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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 10-26-2009, 08:45 PM   #1
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Default P0243


SC boost solenoid control circuit error

Output driver modules (ODMs) are used by the powertrain control module (PCM) to turn on many of the current-driven devices that are needed to control various engine and transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. Unlike the quad driver modules (QDMs) used in prior model years, ODM’* have the capability of diagnosing each output circuit individually. DTC P0243 set indicates an improper voltage level has been detected the supercharger boost control solenoid control circuit.

You likely won't notice any drivability problems. The PCM will not illuminate the malfunction indicator lamp.


  • An improper voltage level has been detected on the boost control solenoid control circuit.
  • The above conditions are present for at least 30 seconds.
  • Poor connections at the PCM or the BCS – inspect harness connectors for:
    • Backed out terminals.
    • Improper mating
    • Broken locks
    • Improperly formed or damaged terminals
    • Poor terminal to wore connection
  • Damaged harness – inspect the wiring harness for damage.
If the harness appears OK, disconnect the PCM, turn the ignition ON and observer a voltmeter connected between the BCS control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the BCS. A change in voltage indicates the location of the malfunction.
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