Questions and Answers

Dodge DTC P0720 Q. I have a 1999 Dodge Dakota Sport and the Check Engine Light (MIL) has been on for a few months but I never thought much about it since I don't have a warranty. This morning the engine would turn over but not stay started, thus it would die. I found out it is the P0720: Output Speed Sensor Circuit Malfunction.

I have no clue as to how to fix this nor where this Circuit is located. Any help would be appreciated and I can pretty much fix it on my own as long as pointed in the right direction. Much thanks!

Best regards,
Bill

A. Okay then Amber, let's see if I can get you pointed in the right direction. First, here is DTC P0720 explained.

P-0720:
Low Output Speed Sensor (OSS) RPM above 15 mph.

WHEN MONITORED:
Continuously with the key on, engine running, and gear selector not in park or neutral.

SET CONDITION:
This code is set if the vehicle speed (as determined from the vehicle speed sensor), is above 15 mph , and the output shaft speed is below 60 rpm for 2.6 seconds.

POSSIBLE CAUSES:
• OSS defective
• OSS ground circuit open
• OSS ground circuit short to ground
• OSS signal circuit open
• OSS signal circuit short to ground
• Park-neutral switch code present
• PCM defective (OSS signal ckt def)
• Powertrain Control Module defective
• OSS harness intermittent defect

Most likely it's a bad OSS. The OSS is located on the back of the transmission.