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Message: <blockquote data-quote="AuroraGirl" data-source="post: 28680" data-attributes="member: 9417"><p>heres the answer:</p><p></p><table style='width: 100%'><tr><td><strong>[H2]DTC C0241-C0254 or C041-C054 Over 8600 GVW or Rear Drum Brakes[/H2]</strong><br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/50/4/4184/1601#ss1-1401849" target="_blank">[H3]Circuit Description[/H3]</a><br /> <br /> <em>As the front wheels spin, each wheel speed sensor (WSS) produces an AC signal. The electronic brake control module (EBCM) uses the frequency of the AC signals to calculate each wheel speed. The powertrain control module (PCM) converts the signal from the vehicle speed sensor (VSS) to a 128k pulses/mile signal. The EBCM uses the vehicle speed signal from the PCM to calculate the rear wheel speed.</em><br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/50/4/4184/1601#ss2-1401849" target="_blank">[H3]DTC Descriptor[/H3]</a><br /> <br /> This diagnostic procedure supports the following DTC:<br /> <br /> DTC C0245 Wheel Speed Sensor Frequency Error<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/50/4/4184/1601#ss3-1401849" target="_blank">[H3]Conditions for Running the DTC[/H3]</a><br /> <br /> <p style="text-align: left"><table style='width: 100%'><tr><td>    • </td><td>The ignition is ON.</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>The vehicle speed is greater than 8 km/h (4 mph).</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>No brake application or deceleration is detected.</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>No wheel slip is detected.</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>No turning maneuvers are detected.</td></tr></table></p> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/50/4/4184/1601#ss4-1401849" target="_blank">[H3]Conditions for Setting the DTC[/H3]</a><br /> <br /> <p style="text-align: left"><table style='width: 100%'><tr><td>    • </td><td>At least one WSS signal is 15 percent less than or greater than other WSS signals.</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>All of the Conditions for Running and Setting the DTC are present for a cumulative time of 3 minutes during a single ignition cycle.</td></tr></table></p> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/50/4/4184/1601#ss5-1401849" target="_blank">[H3]Action Taken When the DTC Sets[/H3]</a><br /> <br /> <p style="text-align: left"><table style='width: 100%'><tr><td>    • </td><td>The EBCM disables the ABS and dynamic rear proportion (DRP).</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>The ABS indicator turns ON.</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>The brake warning indicator turns ON.</td></tr></table></p> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/50/4/4184/1601#ss6-1401849" target="_blank">[H3]Conditions for Clearing the DTC[/H3]</a><br /> <br /> The Conditions for Setting the DTC are no longer present and you use the scan tool Clear DTCs function.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/50/4/4184/1601#ss7-1401849" target="_blank">[H3]Diagnostic Aids[/H3]</a><br /> <br /> <strong>Installing one tire of significantly different size on the vehicle causes this DTC to set. Operating the vehicle with a tire that has very low air pressure may also set this DTC. Inspect the vehicle for an incorrect or damaged WSS or VSS if the tires and the EBCM and PCM calibrations are OK.</strong><br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/50/4/4184/1601#ss8-1401849" target="_blank">[H3]Test Description[/H3]</a><br /> <br /> The number below refers to the step number on the diagnostic table.<br /> <br /> <ol> <li data-xf-list-type="ol"><ul> <li data-xf-list-type="ul"><strong><strong>If the front tires are not the same size as the rear tires, the EBCM calibration must match the FRONT tire size and the PCM calibration must match the REAR tire size.</strong></strong></li> </ul></li> </ol> [ATTACH=full]5975[/ATTACH]</td></tr></table></blockquote><p></p>