2015-2017 Hyundai Veloster MDPS Steering Module: Diagnosing Failure, Noise, and Programming

Is it a Body Control Module or a Steering Control Module?

First, let's clear up a common point of confusion. While you may have searched for a 'Body Control Module' (BCM), the part responsible for power steering in the 2015-2017 Hyundai Veloster is the MDPS Control Module. MDPS stands for Motor Driven Power Steering. This is a dedicated computer that only controls the steering system and is mounted directly to the steering column inside the cabin.

Known Issues, TSBs, and Recalls

The MDPS system in this generation of Hyundai vehicles has some well-documented issues. Understanding them can help you correctly diagnose your problem.

The Famous MDPS Coupler "Clicking" Noise (TSB 17-ST-001)

The most common issue with this system is not the electronic module itself, but a small, star-shaped rubber part inside the steering column called the flexible coupler. Over time, this coupler disintegrates, causing a distinct clicking or clunking sound when you turn the steering wheel. While this does not cause a loss of steering, the noise is a major annoyance. This issue is covered by Hyundai Technical Service Bulletin (TSB) 17-ST-001. 🎬 Watch: Detailed walkthrough on repairing the steering wheel knocking noise. The part is inexpensive, but replacement requires significant labor to access the steering column motor.

MDPS Module Internal Failure

The electronic control module itself can fail internally. This is a more serious problem that results in a loss of power steering assist. This failure often triggers specific diagnostic trouble codes, most notably C1604 (ECU Hardware Error), which points directly to a fault within the module.

Recalls

While there were some recalls for electronic power steering on other Hyundai models like the Elantra, there are no specific NHTSA recalls for the MDPS control module or motor on the 2015-2017 Veloster. There is an unrelated safety recall (NHTSA #20V-746, Hyundai #198) for some 2015-2016 Veloster models concerning engine connecting rod bearing wear, which could lead to engine failure or fire.

Symptoms of a Failing MDPS Control Module

When the MDPS control module fails, the symptoms are typically immediate and obvious. They are very different from the simple clicking of a bad coupler.

• Sudden Heavy Steering: The primary symptom is a complete loss of power steering assist. The steering wheel will become very difficult to turn, especially at parking lot speeds. The car reverts to manual steering.
• Intermittent Steering Assist: The power steering may work sometimes and fail at other times, often without warning.
• EPS Warning Light: The "EPS" (Electronic Power Steering) warning light will illuminate on your instrument cluster.
🎬 See how to fix and reset the EPS warning light.
• Steering Wheel Vibration: In some cases, a failing module can cause the steering wheel to vibrate or jerk erratically.

Common Diagnostic Trouble Codes (DTCs)

A professional scan tool can pull codes from the MDPS system. The most common codes indicating a module or related sensor failure include:

• C1604 - ECU Hardware Error: This code strongly indicates an internal, non-repairable failure of the control module itself.
• C2412 - Motor Circuit Malfunction: While this code mentions the motor, it can be caused by a faulty module that is failing to properly control the motor circuit.
• C1290 - Torque Sensor Main/Sub Signal Fault: This points to a failure of the sensor that tells the module how much the driver is turning the wheel.

Programming and Calibration: A Critical Step

Simply swapping the part is not enough. The new module needs to be configured for your vehicle’s specific options. This process is called "Variant Coding" in Hyundai's terminology. If this step is skipped, the system will not work, and a C1702 (Variant Coding Error) fault code will be stored.

Additionally, after the module is installed and coded, the system requires an "ASP (Absolute Steering Position) Calibration." This procedure teaches the module where the straight-ahead position of the steering wheel is.

This is not a task for a basic OBD-II code reader. It requires a dealer-level tool like the Hyundai GDS or a professional-grade J-2534 passthru tool with a valid Hyundai software subscription. This means a trip to the dealership or a well-equipped independent repair shop is necessary.

Buying a Used MDPS Control Module

Purchasing a used MDPS control module is an excellent way to save a significant amount of money. However, because this is a critical safety and electronic component, you must be careful to get the right part and install it correctly.

• Match the Part Number Exactly: The most important rule is to match the OEM part number on your original module to the used one you are buying. The primary part number for 2015-2017 Velosters is 56340-2V500. Do not rely on visual appearance alone.
• Inspect for Damage: When you receive the part, inspect the housing for any cracks or signs of heavy impact. Check the electrical connectors for any corrosion, moisture, or bent pins. Do not install a part that shows signs of water damage.
• Factor in Programming Costs: Remember that the money you save on the part will be partially offset by the need for professional programming. Call local dealerships or specialty import shops beforehand to get a quote for programming a customer-supplied MDPS module.
• Why Used OEM is a Good Choice: For complex electronics like this, a used original equipment (OEM) part is often more reliable than a new, cheap aftermarket alternative. The OEM module was designed and tested specifically for your vehicle's systems, ensuring proper communication and function once programmed.

Cost Breakdown for Replacement

Costs can vary based on your location and choice of parts. Here is a general estimate:

Frequently Asked Questions (FAQ)