U0244 Code: Symptoms, Common Causes, Diagnosis & Repair Costs

U0244 Code — What It Means, Common Symptoms, and How to Resolve It

Drivers who see a running‑board light out or a flashing body‑control warning are often puzzled by a single diagnostic trouble code: U0244 – Lost Communication With Running Board Control Module A. The code indicates that the vehicle’s communication network cannot exchange data with the module that controls the exterior side‑step illumination and related body‑control functions. Because the module does not receive commands nor report its status, the lights it governs may stay dark, flash erratically, or behave inconsistently, and the instrument cluster typically displays a communication‑error indicator. Early identification prevents a cascade of body‑control warnings and restores the safety‑critical illumination that many drivers rely on when entering or exiting the vehicle.

Symptoms

• Running‑board (side‑step) lights remain off, dim, or flicker continuously.
• Side‑marker or puddle‑lamp LEDs fail to illuminate or flash intermittently.
• A “communication error” or “module A – communication” warning appears on the dash, often accompanied by a generic body‑control light.
• In some models, the vehicle’s central gateway may log a loss‑of‑communication event, causing the infotainment screen to display a network‑fault message.
• No impact on engine, transmission, or drivability; the vehicle otherwise runs normally.

These signs are the most common way the U0244 code manifests, because the Running Board Control Module A is dedicated to exterior illumination and body‑control signaling rather than powertrain functions.

Why This Happens

Damaged Wiring Harness or Connectors

Corrosion, chafing, or impact damage to the harness that runs from the body control gateway to the Running Board Module can interrupt the CAN‑bus signals. Even a single bent pin in the connector can prevent the module from acknowledging the network, triggering U0244.

Power‑Supply Interruption

The module receives a constant 12 V supply from the vehicle’s body‑control power distribution. A blown fuse, loose ground strap, or voltage drop caused by a failing battery cable can starve the module of power, resulting in loss of communication.

CAN‑Bus Faults

The vehicle’s high‑speed CAN bus carries messages between all control modules. A short to ground, excessive resistance, or a faulty termination resistor can corrupt the bus, isolating the Running Board Module from the rest of the network.

Internal Module Failure

Circuit‑board component degradation, moisture intrusion, or a failed microcontroller can render the module unable to process or transmit data. In such cases, the module may still receive voltage but will not respond to network queries.

Software Corruption

Occasionally, a failed flash update or a glitch in the module’s firmware can leave the communication stack in an undefined state. The module appears powered but does not participate in the bus, prompting the U0244 code.

Diagnostic and Repair Procedures

1. Retrieve the Code with a Professional Scan Tool

– Connect an OBD‑II scanner capable of reading network‑level codes. Confirm that U0244 is present and note any accompanying codes (e.g., U0100 for general CAN loss) that may indicate a broader bus issue.

1. Inspect Wiring and Connectors

– Locate the harness leading to the Running Board Control Module A (typically under the side‑step or behind the front fender). Check for frayed wires, corrosion, or loose pins. Clean contacts with electrical contact cleaner and reseat the connector.

1. Verify Power and Ground

– Measure voltage at the module’s power pin while the ignition is ON. A stable 12 V reading confirms supply. Measure resistance to chassis ground; it should be less than 0.5 Ω. Replace any blown fuses or repair a loose ground strap.

1. Test CAN‑Bus Continuity

– Using a CAN‑bus probe, verify that the high‑speed CAN lines (CAN‑H and CAN‑L) have proper continuity to the gateway. Check termination resistance (approximately 120 Ω across CAN‑H/L at each end of the bus). Replace a faulty termination resistor if needed.

1. Perform a Bi‑Directional Communication Test

– Many advanced scan tools can send a request to the Running Board Module and read the response. A “no response” result confirms loss of communication beyond wiring issues.

1. Re‑program the Module (If Software Issue Suspected)

– If the hardware appears sound, attempt a reflash of the module’s firmware using the manufacturer’s re‑programming procedure. This step often resolves corrupted software without hardware replacement.

1. Evaluate Repair vs. Replacement

– If the module fails the communication test after wiring, power, and CAN checks, internal failure is likely. Minor board‑level repairs (e.g., solder joint restoration) may be possible but are typically temporary. Replacement is usually the most reliable path.

Estimated Costs

• Diagnostic scan and wiring inspection: $80‑$120 labor.
• Re‑programming (software update): $150‑$250 labor, plus any required flash tools.
• Module repair (board‑level work): $200‑$400, but success rates vary.

When Replacement Makes More Sense Than Repair

If the Running Board Control Module A does not respond after exhaustive wiring, power, and CAN‑bus verification, the likelihood of internal component failure is high. Repair attempts on a compromised circuit board often provide only a short‑term fix; moisture ingress or heat‑related damage can re‑appear within months. For vehicles older than six years, the cost of a professional board repair can approach the price of a new, VIN‑matched module, while offering less reliability.

Flagship One positioning

Modern control modules are complex and integrated with security and immobilizer systems. That’s why choosing a replacement isn’t only about the hardware—it’s about correct programming and compatibility. Flagship One specializes in VIN‑matched control modules, providing a plug‑and‑drive solution backed by warranty. Replacement units vary depending on production date and software version, so the correct module is matched by VIN before programming. A VIN‑programmed replacement eliminates the guesswork of module pairing, ensures all body‑control functions communicate flawlessly, and arrives pre‑loaded with the vehicle‑specific calibration, reducing shop time to a single installation.

When the module’s internal circuitry is damaged, a Flagship One replacement typically costs $650‑$950 for the hardware plus $200‑$300 labor, a price that reflects the reliability of a fresh, factory‑spec unit and the convenience of pre‑programming.

Preventive Maintenance

• Protect Wiring Harnesses – Route the side‑step harness away from moving suspension components and sharp edges. Use zip ties with a gentle pull to avoid stress on connector pins.
• Keep Connectors Clean and Dry – Periodically spray electrical contact cleaner into the module’s connector and re‑seat it to prevent corrosion, especially in regions with heavy road salt.
• Inspect Grounds Regularly – A loose chassis ground can cause intermittent communication loss. Verify that ground straps near the module are tight and free of rust during routine under‑car inspections.
• Avoid After‑Market Modifications that Alter CAN Load – Adding non‑OEM lighting or accessories that draw power from the body‑control circuit can overload the bus and create voltage spikes. If modifications are necessary, route power through a dedicated fuse block and verify CAN‑bus integrity afterward.
• Schedule Diagnostic Scans at Major Service Intervals – A quick scan for network codes every 12 000 mi can catch early communication anomalies before they trigger a full U0244 fault.