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Message: <blockquote data-quote="AuroraGirl" data-source="post: 28679" data-attributes="member: 9417"><p>do you have a gmt400 ? Isnt a 99 2500 a gmt400 still? </p><p>That would be logical for the EBC310 yes. but the EBC325, similar but not the only factor </p><p></p><p></p><p>Similar but not same:</p><p></p><p></p><table style='width: 100%'><tr><td><p style="text-align: left"><table style='width: 100%'><tr><td><strong>Subject:</strong></td><td><strong>ABS Light On DTC C0055 C0235 C0236 or C0237 Stored In The EBCM</strong></td></tr></table><br /> <br /> <table style='width: 100%'><tr><td><strong>Models:</strong></td><td><strong>1998-2008 All Chevrolet, GMC, Buick and Oldsmobile Mid-Sized Trucks and Utilities</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>1998-2008 All Chevrolet, GMC and Cadillac Full Sized Trucks, Utilities, and Vans</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>1998-2005 Chevrolet Astro</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>1998-2005 GMC Safari</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2003-2008 Hummer H2</strong></td></tr></table></p> <br /> <br /> <br /> <hr class="bbc-hr bbc-hr--3" /> <strong>This PI was superseded to update model years. Please discard PIT3521D.</strong><br /> <br /> <hr class="bbc-hr bbc-hr--3" /> The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/bulletins/1993197#ss1-1993197" target="_blank">[H3]Condition/Concern:[/H3]</a><br /> <br /> ABS light on speedometer may be erratic. DTC C0055 C0235 C0236 or C0237 stored in the EBCM. This concern may be intermittent and not easily reproduced.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/bulletins/1993197#ss2-1993197" target="_blank">[H3]Recommendation/Instructions:[/H3]</a><br /> <br /> Using the Tech 2, check the EBCM, ECM/ PCM and/or TCM for any speed sensor related DTCs. These DTCs will need to be diagnosed first. Follow published diagnostics for related DTCs, repair and evaluate the vehicle after repairs are complete. If no DTCs exist in any other module, inspect the rear VSS sensor circuit(s) from the rear VSS sensor to the related module (ECM, PCM or TCM) for integrity. These circuits are 821 and 822 or 400 and 401 depending on model and model year (use SI to locate the schematic that applies to your application). Repair or restring these two circuits as needed. Evaluate the vehicle.<br /> </td></tr></table><p></p><table style='width: 100%'><tr><td><p style="text-align: left"><table style='width: 100%'><tr><td><strong>Subject:</strong></td><td><strong>ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground)</strong></td></tr></table><br /> <br /> <table style='width: 100%'><tr><td><strong>Models:</strong></td><td><strong>2004-2007 Buick Rainier</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2002-2006 Cadillac Escalade, Escalade EXT</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2003-2006 Cadillac Escalade ESV</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>1999-2007 Chevrolet Silverado Classic</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2000-2006 Chevrolet Suburban, Tahoe</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2002-2006 Chevrolet Avalanche</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2002-2007 Chevrolet TrailBlazer, TrailBlazer EXT</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2003-2006 Chevolet SSR</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>1999-2007 GMC Sierra Classic</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2000-2006 GMC Yukon, Yukon Denali, Yukon XL</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2002-2007 GMC Envoy, Envoy XL, Sierra Denali Classic</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2004-2005 GMC Envoy XUV</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2002-2004 Oldsmobile Bravada</strong></td></tr></table></p> <br /> <br /> <br /> <hr class="bbc-hr bbc-hr--3" /> <strong>This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 04-05-25-002C (Section 05 -- Brakes).</strong><br /> <br /> <hr class="bbc-hr bbc-hr--3" /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/bulletins/1988903#ss1-1988903" target="_blank">[H3]Condition[/H3]</a><br /> <br /> Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/bulletins/1988903#ss2-1988903" target="_blank">[H3]Cause[/H3]</a><br /> <br /> A poor connection at the EBCM ground is causing unnecessary replacements of brake modules.<br /> <br /> <strong>Important: </strong>The EBCM Ground is different for each application. Refer to the list below for the proper ground reference:<br /> <br /> <p style="text-align: left"><table style='width: 100%'><tr><td>   • </td><td>Midsize Utilities = Ground 304</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>SSR = Ground 400</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>Fullsize Trucks and Utilities = Ground 110</td></tr></table></p> <br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/bulletins/1988903#ss3-1988903" target="_blank">[H3]Correction[/H3]</a><br /> <br /> <em>DO NOT REPLACE THE BRAKE MODULE.