DTC Code U1226 – What does this code mean?
<p>The DTC code U1226 indicates that there is invalid or missing data for a body status request in vehicles with a class 2 serial data circuit. This occurs when a module fails to receive a critical operating parameter within 5 seconds of starting serial data communication, necessitating the use of a default value.</p>
Symptoms for DTC Code U1226
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<li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The illumination of the engine light indicates that the vehicle's onboard diagnostics system has detected an issue. This can be linked to <causes> such as a communication error between control modules, a faulty Body Control Module (BCM), or wiring issues.</li>
</ul>
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Common Causes for DTC Code U1226
<ul><li>The module responsible for communication may be faulty, leading to a lack of data transmission.</li><li>An open or shorted harness in the module can disrupt the flow of data, causing the error.</li><li>Poor electrical connections in the module circuit can result in intermittent or failed communication.</li></ul>
Troubleshooting for DTC Code U1226
<ul>
<li><b>Initial Scan</b>: Perform a comprehensive scan of the vehicle's control modules to confirm the presence of DTC U1226 and check for any other related codes.</li>
<li><b>Inspect Wiring and Connectors</b>: Visually inspect the wiring and connectors related to the Body Control Module (BCM) for any signs of damage, corrosion, or loose connections.</li>
<li><b>Check BCM Power and Ground</b>: Verify that the Body Control Module is receiving proper power and ground. Use a multimeter to check the voltage and ground connections.</li>
<li><b>Test Communication Lines</b>: Use an oscilloscope to test the communication lines (CAN bus) between the BCM and other modules to ensure there is no interruption or noise in the signal.</li>
<li><b>Module Reprogramming</b>: If no issues are found with wiring or communication lines, consider reprogramming or updating the BCM software to the latest version.</li>
<li><b>Replace BCM</b>: If the problem persists after reprogramming, replace the Body Control Module and re-test to ensure the issue is resolved.</li></ul>
Severity Description for DTC Code U1226
<p>The DTC code U1226 indicates 'Invalid Or Missing Data For Body Status Request'. This is a communication error within the vehicle's network, affecting the body control module (BCM).</p><ul><li><b>Immediate Actions:</b> Inspect wiring and connectors for damage or corrosion.</li><li><b>Potential Risks:</b> Delayed repair can lead to malfunctioning of body-related systems like lighting, windows, and locks.</li></ul>
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