AutoCodes – Chevrolet – U1016 Chevrolet

U1016 Chevrolet 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 Chevrolet 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 32,388

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

What does this mean?

What are the Possible Causes of the DTC U1016 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 U1016 Chevrolet code?

Need more information on how to fix the U1016 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1016 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Code

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

- Common symptoms include engine stalling, rough idling, poor fuel efficiency, and difficulty starting the vehicle.

2. What can cause the U1016 code in a Chevrolet, indicating lost communication with the Powertrain/Engine Control Module?

- The U1016 code can be triggered by issues such as a faulty PCM/ECM, damaged wiring harness, loose connections, or a blown fuse.

3. How can I diagnose the U1016 code in my Chevrolet?

- Diagnosing the U1016 code involves checking the wiring connections, inspecting the PCM/ECM for any visible damage, and using a diagnostic scanner to retrieve more specific error codes.

4. What are some repair tips for fixing the U1016 code in a Chevrolet?

- Repair tips include ensuring all wiring connections are secure, replacing damaged wiring harnesses, resetting the PCM/ECM, and clearing the error code using a diagnostic scanner.

5. Can the U1016 code cause serious damage to my Chevrolet vehicle?

- While the U1016 code itself may not cause immediate damage, ignoring the underlying communication issues can lead to further problems with the vehicle's performance and drivability.

6. Is it safe to continue driving my Chevrolet with the U1016 code present?

- It is not recommended to drive the vehicle with the U1016 code active, as it can affect the engine's performance and potentially lead to more serious issues if left unresolved.

7. How much does it typically cost to repair the U1016 code in a Chevrolet?

- The cost of repairing the U1016 code can vary depending on the underlying cause, but it may range from $100 to $500 for parts and labor.

8. Can I reset the U1016 code in my Chevrolet without fixing the underlying issue?

- While you can clear the error code temporarily, it is essential to address the root cause of the U1016 code to prevent it from reoccurring.

9. Are there any preventive measures to avoid the U1016 code in a Chevrolet?

- Regular maintenance, such as checking the wiring connections and monitoring the vehicle's performance, can help prevent issues that may trigger the U1016 code.

10. How long does it take to repair the U1016 code in a Chevrolet?

- The repair time for the U1016 code can vary depending on the complexity of the issue, but it typically takes a few hours to a full day for diagnosis and repair.