</em><br /> <br /> Perform the following steps to improve the connection of the EBCM Ground:<br /> <br /> <ol> <li data-xf-list-type="ol">Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire.</li> <li data-xf-list-type="ol">Clean the area, front and back, using a Whiz Wheel®.</li> <li data-xf-list-type="ol">Install the ground, then the washer and then the bolt to the frame.</li> <li data-xf-list-type="ol"><strong>Important: </strong> It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish.</li> <li data-xf-list-type="ol">Install a washer and nut to the back side of the frame.</li> <li data-xf-list-type="ol"><strong>Tighten</strong><br /> Tighten the nut to 9 N·m (79 lb in).</li> <li data-xf-list-type="ol">Cover the front and back side of the repair area using Rubberized Undercoating.</li> </ol> An additional check can be made to ensure a good connection for the Battery Cable to Frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/bulletins/1988903#ss4-1988903" target="_blank">[H3]Parts Information[/H3]</a><br /> <br /> <table style='width: 100%'><tr><th><p style="text-align: center"><em>FULL-SIZE TRUCKS, SUVs AND H2</em></p> </th><th></th></tr><tr><th><p style="text-align: center">Part Number</p> </th><th><p style="text-align: center">Description</p> </th></tr><tr><td><p style="text-align: center">11588564</p> </td><td><p style="text-align: center">Bolt</p> </td></tr><tr><td><p style="text-align: center">15650962</p> </td><td><p style="text-align: center">Washer</p> </td></tr><tr><td><p style="text-align: center">15672934</p> </td><td><p style="text-align: center">Nut</p> </td></tr><tr><td><p style="text-align: center">12378398<br /> (in Canada, 10952414)</p> </td><td><p style="text-align: center">Rubberized Undercoating -- Paintable</p> </td></tr></table><br /> <table style='width: 100%'><tr><th><p style="text-align: center"><em>MIDSIZE SUVs</em></p> </th><th></th></tr><tr><th><p style="text-align: center">Part Number</p> </th><th><p style="text-align: center">Description</p> </th></tr><tr><td><p style="text-align: center">11517555</p> </td><td><p style="text-align: center">Bolt</p> </td></tr><tr><td><p style="text-align: center">15650961</p> </td><td><p style="text-align: center">Washer</p> </td></tr><tr><td><p style="text-align: center">11503749</p> </td><td><p style="text-align: center">Nut</p> </td></tr><tr><td><p style="text-align: center">12378398<br /> (in Canada, 10952414)</p> </td><td><p style="text-align: center">Rubberized Undercoating -- Paintable</p> </td></tr></table><br /> <br /> <br /> </td></tr></table><p></p><table style='width: 100%'><tr><td><p style="text-align: left"><table style='width: 100%'><tr><td><strong>Subject:</strong></td><td><strong>Unable To Program Tire Size In EBCM/VSES</strong></td></tr></table><br /> <br /> <table style='width: 100%'><tr><td><strong>Models:</strong></td><td><strong>2003-2006 Cadillac Escalade, EXT, ESV</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2003-2006 Chevrolet Avalanche, Suburban, Tahoe</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2003-2007 Chevrolet Silverado Classic</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2003-2007 GMC Sierra Classic</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>2003-2006 GMC Yukon, Yukon Denali, Yukon XL, Yukon Denali XL</strong></td></tr></table></p> <br /> <br /> <br /> <hr class="bbc-hr bbc-hr--3" /> <strong>This PI is being updated to add models. Please discard PIT3425.</strong><br /> <br /> <hr class="bbc-hr bbc-hr--3" /> The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/bulletins/1886090#ss1-1886090" target="_blank">[H3]Condition/Concern:[/H3]</a><br /> <br /> When programming tire size in the ebcm be advised there are three items which must be selected correctly.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/bulletins/1886090#ss2-1886090" target="_blank">[H3]Recommendation/Instructions:[/H3]</a><br /> <br /> <ol> <li data-xf-list-type="ol">It is very important that when building the Tech 2 that the proper gross vehicle weight (gvw) range is selected. The Tech 2 offers three different GVW options and they are:</li> <li data-xf-list-type="ol"><p style="text-align: left"><table style='width: 100%'><tr><td>• </td><td>"Equal to or Under 8600 GVW"</td></tr></table><table style='width: 100%'><tr><td>• </td><td>"Equal to or Under 8600 GVW PHT" (PHT is a Parallel Hybrid Truck RPO HP2)</td></tr></table><table style='width: 100%'><tr><td>• </td><td>or</td></tr></table><table style='width: 100%'><tr><td>• </td><td>"Over 8600 GVW"</td></tr></table></p> </li> <li data-xf-list-type="ol">If the vehicle is equipped with Stabilitrak RPO "JL4" select "VSES" under the Tech 2 Chassis menu NOT "ABS".</li> <li data-xf-list-type="ol"><span style="color: rgb(184, 49, 47)">On 2005 Model Year vehicles select the proper Rear Brake System "Rear Drum Brakes" or "Rear Disc Brakes".</span></li> </ol> <strong>Note: </strong>If any of the above items are not selected properly the Tech 2 will not be able to program the tire size and programming will fail.<br /> </td></tr></table></blockquote><p></p>