AutoCodes – Cadillac – U135A Cadillac

U135A Cadillac Code - Lost Communication With Shift To Park Range Actuator

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 Control Module Setting the Diagnostic Trouble Code (DTC), Control Module harness is open or shorted, 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: U135A Cadillac indicates Lost Communication With Shift To Park Range Actuator.
Common causes: Common causes include Faulty Control Module Setting the Diagnostic Trouble Code (DTC), Control Module harness is open or shorted, 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 1,645

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 May 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U135A 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) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U135A Cadillac - Lost Communication With Shift To Park Range Actuator - AutoCodes.com — U135A Cadillac Code - Lost Communication With Shift To Park Range Actuator

What does this mean?

What are the Possible Causes of the DTC U135A Cadillac?

Faulty Control Module Setting the Diagnostic Trouble Code (DTC)
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U135A 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 U135A 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 U135A Cadillac Code

1. What does OBDII code U135A mean on a Cadillac?

Code U135A indicates a lost communication issue between the vehicle's control module and the Shift to Park Range Actuator.

2. What are the common symptoms of code U135A on a Cadillac?

Common symptoms include the vehicle not recognizing that itâ€™s in Park, the "Shift to Park" message displaying on the dashboard, and issues with turning off the vehicle.

3. What causes code U135A to appear on a Cadillac?

This code is typically caused by a faulty Shift to Park Range Actuator, damaged wiring or connectors, or a malfunction in the control module.

4. Can I drive my Cadillac with code U135A?

While the vehicle might still be drivable, unresolved issues with the Shift to Park system can prevent the car from turning off properly, which may drain the battery.

5. How do you diagnose code U135A on a Cadillac?

Diagnosis involves scanning the vehicle's computer for related codes, inspecting the Shift to Park Actuator for damage, and checking the wiring and connections for continuity or corrosion.

6. How is code U135A fixed on a Cadillac?

Fixes may include replacing the Shift to Park Range Actuator, repairing or replacing damaged wiring or connectors, or reprogramming the control module if necessary.

7. What tools are needed to repair code U135A on a Cadillac?

Youâ€™ll need an OBDII scanner, a multimeter for checking wiring continuity, and potentially tools to access and replace the actuator or control module.

8. How much does it cost to fix code U135A on a Cadillac?

Repair costs vary but typically range from $200 to $600, depending on whether the actuator, wiring, or control module needs replacement.

9. Can a software update resolve code U135A on a Cadillac?

In some cases, a software update or reprogramming of the control module may resolve the issue if it stems from a communication error.

10. Is code U135A common on Cadillac vehicles?

This code is relatively common in newer Cadillac models with electronic gear shift systems, as these systems rely heavily on communication between components.