Rough Idle After Engine Repairs

After making engine repairs that included removing and installing the engine wiring harness on the right side of the 3.6L V6 engine (RPO LGZ) on some 2017-2019 Colorado and Canyon models, a rough idle condition may be present along with DTC P0016 (Crankshaft Position – Intake Camshaft Position Not Plausible Bank 1) set in the Engine Control Module (ECM).

The wiring connector for the Intake Camshaft Actuator Solenoid Bank 1 on top of the engine and the connector for the Intake Actuator Park Lock Solenoid in the front of the engine for bank 1 (Fig. 12, #1) may have been swapped. These two connectors are identical and can only be identified by the wire color in the connector.

Fig. 12

If these conditions are found, remove the connector and review the schematic in the appropriate Service Information to compare the wire colors. Verify that the correct connector is plugged into the actuator solenoid and lock solenoid.

The Bank 1 Intake Actuator Solenoid connector (Fig. 13, #1) and Bank 1 Park Lock Solenoid connector (Fig. 13, #2) are shown in the photo, with the same hose identified to show location. (Fig. 13, #3)

Fig. 13

If the connectors are incorrect, swap them back and clear the DTC to verify the repair. If the connectors are in the correct location, refer to the appropriate Service Information to continue diagnosis of DTC P0016.

– Thanks to Bryan Salisbury

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Re-centering the Transmission Range Control Module

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