U1016 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 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.
Code U1016 Description
What are the Possible Causes of the DTC U1016?
- 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?
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.
Code Tech Notes
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 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 code?
Need more information on how to fix the U1016 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U1016 code diagnosed by a professional: Find a repair shop in your area
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
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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