P0503 Code & Trans shifting issue
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From: Downingtown, PA
P0503 Code & Trans shifting issue
Hello, I have a 1997 F-150 4X4 with the 4.6 l V-8 and the 4R70W trans. 125 K miles. The issue I am having is the trans. shifting through the gears very quickly. By the time the truck gets to 35 MPH it's in OD. Also, if I come to a quick stop the trans seems to still be in a higher gear. Sometimes the truck will almost stall. I have a P0503 VSS Circuit Fault code and a P0600 Serial Communication Link Fault code. I have access to a higher end Autel scanner. When I monitor the vehicle speed on the scanner the speed readout sometimes spikes when coming to a stop. It shows a maximum speed of 631 MPH. (Not bad for an F-150). Also if I accelerate hard from a stop the readout speed will immediately spike to 30 - 35 MPH. The speedometer on the dash seems to read correctly. .. From all I have read, I thought the VSS that was defective was the one on the side of the transmission. I replaced it and it made no difference. Have I replaced the wrong sensor? Is the one on the tail shaft of the transfer case the one I should have replaced? Thank you, George
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larryejoh
1961 - 1966 F-100 & Larger F-Series Trucks
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Mar 26, 2013 01:53 AM
