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Home >> Cadillac >> 2013 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls/Fuel - Hybrid (LZ1) - DTC P0351 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0641 or P0651 (ECM) >> Circuit/System Description

Circuit/System Description

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The engine control module (ECM) has 2 internal 5-volt reference circuits. Each internal reference circuit provides external 5-volt reference circuits to more than one sensor. A short to ground or short to voltage on one external 5-volt reference circuit can affect all the components connected to the same internal 5 V reference circuit.

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