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

Quick Answer

The U135A diagnostic trouble code (DTC) for Cadillac vehicles indicates that there is a communication failure with the Shift To Park Range Actuator. Common causes include Faulty Shift To Park Range Actuator, Loose or damaged wiring connections between the actuator and the vehicle's computer, Corrosion or water damage affecting the electrical components. 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 Shift To Park Range Actuator, Loose or damaged wiring connections between the actuator and the vehicle's computer, Corrosion or water damage affecting the electrical components.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code U135A Cadillac Description

The U135A diagnostic trouble code (DTC) for Cadillac vehicles indicates that there is a communication failure with the Shift To Park Range Actuator. This means that the vehicle's onboard computer is unable to establish proper communication with the actuator responsible for shifting the transmission into the park range. This can result in various issues related to the transmission system and may prevent the vehicle from being properly shifted into park, causing safety concerns. The Shift To Park Range Actuator is an essential component that ensures the vehicle is safely parked and can also affect the ignition system's operation.

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

Common Causes of U135A Cadillac

  1. Faulty Shift To Park Range Actuator
  2. Loose or damaged wiring connections between the actuator and the vehicle's computer
  3. Corrosion or water damage affecting the electrical components
  4. Software glitches or communication errors within the vehicle's control module
  5. Physical damage to the actuator due to external factors or wear and tear

Symptoms of U135A Cadillac

  1. Inability to shift the vehicle into the park gear
  2. Warning messages on the instrument panel related to the transmission
  3. Intermittent starting issues due to the vehicle not registering in park
  4. Malfunctioning reverse camera or parking assist features
  5. Difficulty turning off the ignition or removing the key from the ignition switch

How to Fix U135A Cadillac

  1. Begin by conducting a thorough inspection of the Shift To Park Range Actuator and its wiring connections for any visible damage or loose connections.
  2. Use a diagnostic scan tool to retrieve the DTC and clear any stored codes. Check for any additional related codes that may provide more insight into the issue.
  3. Test the actuator's functionality by manually shifting the transmission into park and verifying communication with the vehicle's computer.
  4. Replace the Shift To Park Range Actuator if it is deemed faulty or not responding to commands.
  5. Reset the vehicle's computer system and perform a test drive to ensure the issue has been resolved.

Cost to Fix U135A Cadillac

The cost of repairing the U135A DTC for a Cadillac vehicle can vary depending on factors such as the specific model and year of the vehicle, the extent of the issue, and the labor rates in your area. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. Keep in mind that additional diagnostic time may be required to pinpoint the exact cause of the communication failure, which could increase the overall cost. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's specific circumstances.

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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 it’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?

You’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.

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