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Expert
202 Answers
- Posted on Dec 17, 2010
Re: What is a code p0601 for a 2008 saturn vue
P0601 ENGINE CONTROL MODULE CHECKSUM ERROR
- The nerve center of the fuel injection system is the engine control module (ECM)
- The
ECM constantly supervises the information from various sensors, and
regulates the systems that start after vehicle performance.
- The ECM is also empowered to control all the diagnostic functions of the system.
- It can detect operational flaws and caution the driver through the Malfunction Indicator Lamp (MIL)
- It
also records and stores a Diagnostic Trouble Code (DTC) which detects
the likely problem- making parts to help the technician while repairing.
- In order to house the program information and the calibrations required for engine, trans-axle diagnostics operation an electrically erasable programmable read only memory (EEPROM) is used.
- For detecting errors in the software the ECM uses a specially devised value known as the checksum.
- The checksum (self explanatory) is a value that is the sum total of all the numbers in the software added together.
- If the values recorded by the ECM and the checksum do not match then a checksum error is highlighted.
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