Jim Mobley, Author at Transmission Digest
Diagnosing Chrysler transmission max line pressure and P0933, P0869, P1745 codes

This article applies to Chrysler RFE, RLE and TES transmissions that utilize pressure control solenoids (PCS) for line pressure control. The subject is a rather common electrical fault that may occur on the PCS line pressure solenoid circuit, which results in max line pressure. Diagnosis and correction of a max line pressure condition may become

How to fix GM 8L45/8L90 no-move and no-pressure conditions

By now you may have heard of, or even experienced, a GM 8L45 or 8L90 transmission with a no-move or no-pressure condition. Conditions of no movement or no pressure after repair have plagued this unit since its inception. Here’s what you can do about them. Condition 1: No movement after fast learn or programming If

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How to get started with OE ECU reprogramming

The conversation goes like this: I have been paying mobile programmers or remote access programmers (RAPs) far too long. I believe I can save money and time by doing this myself. What type of equipment is needed and what is the cost to get up and running? Let’s find out! In a nutshell, four basic

Ford 6R140: Repairing the elusive intermittent neutral condition

The 6R140 has been in large Ford trucks since 2011 and is now considered a common unit in most shops. Our discussion today concerns the elusive intermittent neutral condition. At one particular time, this complaint was so common at one particular California utility company with a fleet of trucks that there seemed to be no

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Diagnosing the infamous GM 8L45, 8L90 3-4 neutral

Today we are examining what we’ll call a “Twilight Zone” transmission complaint: an issue that appears out of nowhere while performing a small, insignificant repair and initially makes little sense. The 8L45 and 8L90 3-4 Neutral condition, which has been baffling many shops/techs, is one such complaint. Problem: 3-4 Shift is Neutral after installing a

Troubleshooting Ford 6F35 torque converter one-way clutch failure

It is Friday afternoon at Cooter’s Transmission, and the last of the day’s jobs are being wrapped up. Everyone is getting ready for spirits and good food at Buster’s Pub. A Ford 6F35 from a 2015 Ford Explorer rebuilt earlier in the week is installed, and something is not right. John, the installer, puts it

A ghost in your vehicle: Troubleshooting errant voltage from Chrysler TIPM

Many of you may have already experienced various shortcomings from Chrysler’s Totally Integrated Power Module (TIPM). The TIPM contains fuses/relays and integrated circuits that allow for programmed control and distribution of power to components on Chrysler vehicles. The TIPM does not have processing power; it’s mainly a delivery and storage device with vehicle data stored

How to set up a Snap-on scanner for Dodge Secure Vehicle Gateway protocol

If you have tried to scan a 2018 and later Chrysler/Dodge vehicle, you may have found a notice on your scanner saying that the Secure Gateway is locked; you can only read codes and are unable to perform clearing of codes or resets. Chrysler is the first company to implement this, and others may follow

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