My service engine light came on the shop said the code is P1740 but did not know what it meant also when driving in over drive at a steady speed the engine rpm go up and down appox 500-600 rpms also when I step on the gas to increase speed the heater door falls shut and no heat comes out of the dash as soon as I leasve off throttle the door opens and heat or a/c comes out the dash vents are all thease items related to each other thanks 2001 Dodge Ram 2wd drive small v8 engine
The transmition is slipping, dodge trucks are noted for their tranny problems, I just replaced mine ($2400)bearly over 100,000 miles on the truck. Watch the engine temp if you keep driving it. It may start to over heat. Get it to a reputable transmition shop ASAP,Some place that garentees/warentees their work.
As for the heat/AC I would check for vacuum leaks. Get either a Hanes or Chilton's manual for it and it will tell you how to check the system.
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it can be 100s of reasons he will need to have the trouble code read most auto stores offer this service for free but with the blinking light meant the problem should be addressed immediately --it can be from a bad spark plug to a transmission problem have the code rad as soon as possible to avoid larger problems
This default is for the transmission operation. The diagnostics detected an out of range condition. It can be a wet electric connector for the shift solenoids, or the flat cable to the trans, or a weak ground. Even an early indication of problems with the Torque Converter lock-up.
The further check will involve taking electric resistance measurements when the connector plug is apart.
You can try using an electrical cleaner and reconnecting the plug. Check ground straps for corrosion.
Clear the computer and drive it for effect. If it comes back on you will need to investigate deeper.
Hi Sc, The job is labour intensive and may solve the problem. I wonder if the fluid in the tranny has ever been replaced? It's meant to be replaced at least once a year. If it smells burned have it replaced. Ask your shop to check the gearbox and engine mountings and in the event of your vehicle having rear wheel drive, the universal joints on the prop shaft. Regards John
Four digit codes are brand specific. The only info I have on 1740 for a Ford product involves the transmission but not a specific part. Its possible the code was a fluke since it went off, but I would want someone to check it out just in case.
The only reasonable part is the labor charge. I couldn't second-guess the shop's recommendation, maybe both parts are needed, but you could have them replace the shift solenoid, and try driving it for awhile, see what happens. Then if you need the TCM, try a used one from a salvager for less than half the cost of new. That is something you could install yourself. Whatever you decide, good luck.
i think you answered your own question.. torque converter clutch or overdrive solenoid. also your overdrive band could be a little worn and about ready to **** the bed for good but i'd check the other things. if you had transmission work done on it before when they put the torque converter on maybe it didn't get re-seated properly. push and turn it will click do it 2 more times clicking a total of 3 times