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Diagnostic Trouble Code: 021
Diagnostic Trouble Code Name: Rear Defrost Request Switch Circuit
Vehicle Make: Chevrolet
Vehicle Model: Tosca (V250)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Please Note: The DTC Information provided has been randomly generated.
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Diagnostic Trouble Code Description:
Immobilizer Fuel Enable Signal Not Correct
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P1631
Circuit / System Description
The body control module (BCM) sends the security code to the engine control module (ECM) via serial data. The ECM then sends a challenge to the BCM. Both the ECM and BCM perform a calculation on this challenge. If the calculated response from the BCM equals the calculation performed by the ECM, the ECM will allow vehicle starting.
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