P0606 code on a Subaru — Service bulletin 07-75-13R

Swapping a battery can cause a P0606 code on a Subaru

Subaru has issued a service bulletin #07-75-13R to address Subaru P0606 code. The bulletin describes how a battery disconnect or battery swap can cause a Subaru P0606 code to store. If you have recently disconnected the battery or installed a new battery without providing backup power and later notice a P0606 code, here’s the story.

Why you have a Subaru P0606 code

Here’s the definition of a P0606 code: CONTROL MODULE PROCESSOR. All Subaru Forester and WRX vehicles equipped with a turbo engine are equipped with backup memory. When you disconnect the battery, you wipe the backup memory. If you reconnect the battery with the IGN in the OFF position and then turn the IGN to ON within one minute after reconnecting the battery, the Subaru P0606 code will set. A Subaru P0606 can also set under these conditions:

OBD memory clear
A dead or severely discharged battery
ECM replacement where the battery is disconnected
Accessory installation or service procedure that requires a battery disconnect

Fix Subaru P0606 code

Using a code reader or scan tool, clear the code

Turn the IGN to ON and then to OFF. Wait for at least one full minute before turning the IGN to ON again. This procedure will allow the self-shutoff relay to power down and complete the self-shutoff procedure.

How to install a new battery without losing memory or setting a code

All vehicles lose their adaptive memory if you simply disconnect the battery cables without providing backup power to the ECM. In addition, you can also lose electronic throttle body home position programming, requiring you to perform a throttle body relearn when you reconnect the new battery.

There’s a way to avoid all these problems with a jumper pack and an OBDI II cable. To learn more, see this post on how to replace a car battery.

©, 2020 Rick Muscoplat