AutoCodes – Pontiac – U1016 Pontiac

U1016 Pontiac 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 Pontiac 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 2,779

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 24, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1016 Pontiac 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 Pontiac - Lost Communications With Powertrain/Engine Control Module - AutoCodes.com — U1016 Pontiac Code - Lost Communications With Powertrain/Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U1016 Pontiac?

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 Pontiac?

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 Pontiac 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 Pontiac Code

1. What does the OBDII code U1016 on a Pontiac indicate?

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

2. What are the common symptoms of the U1016 code in a Pontiac?

Common symptoms of the U1016 code include issues with engine performance, stalling, rough idling, and problems with the transmission.

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

Possible causes of the U1016 code include faulty wiring or connectors, a malfunctioning Powertrain/Engine Control Module, a weak battery, or a software issue.

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

Diagnosing the U1016 code usually involves using an OBDII scanner to read the code and checking for any additional codes present. It may also require inspecting the wiring and connectors for any visible damage.

5. How can I repair the U1016 code in my Pontiac?

Repairing the U1016 code may involve fixing any wiring or connector issues, replacing a faulty Powertrain/Engine Control Module, ensuring the battery is in good condition, or updating software as needed.

6. Can I drive my Pontiac with the U1016 code?

It is not recommended to drive your Pontiac with the U1016 code present, as it can lead to further damage and potentially unsafe driving conditions. It's best to address the issue promptly.

7. How much does it typically cost to repair the U1016 code on a Pontiac?

The cost of repairing the U1016 code can vary depending on the specific cause of the issue. It is advisable to consult with a mechanic or dealership for an accurate diagnosis and cost estimate.

8. Will disconnecting the battery reset the U1016 code on my Pontiac?

Disconnecting the battery may reset the code temporarily, but if the underlying issue is not addressed, the code is likely to return. It's important to diagnose and repair the root cause of the problem.

9. Can a DIY enthusiast fix the U1016 code on a Pontiac?

While some aspects of diagnosing and repairing the U1016 code may be possible for experienced DIY enthusiasts, it is recommended to seek professional help for a thorough diagnosis and proper repair to ensure the issue is resolved correctly.

10. How soon should I address the U1016 code in my Pontiac?

It is advisable to address the U1016 code as soon as possible to prevent further damage to the vehicle and ensure safe and optimal performance. Ignoring the code can lead to more severe issues down the line.