DTC B1009: Checksum Error In Control Module: Description

Internal fault detection is handled inside control module. No external circuits are involved. DTC B1009 is set when control module detects a check-sum error in internal memory. When DTC B1009 is set, microprocessor refuses all additional inputs. Current DTC B1009 will clear and become a history DTC when microprocessor makes a successful check-sum maneuver with Electronically Erasable Programmable Read Only Memory (EEPROM). History DTC B1009 will clear after 100 consecutive ignition cycles if problem for malfunction is no longer present.