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DTC P0651 - LNP or LNQ

The engine control module (ECM) has three 5 V reference circuits. The ECM provides the 5 V reference to various sensors. Each reference circuit provides a 5 V reference for greater than one sensor. A short to ground or voltage on one of the 5 V reference circuits will affect all components connected to that 5 V reference circuit. The ECM monitors the voltage on the 5 V reference circuits.

The ECM detects a voltage above 5.5 V, or below 4.5 V, on any of the 5 V reference circuits for greater than 0.5 s.

DTC P0651 00 is a Type B DTC.

If a shared 5 V reference circuit is shorted to ground or shorted to a voltage, other 5 V reference circuits may be affected.

P0651 00

The 5 V reference 2 circuit provides 5 V to the accelerator pedal position (APP) sensor 2, A/C pressure sensor, diesel particle filter differential pressure sensor, manifold absolute pressure sensor and the intake manifold runner position sensor.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. DTC P0651 00 should not set.
2. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

Note: Additional DTCs will set when disconnecting the components.

1. Ignition OFF, disconnect the harness connector at all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.
2. Ignition ON, test for 4.6-5.4 V between the 5 V reference circuit and ground.

⇒	If the voltage is less than the specified range, test the 5 V reference circuit for a short to ground. If all circuits test normal, replace the K20 Engine Control Module.

⇒	If greater than the specified range, test the 5 V reference circuit for each component associated with the 5 V reference circuit for a short to voltage. If all circuits test normal, replace the K20 Engine Control Module.

Note: A short to voltage on the signal circuit of certain components may cause this DTC to set.

3. Observe the scan tool that DTC P0651 00 is not set while connecting each component associated with the 5 V reference circuit one at a time.

⇒	If the DTC sets when a component is connected, test the signal circuit for a short to voltage. If all circuits test normal, replace the component.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.