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Home >> Buick >> 2015 >> Verano Leather >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 2.0L (LHU) - DTC P025A To DTC P2635 Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0641, P0651, P0697, or P06A3: 5V Reference Circuit (ECM) >> Circuit/System Description

Circuit/System Description

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The engine control module (ECM) has 4 internal 5V reference circuits. Each internal reference circuit provides external 5V reference circuits for more than one sensor. A short to ground or short to voltage on one external 5V reference circuit can affect all the components connected to the same internal 5V reference circuit.

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