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Engine-Codes – GMC – U1170 GMC

U1170 GMC Code - Lost Communications With Driver Door Switch Assembly

Quick Answer

The U1170 GMC code indicates that there is a communication error between the vehicle's onboard computer system and the driver door switch assembly. Common causes include Damaged wiring or connectors in the door harness, Faulty driver door switch assembly, Malfunctioning body control module (BCM). 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
U1170 GMC indicates Lost Communications With Driver Door Switch Assembly.
Common causes
Common causes include Damaged wiring or connectors in the door harness, Faulty driver door switch assembly, Malfunctioning body control module (BCM).
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 Sep 17, 2024
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Code U1170 GMC Description

The U1170 GMC code indicates that there is a communication error between the vehicle's onboard computer system and the driver door switch assembly. The driver door switch assembly is responsible for controlling various functions related to the door, such as the power windows, door locks, and mirror adjustments. When communication is lost with this assembly, it can lead to a variety of issues that affect the vehicle's performance and functionality.

OBDII Code U1170 GMC - Lost Communications With Driver Door Switch Assembly
U1170 GMC Code - Lost Communications With Driver Door Switch Assembly

Common Causes of U1170 GMC

  1. Damaged wiring or connectors in the door harness
  2. Faulty driver door switch assembly
  3. Malfunctioning body control module (BCM)
  4. Software glitch in the vehicle's computer system
  5. Corrosion or moisture in the electrical connections

Symptoms of U1170 GMC

  1. Inoperative power windows or door locks
  2. Unresponsive mirror adjustments
  3. Intermittent operation of the affected systems
  4. Illumination of the door ajar warning light
  5. Error code U1170 stored in the vehicle's computer system

How to Fix U1170 GMC

  1. Begin by conducting a thorough visual inspection of the wiring and connectors in the door harness to check for any damage or corrosion.
  2. Test the driver door switch assembly using a multimeter to determine if it is functioning properly or needs replacement.
  3. Use a diagnostic scan tool to communicate with the vehicle's computer system and retrieve any stored fault codes, including the U1170 code.
  4. Inspect the body control module (BCM) for any signs of damage or malfunction, and perform any necessary repairs or replacements.
  5. Clear the U1170 code from the vehicle's computer system after completing the repairs and conduct a final test to ensure that the communication error has been resolved.

Cost to Fix U1170 GMC

The typical repair costs for addressing a U1170 GMC code can vary depending on the specific cause of the communication error and the extent of the repairs needed. In general, the cost of parts such as a new driver door switch assembly or body control module can range from $100 to $500 or more, while labor costs for diagnosis and repair can add an additional $100 to $300 or more. Overall, the total repair cost for this issue may range from $200 to $800 or higher, depending on the complexity of the repair process and the rates charged by the auto repair shop. It's advisable to consult with a professional mechanic or dealership to obtain a more accurate estimate based on your vehicle's make and model, as well as the specific circumstances of the communication error.

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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 U1170 GMC Code

1. What does the OBDII code U1170 mean on a GMC vehicle?

The U1170 code indicates a loss of communication with the Driver Door Switch Assembly (DDSA), meaning the module is not receiving or sending signals properly on the communication network.

2. What are the common symptoms of the U1170 code in a GMC?

Symptoms may include inoperative power windows, mirrors, or door locks, no interior lighting response from the driver door, and potentially a malfunctioning driver door switch.

3. What causes the U1170 code to appear?

Common causes include a faulty Driver Door Switch Assembly, damaged or corroded wiring, loose electrical connectors, or issues with the communication bus.

4. Can a dead battery cause the U1170 code to trigger?

Yes, a weak or dead battery can disrupt communication between modules and potentially trigger the U1170 code.

5. How do you diagnose the U1170 code?

Diagnosis typically involves scanning for associated codes, inspecting the wiring and connectors to the DDSA, and using a scan tool to check the communication status on the vehicle's network.

6. Can the U1170 code be caused by a software issue?

Yes, outdated or corrupted software in the vehicle's control modules may lead to communication errors like the U1170 code.

7. How do you fix the U1170 code on a GMC?

Repairs may include replacing the Driver Door Switch Assembly, repairing damaged wiring or connectors, updating module software, or resetting the communication network.

8. Is it safe to drive with the U1170 code active?

While it may be safe to drive, the affected features like power windows or locks may not work, and the issue should be addressed to avoid further communication problems.

9. How much does it cost to repair the U1170 code on a GMC?

Repair costs can vary depending on the exact issue but typically range from $100 to $500, depending on whether the DDSA or wiring needs replacement.

10. Can clearing the code fix the U1170 issue permanently?

Clearing the code may temporarily remove it, but the underlying problem must be fixed to prevent the code from returning.

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