AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Generic - U1016

U1016 Code - Lost Communications With Powertrain/Engine Control Module

- Code Popularity: 39,252 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC U1016?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Powertrain/Engine Control Module (PCM/ECM)
  • Powertrain/Engine Control Module harness is open or shorted
  • Powertrain/Engine Control Module circuit poor electrical connection
⚠ Does your Car have Safety Recalls? → Check here

How to Fix the DTC U1016?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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.

Search for U1016 Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1016 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine cranks but may not start – may be intermittent
  • May or may not be able to communicate with a scan tool / depends on problem

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

Need More Information on the Code?

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

Information for Specific Makes

  • U1016 Buick Lost Communications With Powertrain/Engine Control Module
  • U1016 Cadillac Lost Communications With Powertrain/Engine Control Module
  • U1016 Chevrolet Lost Communications With Powertrain/Engine Control Module
  • U1016 GMC Lost Communications With Powertrain/Engine Control Module
  • U1016 Pontiac Lost Communications With Powertrain/Engine Control Module
  • U1016 Saab Invalid Or Missing Data For Powertrain/Engine Control Module
  • U1016 Saturn Lost Communications With Powertrain/Engine Control Module

Need Help with the Code?

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

Code U1016 comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U1016 code? Have you replaced any parts?
Any information is appreciated. Thanks