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Engine-Codes – Generic – U1016

U1016 Code - Lost Communications With Powertrain/Engine Control Module

Quick Answer

The U1016 diagnostic trouble code (DTC) indicates that there is a communication issue between the Powertrain/Engine Control Module (PCM/ECM) and other modules in the vehicle. Common causes include Faulty PCM/ECM, Loose or corroded wiring connections, Faulty communication bus. 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 indicates Lost Communications With Powertrain/Engine Control Module.
Common causes
Common causes include Faulty PCM/ECM, Loose or corroded wiring connections, Faulty communication bus.
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 06, 2024
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Code U1016 Description

The U1016 diagnostic trouble code (DTC) indicates that there is a communication issue between the Powertrain/Engine Control Module (PCM/ECM) and other modules in the vehicle. This can lead to a lack of data exchange between the PCM/ECM and other control modules, resulting in various performance issues. The PCM/ECM plays a crucial role in controlling the engine and transmission functions, so a lost communication with it can affect the vehicle's overall operation.

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

Common Causes of U1016

  1. Faulty PCM/ECM
  2. Loose or corroded wiring connections
  3. Faulty communication bus
  4. Software issues
  5. Water damage or corrosion in connectors

Symptoms of U1016

  1. Check Engine Light illuminated
  2. Poor fuel efficiency
  3. Rough idling or stalling
  4. Transmission shifting issues
  5. Loss of power or acceleration

How to Fix U1016

  1. Check and repair any loose or corroded wiring connections between the PCM/ECM and other modules.
  2. Inspect and potentially replace the PCM/ECM if it is found to be faulty.
  3. Scan and diagnose the communication bus for any faults and address them accordingly.
  4. Update or reprogram the software in the PCM/ECM to ensure proper communication with other modules.
  5. Check for water damage or corrosion in connectors and repair or replace them as needed.

Cost to Fix U1016

The cost of repairing a U1016 code can vary depending on the specific cause of the issue. On average, the repair cost for this type of communication problem can range from $100 to $500, including parts and labor. However, it is important to note that the actual cost may vary based on the location, vehicle make and model, and the extent of the repair needed. Additionally, diagnostic time and labor rates at auto repair shops can also impact the final cost. It is recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's specific needs.

What does this mean?

Tech Notes for U1016

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.

Need more information about the U1016 code?

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Code U1016 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
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 Code

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

- Common symptoms of code U1016 include engine stalling, rough idling, poor acceleration, and difficulty starting the vehicle.

2. What can cause the U1016 code to be triggered?

- The U1016 code is typically triggered when there is a communication failure between the powertrain/engine control module and other control modules in the vehicle.

3. How can I diagnose the U1016 code?

- Diagnosing the U1016 code involves using a diagnostic scanner to retrieve the trouble codes, checking for loose or damaged wiring, and testing the communication between control modules.

4. What are some possible repair tips for resolving the U1016 code?

- Repair tips for resolving code U1016 include checking and repairing any damaged wiring, resetting the powertrain control module, and ensuring all control modules are properly communicating.

5. Can a faulty battery or alternator cause the U1016 code to appear?

- Yes, a faulty battery or alternator can potentially cause the U1016 code to appear due to power supply issues affecting communication between control modules.

6. Will driving with the U1016 code present cause further damage to my vehicle?

- Driving with the U1016 code present may not cause immediate damage, but it is recommended to address the issue promptly to prevent potential long-term damage to the vehicle's control systems.

7. Is it safe to continue driving my vehicle with the U1016 code?

- It is generally safe to drive the vehicle with the U1016 code, but it is advisable to have the issue diagnosed and repaired as soon as possible to avoid potential performance issues.

8. Can a DIY enthusiast repair the U1016 code, or is professional help required?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, resolving the U1016 code may require professional diagnostic equipment and expertise to accurately diagnose and repair the issue.

9. Are there any recalls related to the U1016 code for specific vehicle models?

- Recalls related to the U1016 code vary by vehicle manufacturer and model, so it is advisable to check with the manufacturer or a dealership to see if there are any relevant recalls for your specific vehicle.

10. How much can I expect to pay for repairing the U1016 code at a mechanic or dealership?

- The cost of repairing the U1016 code can vary depending on the underlying cause and the labor rates of the mechanic or dealership. It is recommended to obtain multiple quotes for an accurate estimate.

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