How can I troubleshoot my Infiniti transmission problem?

Troubleshooting Infiniti transmission problems requires at minimum a diagnostic scanner that can read transmission fault codes. In this guide, we go over common problems and steps to help you troubleshoot Infiniti transmission problems such as limp mode, no shifting, delayed shifting and slipping.

What kind of transmission does an Infiniti have?

This is a common mistake that happens during various repairs. Front-wheel drive Infiniti vehicles with 5 speed automatic (AW55-51SN) transmission can suffer from harsh and delayed gear shifts between all gears. In most cases, the car will run fine while cold, as this problem will show up after warming up.

Why is there no shifting in my Infiniti?

Erratic shifting or no shifting can indicate a more serious problem, such as a faulty valve body and a bad torque converter. Troubleshooting Infiniti transmission problems requires at minimum a diagnostic scanner that can read transmission fault codes.

Why does my Infiniti go into limp mode?

Low Battery Voltage – In some cases, the low battery voltage can trigger Infiniti automatic transmission to get stuck in limp mode. PCM / TCU / ECU Software Issue – Software issues can cause erratic shifting or downshifting issues. Infiniti transmission may shift to late or gears to drop unexpectedly.

What causes a bad speed sensor on an Infiniti?

Faulty Vehicle Speed Sensor – If your Infiniti has developed a harsh shift or is stuck in emergency mode (limp mode), the vehicle speed sensor (VSS) may be the problem. Sigan from the VSS is sent to the Powertrain Control Module (PCM), and the last of the signal can cause one or more of the previous systems.

What happens when a Infinity switch goes bad?

All Infinities have electronically controlled transmissions. If the switch is bad, the computer does not receive the correct signal to shift into reverse. Those switches can go bad over time, due to corrosion or gunk getting them stuck. A quick fix would be shifting from “Park” to “Low” very fast, several times.

Why is the transmission switch on my Infinity not working?

Check the transmission selector switch on your Infinity. All Infinities have electronically controlled transmissions. If the switch is bad, the computer does not receive the correct signal to shift into reverse. Those switches can go bad over time, due to corrosion or gunk getting them stuck.

Why is my Infiniti transmission stuck in 3rd gear?

Older Infiniti vehicles with 4-speed automatic (RE4F04B) transmission suffer from issues stuck in limp-home mode. Transmission gets stuck in 2nd or 3rd gear and will no longer change gears. This may happen immediately after starting the car or while driving.

When do I change the trouble code on my Infiniti?

A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later numeral appears on the display 1.3 seconds after the former numeral has disappeared. A change from one trouble code to another occurs at an interval of 1.8-second OFF.

Where is diagnostic trouble code stored in Infiniti?

If a malfunction occurs within the ECU/fuel injection system, a diagnostic trouble code may be stored in the ECU and the ‘‘Check Engine’’ lamp will blink. There is also a lamp built into the ECU which will concurrently blink. To read Code output, proceed as follows: Turn ignition On, but do not start engine.

What does it mean when your transmission solenoid is stuck?

If the trouble code is telling us that it’s stuck or an electrical problem, it is most likely a wiring or shift solenoid problem. A lot of the shift solenoid codes could be solved by trying to make a transmission fluid replacement or a carry out a transmission flush.

Where is the diagnostic trouble code located on an Infiniti Q45?

On J30, M30 and Q45 models, the ECU is located behind the RH kick panel. If a malfunction occurs within the ECU/fuel injection system, a diagnostic trouble code may be stored in the ECU and the ‘‘Check Engine’’ lamp will blink. There is also a lamp built into the ECU which will concurrently blink. To read Code output, proceed as follows:

What is Infiniti check engine light code p1490?

P1402 EGR Function (Open) – Read Our Article On EGR Valve Codes For Help With This Infiniti Check Engine Light Code P1490 Vacuum Cut Valve Bypass Valve (Circuit) – Read Our Article On Automotive Circuit Testing For Help With This infiniti Check Engine Light Code

How to read a malfunction code on Infiniti?

Wait two seconds, then rotate switch to full counterclockwise position. A malfunction code can be read as the long (0.6 second) blink, indicating the first digit of a two digit number and the short (0.3 second) blink, indicating the second digit.

Where is the diagnostic mode switch on Infiniti?

A second, though more time consuming method of clearing Codes involves using a small screwdriver to turn the diagnostic mode selector switch, located on the side of the ECM/ECU, fully clockwise. After waiting two seconds, rotate the switch to the full counterclockwise position.

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