{"id":35120,"date":"2017-01-23T18:06:34","date_gmt":"2017-01-23T23:06:34","guid":{"rendered":"http:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=35120"},"modified":"2017-01-23T18:06:34","modified_gmt":"2017-01-23T23:06:34","slug":"od-light-flashing-p0755-p0753","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/01\/od-light-flashing-p0755-p0753","title":{"rendered":"OD light flashing with code p0755 and p0753"},"content":{"rendered":"

\"2003I’ve replaced all transmission solenoids and fluids. I am still getting codes p0755 and p0753 and o\/o light flashes when I drive. The transmission is shifting but not as smooth as I think it can. I am\u00a0 thinking the ECM<\/a> is faulty. Is that possible or should I look elsewhere? I need to get these codes cleared so I can smog it. I have cleared the codes with the diagnostic tool but same codes come back and flashing o\/o light. It is a 2003 Ford Crown Victoria P71 Police Interceptor.<\/p>\n

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RESPONSE<\/p>\n

I think the o\/o light you are talking about is actually the O\/D light. This stands for Over Drive.<\/p>\n

O\/D Off light flashing<\/h3>\n

Most likely cause<\/h5>\n

In later years of this model production (aprox. 1995-2003) these vehicles were equipped with either a 4R44E transmission or (1999 and later) a 5R55E transmission. The former has a speed sensor located near the tail shaft housing that, when going out or has gone out, will cause the O\/D Off light to flash intermittently or constantly. On the latter (5R55E) this sensor is located inside of the transmission and will cause the same symptoms. This sensor helps the computer to determine proper shift points. In conclusion a bad sensor can cause hard shifting<\/strong>, delayed shifting or even failure to shift, resulting in premature transmission failure. Therefore replacing the VSS – Vehicle Speed Sensor<\/a> might be the best move.<\/p>\n

Ford Code P0755 – Shift Solenoid 2 Circuit Malfunction<\/h3>\n

The P0755 code is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve. Shift solenoid valve 2 is turned ON or OFF by the Transmission Control Module (TCM) in response to signals sent from the park\/neutral position (PNP) switch, vehicle speed and Engine Control Module (ECM) (throttle opening). Gears will then be shifted to the optimum position.<\/p>\n

Ford Code P0755 Possible causes<\/h4>\n