2021 Hyundai Tucson / Veloster VCM Faults & DTCs

Owners of certain 2021 Hyundai Tucson and Veloster vehicles may experience issues with the Variable Charge Motion Controller (VCM). This can lead to a Check Engine Light, performance problems, and unusual noises. Hyundai TSB 21-EM-008H outlines detailed diagnostic and repair guidelines for these Hyundai Tucson VCM faults.

Symptoms

If your vehicle is affected by Hyundai Tucson VCM faults, you might notice one or more of the following symptoms:

• "Check Engine Light illumination with VCM related DTC."
• "Unstable engine RPM and reduced engine power."
• "Abnormal noise from the intake manifold whenever engine RPM is raised from idle speed."

These symptoms indicate a potential malfunction of the Variable Charge Motion Controller system, which is crucial for managing intake manifold airflow and optimizing engine combustion.

Fault Codes / DTCs

The following Diagnostic Trouble Codes (DTCs) are associated with VCM issues and are covered by TSB 21-EM-008H:

DTC	Description	Control	MIL	Notes
P2016	Sensor signal SCG SCP/OC	RPM and Torque are limited	1 Drive Cycle	HOLD locked in VCM closed position
P2017	Sensor signal SCG SCP/OC	RPM and Torque are limited	1 Drive Cycle	HOLD locked in VCM closed position
P2018	Noise Detected from sensor signal	Normal Engine control	2 Drive Cycles	Fault detected, normal VCM control
P2004	Sensor signal: Open Fixed	Control Flap in closed position	1 Drive Cycle
P2006	Sensor signal: Closed Fixed Abnormal Range	Control Flap in closed position, RPM and Torque limited	1 Drive Cycle	HOLD locked in VCM closed position
P200A	Initial learning failure, Driven learning failure, Endurance error, Max Duty Time Over, Contamination error	Normal Engine Control, Control Flap in closed position	2 Drive Cycles, 2 Drive Cycles, 1 Drive Cycle	Fault detected, normal VCM control, HOLD fixed in VCM closed position, 3 counters. HOLD Fixed in VCM closed position
P2008	Driver IC error (ECU or VCM)	Control Flap in closed position, RPM and Torque limited	1 Drive Cycle	HOLD Fixed in VCM closed position
P2009	Driver IC error (ECU or VCM)	Control Flap in closed position, RPM and Torque limited	1 Drive Cycle	HOLD Fixed in VCM closed position
P2010	Driver IC error (ECU or VCM)	Control Flap in closed position, RPM and Torque limited	1 Drive Cycle	HOLD Fixed in VCM closed position

Diagnosis / Trigger Conditions

Diagnosis for these VCM-related issues typically involves checking the DTC code using a GDS (Global Diagnostic System) tool. Technicians will perform a visual inspection for bent VCM pin connectors or obstructions and damage to the port flap and linkage assembly. An actuation test of the VCM is also performed to check for proper operation and to identify any grinding noise or inoperable conditions.

Important Warnings

Hyundai explicitly states a critical instruction for technicians and owners:

• "Do not replace the entire Intake Manifold Assembly." Instead, if the VCM Motor, Rod, or Lever Arm Assembly is damaged, only the specific VCM components should be replaced, especially for 2.4L engines where a dedicated VCM Service Kit is available.

Repair Procedure Summary

The repair process outlined in TSB 21-EM-008H involves several steps to diagnose and address VCM issues:

1. Preparation: The engine is turned off, and the negative battery terminal is disconnected. Owners should note that radio presets must be recorded before battery disconnection.
2. Access: Technicians remove sections of the air cleaner and the purge pipe hose to gain access to the VCM.
3. Component Removal: The PCSV fixing bolt is removed to create clearance. The VCM connector is disconnected, and the VCM connecting bolts are removed using a 10mm socket wrench. The tightening torque for these bolts is 95 lb-in (10.8 Nm).
4. VCM Replacement: The VCM Motor is removed and replaced as needed. For 2.4L engines, if the Rod or Lever Arm Assembly is damaged, it should be replaced using the VCM Service Kit (part number 28399-2GGA0). The K-Ring and VCM rod clip are also addressed during this step.
5. Reassembly: All removed parts are reinstalled in reverse order of disassembly.
6. Finalization: Radio presets, which were recorded earlier, are reprogrammed.

Required Tools or Parts

For the repair of Hyundai Tucson VCM faults, specific parts may be required:

• VCM Motor:
  • 2.4L engines: Part number 28323-2GGA1
  • 2.0T engines (Santa Fe Sport, Sonata, Santa Fe): Part number 28323-2GTA1
  • 2.0T Veloster N (JSN): Part number 28323-2GPD0
• VCM Service Kit (for 2.4L engines only): Part number 28399-2GGA0. This kit includes the Rod, Lever Arm, Clip, and K-Ring.
• K-Ring (available separately): Part number 28231-2GGA0.

Owner Action

If your 2021 Hyundai Tucson or Veloster exhibits symptoms like a Check Engine Light, unstable RPM, or abnormal intake manifold noise, it is recommended to visit an authorized Hyundai dealership. Inform them about the symptoms and the potential relevance of Technical Service Bulletin 21-EM-008H. The dealership technicians will perform the necessary diagnostics and repairs, which may be covered under warranty.

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Source: NHTSA ID: 10199107