Honda Ecu 3.5.5.2

For a technician, the arrival of 3.5.5.2 meant more reliable "Key Programming" and "ECU/PCM replacement" procedures. When a new or used ECU is installed in a Honda (like a 2005 Acura MDX or a 2013 Honda Fit), the immobilizer system must be synchronized, or the "green key" light will blink, and the engine will not start. Tools running this software allow the technician to: Register the VIN

Just a heads-up for the community – Honda has rolled out ECU revision . It appears to be a non-recall update targeting: honda ecu 3.5.5.2

If you are building a high-performance Honda (turbo D-series or all-motor B18), the 3.5.5.2 firmware is too restrictive. Its MAP sensor resolution is limited to 1 bar (atmospheric). It cannot read boost. It also has a hard-coded rev limiter at 7,200 RPM. For a technician, the arrival of 3

While MCU Innovations offers various versions, 3.5.5.2 is often sought after in the "tuner" and "autotronic" communities. It is frequently hosted on developer repositories like It appears to be a non-recall update targeting: