View Full Version : Attention P1640: internal control Module MemoryCheck Sum error

11-07-2010, 08:53 AM
Dear All,
I own a 2004 Touareg V10 TDI and begining y'day started showing the heater plug symbol blinking. the error above was returned from a quick diagnostic.

What should I do to fix this? The car is still moving well

27-07-2010, 02:08 PM
Unfortunately mate an internal checksum error normally means a faulty ECU. Did you try to erase the fault?