Eaton Transmission Fault Code 88
Introduction
Eaton transmissions are a popular choice among truckers, providing reliable performance and efficient operation over long distances. However, from time to time problems can arise, and one of the most common issues is a fault code 88. In this article, we'll explain what a fault code 88 is, what causes it and how to repair it.
What is Fault Code 88?
Fault code 88 is an indication of a problem with Eaton transmissions, specifically that the transmission control module (TCM) has detected a problem with the transmission's output speed sensor (OSS) or the transmission itself. It's important to note that code 88 is a generic code and may be used by different types of Eaton transmissions.
What Causes Fault Code 88?
In most cases, fault code 88 is caused by a problem with the transmission's output speed sensor (OSS). The OSS is responsible for monitoring the transmission's output speed and when it detects a discrepancy, it will set a fault code 88. Other potential causes include a problem with the wiring or connections between the TCM and OSS, or a faulty TCM.
How to Repair Fault Code 88
The first step to repairing fault code 88 is to diagnose the underlying cause. This can be done by connecting a scanner to the transmission's diagnostic port and checking for any stored trouble codes. If there are any codes present, they should be addressed before attempting any repairs.
Once the underlying cause has been identified, the repair process can begin. If the problem is due to a faulty OSS, it should be replaced. If the problem is due to a faulty wiring connection or a faulty TCM, then the wiring should be checked and the TCM should be replaced if necessary.
Common Issues to Look Out For
When repairing fault code 88, it's important to keep an eye out for any other issues that may be present. Some common issues to look out for include a faulty solenoid, worn or damaged internal components, excessive wear on the transmission's input or output shafts, and any other issues that may be causing the transmission to run abnormally.
Conclusion
Fault code 88 is a common problem with Eaton transmissions, and it's important to diagnose and repair the underlying cause as soon as possible. In most cases, fault code 88 is caused by a problem with the transmission's output speed sensor, but other potential causes such as faulty wiring and a faulty TCM should also be considered. Once the underlying cause has been identified, the repair process can begin and any other potential issues should be kept in mind.
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