{"id":6902,"date":"2022-09-20T12:00:35","date_gmt":"2022-09-20T19:00:35","guid":{"rendered":"https:\/\/mitchell11.wpenginepowered.com\/blog\/shopconnection\/suretrack-real-fix-careful-disassembly\/"},"modified":"2025-01-03T11:20:51","modified_gmt":"2025-01-03T19:20:51","slug":"suretrack-real-fix-careful-disassembly","status":"publish","type":"shopconnection","link":"https:\/\/mitchell1.com\/shopconnection\/suretrack-real-fix-careful-disassembly\/","title":{"rendered":"SureTrack Real Fix: Careful Disassembly"},"content":{"rendered":"

\"\"<\/a>Real Fixes from Mitchell 1’s SureTrack\u00ae<\/a> expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is available at no additional cost in our ProDemand<\/a> product.<\/p>\n

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When following the factory procedures for repairs, be sure to read all the notes, cautions and warnings provide. It might save you some grief in the end. SureTrack community member cgorzsas<\/strong> had a Jeep Liberty in their shop that came in with ABS issues even after repeated attempts to repair it. They posed the question to the community, and with the help of fellow community member Skip<\/strong> and others, they were able to resolve the issue quickly.<\/p>\n

The following Community Fix summarizes the interaction between members of the community that led to the solution.<\/p>\n

Vehicle<\/strong>
\n2012 Jeep Liberty Sport 3.7L<\/p>\n

Title<\/strong>
\nRepeat failure of HCU, replaced with assembly.<\/p>\n

Complaint<\/strong>
\nCustomer complains that ABS light is on.<\/p>\n

Diagnostic Steps Performed\/Parts Replaced<\/strong>
\nNo speedo function, ABS & Traction lights on with no communication with scan tool and other modules on network. Found bad ABS module
\nReplaced antilock brake module (ABM) with dealer part. Did initialization and ABS works with good speedo function, but now have code C121D for brake pressure sensor. Brake pressure PID reads -300 psi. Clear code and comes back. Removed module from hydraulic control unit (HCU) and it still reads -300 psi. Do we have a bad module or HCU? Brake pressure sensor may have been damaged when installing module. Procedure did not state module and HCU had to be removed together as assembly. Another source states both must be removed as assembly before module replacement. Is this procedure correct?<\/p>\n

Best Answer from Community Member Skip<\/strong>
\nFound this caution in the procedure provided. When removing ABM from HCU, be sure to completely separate the two components (approximately 38 mm (1.5 inches)) before removing ABM. Otherwise, damage to the pressure sensor will result requiring HCU replacement.<\/p>\n

Cause<\/strong>
\nHCU damaged when separating from ABM.<\/p>\n

Correction<\/strong>
\nWe ordered a salvage yard ABS\/HCU assembly, installed it as an assembly and bled the brakes. Took for test drive and problem solved. The brake pressure sensor on HCU must be extremely delicate and can be damaged even if you are careful when installing a module.<\/p>\n

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SureTrack\u00ae adds to the power of ProDemand\u00ae<\/a> with an exclusive combination of real-world knowledge and powerful diagnostic tools, all wrapped in an interactive community of professional technicians. Designed to help automotive shops increase accuracy and efficiency from diagnosis to completed repair, the industry’s most comprehensive repair information resource is just a few clicks away.<\/p>\n

Want more? Here’s how you can see more Real Fixes in SureTrack:<\/strong><\/p>\n