PSOM? Intermittent code P0500/speedo loss
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Cargo Master
Joined: Mar 2010
Posts: 3,330
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From: Laramie, WY
PSOM? Intermittent code P0500/speedo loss
1996 F150 351W/E40D 4X4. 333,000 miles. Halfway through a 900 mile drive yesterday my truck lost speedometer function while cruising along the interstate and the odometer went blank. The speedometer pegged to maximum. Torque converter unlocked. Overdrive light began flashing. I slowed down, and plugged in my code reader. Found a pending code for P0500 (VSS malfunction). I pushed the O/D OFF button, trans shifted to third, then pushed it again, and the trans was very obviously in limp mode, with a very firm shift back into overdrive. Trans temps were typical, 145F and 150F (two sensors?). I was looking for the next exit, and wondering about the PSOM, then thumped the dash...and the speedo function recovered. Drove the next 400 miles without issue.
Where should I start? Is there a likely bad ground in my instrument cluster?
Where should I start? Is there a likely bad ground in my instrument cluster?
Lead Driver
Joined: Jan 2019
Posts: 5,075
Likes: 864
From: N.W. Alabama
Did you run into a lot of rain, a TSB talks about water intrusion into connectors,
TSB 96-21-11
This may help -->1983 Ford Bronco PSOM picture | SuperMotors.net
TSB 96-21-11
This may help -->1983 Ford Bronco PSOM picture | SuperMotors.net
Thread Starter
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Cargo Master
Joined: Mar 2010
Posts: 3,330
Likes: 292
From: Laramie, WY
Did you run into a lot of rain, a TSB talks about water intrusion into connectors,
TSB 96-21-11
This may help -->1983 Ford Bronco PSOM picture | SuperMotors.net
TSB 96-21-11
This may help -->1983 Ford Bronco PSOM picture | SuperMotors.net
Thread Starter
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Cargo Master
Joined: Mar 2010
Posts: 3,330
Likes: 292
From: Laramie, WY
Awesome, thanks. I'll pull it out and look things over next chance I get.
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