relatively rare occurrence in Cadillac vehicles, but it can still happen due to various factors.