Disconnect the battery, keep it disconnected for five to 20 minutes, reconnect the battery.
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No
If you're not the original owner, it's possible that the ECM was replaced at some point.
Code 128 on a Freightliner Columbia 2006 typically indicates an issue related to the vehicle's engine control module (ECM) or a fault in the communication between the ECM and other systems. This code can be triggered by various factors, including sensor malfunctions or wiring issues. It's essential to use a diagnostic tool to retrieve more specific information and determine the root cause of the problem for effective troubleshooting. Consulting a professional mechanic is recommended for accurate diagnosis and repair.
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The best way is to identify the cause of the faults, and fix them. If you need to reset the ECM, disconnect the positive from the battery, let it sit for at least five minutes, then reconnect the battery.
You can reset the ecm with a scan tool or by unhooking the battery.
Assuming you're referring to the speed governor, it's programmed into the motor's ECM.
Just unhook the battery cables for 5 mins, That will reset the ECM
To reset the ECM remove the battery cable (s) for a few minutes. Replace cable. ECM has been reset.