To reset your ECU with a scanner, plug an OBD2 scanner into the port under your dashboard, turn the ignition to the "ON" position (engine off), and select "Clear Codes," "Erase DTCs," or "Reset ECU" from the menu. The scanner will confirm the process, clearing stored data and the check engine light.
Yes, you can reset the ECU using an OBD2 scanner, but it's important to note that not all scanners are equipped to handle this task.
Connecting to the ECU
Loss of Data: Resetting the ECU clears any stored data, such as fuel trims and performance settings. If the car has adaptive learning, it may take some time for the ECU to relearn optimal settings after a reset.
After a reset, the car must complete a full driving cycle for all readiness monitors to perform self-checks. Typically, driving the car under normal conditions is recommended for about a week before the inspection.
Reprogramming your ECU/ECM yourself is doable – follow this checklist to be sure you're getting the job done right: Contact your dealer to see if a replacement ECU will need programming. Get in touch with Tom's Foreign Auto Parts with your old ECU part number. Order a quality used OEM ECU – with our 6-month guarantee.
Disconnected Wires – The wires connecting the OBD II port to the vehicle's computer may be disconnected or damaged, preventing communication. Dead Battery – If your car battery is dead or low, the OBD II scanner may not be able to establish a connection.
For the ECU to fully recalibrate and restore optimal performance, it can take anywhere from 50 to 100 miles (80-160 km) of driving. This involves a variety of driving conditions, including city driving, highway cruising, and potentially some hard acceleration or deceleration to help the ECU adjust performance settings.
Leave the battery disconnected for a few minutes. Then reconnect, positive first then negative, and then immediately drive the car for 10 minutes or more. If you are just disconnecting the battery, taking all wires off the negative terminal is sufficient.
You plug an OBD-II scanner tool into it and, in most cases, out pops a code that tells you what the problem is. The scanner also allows you to clear the vehicle's internal code, which is what triggered the check-engine light. Do that, and the warning light will turn off.
Fortunately, and ECU can be reprogrammed or updated, a simple procedure which can take care of troublesome, irritating issues with your car. In the right hands, it's as simple as plugging the car up and letting the technician run through the procedure of reprogramming an ECU.
To make sure the check engine light does not reappear, it's recommended that you drive your car 30 to 100 miles. This enables the vehicle's “Drive Cycle” to reset, as the various sensors need time to recalibrate.
Conclusion. Yes, you can reset the ECU with an OBD2 scanner—and the VDIAGTOOL VD70S is the perfect tool for the job. With its advanced features, user-friendly design, and global compatibility, the VDIAGTOOL VD70S empowers you to take control of your vehicle's performance and maintenance.
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.
Issues like low battery voltage, damaged or shorted CAN lines, blown ignition power feeds, bent connector pins, or even a faulty ECU can all cause the ECM to disappear from the network.
Typical Costs of ECM Replacement
Programming on ECUs depends on the make and model, but generally around $200-$600. Labour also really depends, but can be anything from $200 to $1,000. Always try and use a reliable service for ECM repairs.
The ECU programming process typically involves three main steps:
It will clear any error codes but won't reset the ecu as in like fuel trims or whatnot. Immediate Effects Clears Trouble Codes: All non-permanent diagnostic trouble codes and stored event data that caused a "check engine" or other warning light to appear are erased from the system's memory.
A car battery can drain when the car is off due to parasitic draws (interior lights, radio, faulty relays, aftermarket accessories like dash cams), a failing alternator preventing recharge, loose/corroded connections, or simply an old battery reaching the end of its life, with normal drains from the clock and alarm systems becoming problematic when combined with other issues.
Look for the check engine light to ensure that there are no immediate issues. If it's off, take a short test drive to confirm that your vehicle is running smoothly and that the ECU reset was successful.
The drive cycle should clear the error codes and reset your vehicle's computer. Checking with an OBD-II scanner will confirm whether the codes are gone or not.