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U0545 — Invalid Data Received From Running Board Control Module

Generic OBD-II · all makesNetwork / communication

Code U0545 indicates that a receiving module (often the PCM, BCM, or instrument cluster) has detected invalid data from the Running Board Control Module over the vehicle's communication network. This typically means the running board module is transmitting corrupted, implausible, or intermittent signals, rather than a complete loss of communication.

Symptoms

What causes it — most likely first

1. Faulty running board control module

Internal failure of the module can cause it to send corrupted or invalid data on the CAN bus. This is the most common root cause.

2. Wiring or connector issues at the running board control module

Damaged, corroded, or loose connectors, or chafed wiring in the harness leading to the module can disrupt data transmission. Check for moisture intrusion or pin damage.

3. Poor power or ground supply to the running board control module

Insufficient voltage or a high-resistance ground can cause the module to malfunction and send erroneous data. Verify battery voltage and ground integrity at the module connector.

4. CAN bus communication fault

A problem with the CAN bus wiring (shorts, opens, or excessive resistance) between the running board module and other modules can corrupt data. This may also trigger other U-codes.

5. Software incompatibility or outdated calibration

If the running board control module or a receiving module has been replaced or updated with incorrect software, data interpretation may be invalid. A reflash or configuration reset may be needed.

6. Faulty receiving module (e.g., PCM, BCM)

Rarely, the module that set the code may have an internal fault causing it to misinterpret valid data. This should only be considered after all other causes are ruled out.

How it's diagnosed

  1. Use a scan tool to retrieve all stored codes and freeze frame data. Note any other U-codes that may indicate a broader network issue.
  2. Inspect the running board control module connectors and wiring harness for signs of corrosion, damage, or loose terminals. Pay close attention to the area where the harness may flex or be exposed to road debris.
  3. Check power and ground at the running board control module connector using a digital multimeter. Verify battery voltage on the power pin(s) and less than 0.1V drop on the ground circuit with the module connected and operating.
  4. Test the CAN bus communication lines for proper resistance (typically 60 ohms across the network with modules disconnected) and check for shorts to power, ground, or each other. Use a lab scope if available to observe signal quality.
  5. If wiring and power/ground are good, use a scan tool to command the running boards to deploy and retract while monitoring data. If the module does not respond or sends implausible data, suspect a faulty running board control module.
  6. Check for available software updates for the running board control module and any related modules. Perform a module reset or reconfiguration if applicable. Replace the running board control module only if all other tests pass and the module is confirmed defective.

Code facts & related codes

SystemNetwork / communication
StandardizationSAE generic — identical on every make
Related codesU0541 — Invalid Data Received From Entrapment U0542 — Invalid Data Received From Headlamp CoU0543 — Invalid Data Received From Headlamp CoU0544 — Invalid Data Received From Parking AssU0546 — Invalid Data Received From EntertainmeU0547 — Invalid Data Received From Seat Contro

Frequently asked

Can I drive my vehicle with a U0545 code?

Yes, this code does not affect engine or transmission operation, so the vehicle is generally safe to drive. However, the power running boards may not function correctly, which could be a safety concern when entering or exiting the vehicle.

Will a U0545 code clear itself?

The code may become a history code if the fault is intermittent and does not recur for a set number of drive cycles, but the underlying problem will not fix itself. If the issue is persistent, the code will return.

Is the engine computer (PCM) the likely cause of U0545?

No. The PCM is almost never the cause of this code. U0545 indicates a problem with the running board control module or its communication circuit. Replacing the PCM without proper diagnosis is a misdiagnosis and will not resolve the issue.

Do I need to replace the running board control module?

Not necessarily. First, check the wiring, connectors, power, and ground. Many U0545 codes are caused by simple electrical issues. Only replace the module if it is confirmed faulty through testing.