![]() ![]() Older Jeep vehicles that use a 42RE or 42RLE 4-speed automatic transmission have a widespread issue with delayed or failed gear shifts. For example, you may not shift at all or go in gear.īased on our research and experience with Jeep vehicles, here is a list of the most common problems with Jeep transmission and possible causes. Wire harness – Damages of wire harnesses from ECU / PCM to the transmission housing can cause shifting problems.This is a common problem for your particular transmission a Jeep dealer may have a software update to fix such shifting problems. Transmission may shift too late or gears to drop unexpectedly. PCM / TCU / ECU Software Issue – Software issues can cause erratic shifting or downshifting issues.Low Battery Voltage – In rare cases, the low voltage can trigger the automatic transmission to get stuck in limp mode.Brake Light Switch – A faulty brake light switch can prevent the shifter from moving out or back in Park.Sign from the VSS is sent to the Powertrain Control Module (PCM), and the last signal can cause one or more of the previous systems. ![]() Faulty Vehicle Speed Sensor – If your Jeep has developed a harsh shift or is stuck in emergency mode (limp mode), the vehicle speed sensor (VSS) may be the problem.The transmission may not shift at all or harsh shifts between gears or specific gears. Depending on the competent that fails, it can cause limp mode. Defective Valve Body – The valve body is very complex and can fail in several ways.Shifter Module – A faulty shifter module or cable can cause the transmission to get stuck or not go in the selected gear.Worn Bands – Can cause delayed shifting, shifting at high RPM, harsh shifting, no gear at all, and no reverse.Faulty Torque Converter – This can cause the Jeep transmission to slip in all gears, shudder, and even overheat.Low transmission fluid level – Low transmission fluid level can cause several issues, including erratic shifting, no-shifting, delayed shiting, strange grinding noises, limp mode, and even checking the engine light to come on.Common IssuesĬommon problems that often cause Jeep transmission problems: Let’s take a look at common problems that Jeep owners often face. The same symptoms can also indicate a severe transmission problem, such as a faulty valve body, work, clutches, and a faulty torque converter. Transmission problems on Jeep vehicles, such as erratic shifting, slipping, delayed shifting, and no shifting, are often caused by low transmission fluid levels. ![]()
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