AutoCodes – Buick – U1016 Buick

U1016 Buick Code - Lost Communications With Powertrain/Engine Control Module

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Powertrain/Engine Control Module (PCM/ECM), Powertrain/Engine Control Module harness is open or shorted, Powertrain/Engine 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: U1016 Buick indicates Lost Communications With Powertrain/Engine Control Module.
Common causes: Common causes include Faulty Powertrain/Engine Control Module (PCM/ECM), Powertrain/Engine Control Module harness is open or shorted, Powertrain/Engine 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 7,249

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 Apr 22, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1016 Buick Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1016 is set.

OBDII Code U1016 Buick - Lost Communications With Powertrain/Engine Control Module - AutoCodes.com — U1016 Buick Code - Lost Communications With Powertrain/Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U1016 Buick?

Faulty Powertrain/Engine Control Module (PCM/ECM)
Powertrain/Engine Control Module harness is open or shorted
Powertrain/Engine Control Module circuit poor electrical connection

How to Fix the DTC U1016 Buick?

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 does this mean?

Code Tech Notes

This is typically an electrical wiring connection issue at one of the controllers being monitored by the manufacturer.
It can occur if:
Someone changes a battery while the ignition switch is left on, that is, left in the RUN position.
Someone flashes/upgrades their engine controller - other modules unable to communicate with the PCM during this process - this will set U1016 at a multitude of controllers on the vehicle - all false codes. Erase and carry on.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1016 Buick 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 U1016 Buick Code

1. What are the common symptoms of OBDII code U1016 in a Buick?

- Common symptoms include engine stalling, rough idling, poor performance, and issues with shifting gears.

2. What does the OBDII code U1016 Buick indicate?

- The code U1016 indicates a communication problem between the Powertrain/Engine Control Module and other control modules in the vehicle.

3. What are the possible causes of the U1016 code in a Buick?

- Possible causes include faulty wiring or connections, a defective Powertrain/Engine Control Module, a blown fuse, or a malfunctioning communication network.

4. How can I diagnose the U1016 code in my Buick?

- Diagnosing the U1016 code typically involves checking the wiring and connections, inspecting the Powertrain/Engine Control Module, testing the communication network, and using a scan tool to retrieve additional fault codes.

5. Can I continue driving my Buick with the U1016 code present?

- It is not recommended to drive your Buick with the U1016 code present, as it can lead to further damage and potentially unsafe driving conditions.

6. How can I repair the U1016 code in my Buick?

- Repairing the U1016 code may involve repairing or replacing damaged wiring, ensuring proper connections, replacing the Powertrain/Engine Control Module if necessary, and addressing any underlying communication issues.

7. Will resetting the trouble codes make the U1016 code disappear?

- Resetting the trouble codes may temporarily clear the U1016 code, but it is important to address the underlying issue causing the code to prevent it from reappearing.

8. Can a DIY enthusiast fix the U1016 code in a Buick?

- Depending on their experience and tools available, a DIY enthusiast may be able to diagnose and repair the U1016 code in a Buick, but complex electrical issues may require professional assistance.

9. How much does it typically cost to repair the U1016 code in a Buick?

- The cost of repairing the U1016 code can vary depending on the underlying issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Is the U1016 code specific to Buick vehicles only?

- The U1016 code is a generic OBDII code related to lost communication with the Powertrain/Engine Control Module and can appear in various vehicle makes and models, not just Buick.