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Pontiac
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2009
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G3 Automatic
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Diagnostic Information and Procedures
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DTC C0121
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Circuit/System Testing
Circuit/System Testing
Ignition OFF, disconnect the EBCM connector.
Measure for 0 ohms between the EBCM ground circuits and ground.
If more than 0 ohms, repair open or high resistance in ground circuit.
If all circuits test normal replace the EBCM.