Ranger Transmission Indicator Issue

Greetings! I am sorry to hear that you are experiencing this vexing predicament with your Ranger. I recall experiencing analogous complications with the automatic transmission in my Ford Ranger, and I wish to share some of my observations which may prove beneficial to you. My Ranger presented with similar symptoms, including the illumination of warning lights and aberrant shifting behavior. Have you scrutinized the cooling fan and the radiator coolant pressure sensor for any anomalies? In my experience, such components are often implicated in the types of issues you have described. Also, I might ask, have you examined the wiring harness leading to the transmission? Defective wiring or corroded connectors can indubitably engender erroneous readings and consequent malfunctions.

Thanks for the detailed reply! You mentioned checking the cooling fan and pressure sensor. Could you elaborate on what exactly I should be looking for? Any specific tests or visual cues that would indicate a problem? And regarding the wiring harness, is there a common spot where these things tend to fail?

Certainly. When examining the cooling fan, ensure it is operating optimally and not exhibiting any unusual noises or vibrations, as this may indicate a mechanical failure that could indirectly influence the radiator's efficiency. For the radiator coolant pressure sensor, meticulously inspect it for any signs of physical damage or corrosion. Using a multimeter to verify the sensor's electrical signal would be prudent. Regarding the wiring harness, particular attention should be directed toward areas near the exhaust manifold and other heat sources, as these are often susceptible to degradation. Furthermore, connectors are frequently prone to corrosion, thus requiring careful inspection. In light of the complexities inherent in diagnosing such matters, seeking counsel from a competent automotive workshop may ultimately prove to be the most judicious course of action.

Thanks a lot for the advice, it really helped narrow things down. Turns out it was a corroded connector on the radiator oil pressure sensor, just like you suspected. A quick clean and a new connector later, and everything's back to normal. Cost me 95€ at the workshop. Appreciate the help!