AutoCodes – GMC – U135A GMC

U135A GMC 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 GMC 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 521

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

What does this mean?

What are the Possible Causes of the DTC U135A GMC?

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 GMC?

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 GMC 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 U135A GMC code?

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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 GMC Code

What does OBDII code U135A mean on a GMC?

U135A indicates a lost communication issue with the Shift to Park Range Actuator, meaning the vehicle's control module cannot communicate with the component responsible for detecting the "Park" position.

What are the common symptoms of a U135A code?

Symptoms include the "Shift to Park" message on the dashboard, inability to turn off the vehicle completely, and potential battery drain if the vehicle doesn't recognize it's in Park.

What causes the U135A code to appear?

Common causes include faulty wiring or connectors, a defective Shift to Park Range Actuator, a failing Body Control Module (BCM), or software glitches in the vehicle's electronic systems.

How do I fix the U135A code on a GMC vehicle?

Repairs may involve inspecting and repairing damaged wiring or connectors, replacing the Shift to Park Range Actuator, updating the vehicle's software, or resetting the BCM.

Can a U135A code cause long-term damage if not addressed?

If left unresolved, the code can lead to battery drain due to the vehicle not shutting down properly, which could eventually damage the battery or other electrical components.

How is the U135A code diagnosed?

A technician will use an OBDII scanner to confirm the code, inspect wiring and connectors, test the Shift to Park Range Actuator, and check for updates or faults in the BCM.

Can I drive my GMC with a U135A code?

While the vehicle may still drive, ignoring the issue could lead to inconvenience when parking, potential battery drain, and possible safety concerns if the vehicle doesn't properly recognize Park.

What tools are needed to troubleshoot the U135A code?

Tools include an OBDII scanner, a multimeter for testing electrical circuits, and potentially software update tools for reprogramming the BCM.

Is the U135A code covered under warranty for GMC vehicles?

This depends on the warranty terms and the age of the vehicle. Check with your dealership to see if this issue is covered under the powertrain or bumper-to-bumper warranty.

How much does it cost to fix the U135A code?

Repair costs vary but typically range from $100 to $500, depending on whether the issue is a simple wiring repair or requires replacing the Shift to Park Range Actuator or BCM.