U0549 Code - Invalid Data Received From Remote Accessory Module
Quick Answer
The U0549 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has detected invalid data being received from a remote accessory module. Common causes include Faulty remote accessory module, Wiring or connection issues between the remote accessory module and the main ECM, Corrosion or damage to the CAN bus network. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U0549 indicates Invalid Data Received From Remote Accessory Module.
- Common causes
- Common causes include Faulty remote accessory module, Wiring or connection issues between the remote accessory module and the main ECM, Corrosion or damage to the CAN bus network.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code U0549 Description
The U0549 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has detected invalid data being received from a remote accessory module. In modern vehicles, there are multiple control modules that communicate with each other through a network known as the Controller Area Network (CAN). These modules include the engine control module (ECM), transmission control module (TCM), anti-lock brake system (ABS) module, airbag module, and various other modules responsible for functions such as climate control, power windows, and entertainment systems.
Common Causes of U0549
- Faulty remote accessory module.
- Wiring or connection issues between the remote accessory module and the main ECM.
- Corrosion or damage to the CAN bus network.
- Software glitches or programming errors in the modules.
- Electrical interference from aftermarket electronic accessories.
Symptoms of U0549
- Dashboard warning lights illuminating unexpectedly.
- Erratic behavior of electronic accessories such as power windows or door locks.
- Remote keyless entry system malfunctioning.
- Remote start system not working properly.
- Loss of communication with certain modules leading to system malfunctions.
How to Fix U0549
- Begin by performing a thorough inspection of the wiring and connections between the remote accessory module and the main ECM. Look for any signs of damage, corrosion, or loose connections.
- Use a diagnostic scan tool to communicate with the remote accessory module and check for any stored trouble codes that could provide additional information.
- If no visible issues are found, consider reprogramming or updating the software in the modules to address any potential glitches.
- Test the remote accessory module to verify its functionality and replace it if necessary.
- Clear the DTC and perform a test drive to ensure that the issue has been resolved.
Cost to Fix U0549
The cost of repairing a U0549 DTC can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the cost of replacing a faulty remote accessory module and addressing wiring/connectivity issues can range from $200 to $500, including parts and labor. It is important to factor in additional diagnostic time and potential software updates that may be required, which could increase the overall cost. As mentioned earlier, labor rates at auto repair shops typically range from $80 to $150 per hour, so it's advisable to check with local shops for a more accurate estimate.
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