GM ACDELCO ECMs can be recovered with shadow passwords using OBDSTAR DC706 & I/O Terminal in boot mode.
User Review: Successful GM E78 ECM Recovery with DC706
A user successfully restored a GM E78 ECM from a Silverado using the DC706 ECU Tool, emphasizing the importance of ShadowFlash reading in the process.
Why ShadowFlash Reading is Crucial?
When working with DC706, the tool provides an option to read ShadowFlash, which is essential for ECU recovery.
Case Summary:
A failed bench writing attempt left an E78 ECU inoperative—it stopped communicating via OBD and triggered DTC P0606 (Processor Fault).
The DC706 ECU Tool supports boot mode writing, but a password is required for the process.
This password can only be retrieved by reading ShadowFlash before performing boot mode operations.
Thanks to the ShadowFlash reading function, the ECM was successfully recovered, preventing permanent damage.
Key Note:
ShadowFlash reading is not found in the boot menu.
To access it, navigate to:
Delco E78 > Bench Mode Menu > ShadowFlash Option
Boot Mode Recovery Process – Step-by-Step Images
GM E78 ECM successfully restored using OBDSTAR DC706!
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