What causes ECU no communication?
With error message showing “No-Communication”! In most cases, communication issues can be caused by various reasons including: ignition-key position, connector-voltage issues, incorrect communication protocol, hung ECM, missing or bad data, and OEM-updated ECM software that is unknown to the scan tool.
How do you reset the computer on a Chevy Express van?
Remove the nut off the negative battery cable with a socket set or wrench. Slide the cable off of the battery and put it aside. Turn the headlight switch to the “on” position to drain the ecm of any remaining power. Wait at least 10 minutes, then turn it back to the “off” position.
Why is my obd2 not working?
The most common cause of an OBD scanner that won’t turn on is a blown fuse on the vehicle’s OBD socket power supply circuit. If the check engine light fails to aluminate, you can be sure the fuse has blown. Checking the vehicle’s fuse box and replacing the blown fuse fixes the issue.
Where is the computer located on a 2011 Chevy Silverado?
The ECM for a 2011 Chevy Silverado can be found on the driver’s side of the engine compartment near the fender. It is a plastic box that is mounted on the fender and has a lot of wires that run into it. The ECM in Your truck controls all of the functions of the engine.
What does lost communication with engine control module?
What Does the U0100 Code Mean? DTC U0100 stands for “Lost Communication with ECM/PCM ‘A. ‘” It is triggered once there is a loss of communication between your PCM and a particular module. Once this happens, the vehicle may shut off and it may not restart unless you address the issue triggering the code.
Where is the ECM fuse located?
The power distribution center, or fuse block, located under the hood houses most or all of the vehicle’s fuses and relays. It contains a relay for the ECM that is powered up when the ignition key is turned to the on position.
What is DLC fuse?
The data link connector (DLC) is the multi-pin diagnostic connection port for automobiles, trucks, and motorcycles used to interface a scan tool with the control modules of a given vehicle and access on-board diagnostics and live data streams. J1708 is a DLC used on heavy duty vehicles.
Is there a fuse for the OBD?
Usually there is a fuse for the OBD port, if you cannot find they the fuse for the cigarette lighter and the auxiliary ports. The most common reason for getting no OBD code is simply a blown fuse. Check your fuses to see if any have gone bad. Remember that your car or truck might have more than one fuse box.
How do I fix U0100?
After all, we don’t want to do that unless it’s absolutely necessary.
- First, Check Your Battery. This may sound obvious, but check your voltage before you look at anything else.
- Check For ECM and TIPM/BCM Trouble Codes.
- Check the Wiring Harness.
- Check the CAN C Bus Connection.
- Check the PCM.
How to troubleshoot the PCM in a Chevy truck?
If your PCM fails your Chevy truck can experience a wide range of problems. The only way to diagnose a faulty PCM is to use a special tool, called an on-board diagnostic scan tool, or “OBD” scan tool. These tools are available from most auto parts stores. Step 1
What does lost communication with ECM / PCM mean?
Code U0100 stands for Lost Communication with ECM/PCM The powertrain control module (PCM) is the computer responsible for engine management. Like the other computers (known as modules) onboard your vehicle, the PCM communicates over a bus.
What causes the ECM in a car to fail?
The most common source of ECM failure is in one of the wiring harnesses. If the wires to the transmission or fuel injectors become corroded, they can lose conductivity, leading to a failure. Fortunately, these issues can usually be resolved by replacing the corroded wires. If one of the wires shorts out to the frame, the ECM may fail entirely.
What are the symptoms of a bad ECM computer?
There are a few things that can tip you off that there’s a problem. Here are the four most common symptoms of a bad ECM computer: There are many reasons your Check Engine light can turn on. These range from emissions problems to faulty O2 sensors to problems with the ECM.