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This is a DC-DC converter (Honda also refers to it as a "voltage stabilization module") made by Toyota Industries Corporation, a subsidiary of Toyota Group - the company that owns Toyota Motor Corporation which makes Toyota automobiles.

The Ridgeline has used this DC-DC converter since the 2020 model year when it gained auto idle stop.

According to the service information, "the DC-DC converter boosts the voltage to compensate for voltage loss that occurs when restarting the engine in order to provide a stable power supply to each electrical component of the vehicle. The DC-DC converter is activated by a start signal from the PCM."

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Idle stop, VCM?
This is a question. Considering the starter, battery, electronic hardware, computer changes, maybe extra maintaince , how much does all this actually cost the owner? How much does it affect the EPA results? Then DI verses port injection?
When the J35 switched from port injection to direct injection and added VCM, the Ridgeline went from:

250 > 280 HP
247 > 262 lb-ft torque
17 > 21 MPG combined fuel economy

When auto idle stop was added to the Ridgeline, the combined fuel economy didn't change, but it lost 1 MPG on the highway and gained 1 MPG in the city. The 1 MPG city gain is likely the result of auto idle stop and a taller starting gear ratio. The 1 MPG highway loss must be due to the 9-speed transmission.

Appliances such as washing machines, dryers, refrigerators, freezers, dishwashers, etc are supposedly more efficient but much shorter lived - 2,3,4 times shorter lived.
There's no money in making things last as long as they used to. :)
 
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