Re: 2003 grand caravan transmission will not shift out of...
It sounds as though your transmission input and output sensors are faulty.they are located on the driver side of transmission.input at front of trans.output at rear of transmission. normally if input sensor is faulty trans will stay in limp mode. if output sensor is faulty speedo will not register. they both resemble temp sensors with elec connectors
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Assuming that your van is driving smoothly and your gears are shifting smoothly, start by checking your tranny fluid level. If it is low, that may be one of a few possible problems. If fluid level is fine, your speedo sensor may have a loose connection or could be going out which is what may be triggering the check engine light. I had that happen on my Jeep Cherokee. Speed sensor stopped working and the light was on constantly. Remember, if your speedometer sensor does not work, your odometer and trip meter will not turn either. Speedo sensors are not very expensive and pretty easy to change. Start with the easy tasks first: check fluids, check connections, replace sensor. If that doesn't work, get it into a shop (or talented and well tool-supplied buddy) and get a code(s) for the problems. Good luck!
unplug the trailer first to see if it is something in it''s wiring. not going into OD could just be that the load is too much to handle in OD. speedo and tach I would start by checking fuses. sounds like the problems are all related.
There is a speed sensor which will give off this code. It would explain why the speedo is not working. For the trailer light relay, I would agree with you about the water issue. For that problem you need to start eliminating power to the plug because something is backfeeding up to the light relay.
If you have an Electric brake controller see if you can shut that off and if the buzzing goes away you know you are shorting out through the wiring or plug. Probably for the amount of time it takes to trace down everything you are going to be unwrapping, the wire loom and splicing in another wire anyway. Why not just replace everything from the trailer plug to the cab and be done with it for years? With what you have now the best you can do is patch in a new wire: they don't really give you enough slack to put on a new plug.
BJB ( aka Battery Junction Box , engine compartment fuse panel ) fuse #5 is for the trailer tow reversing lamp relay & the trailer tow running lamp relay. This is to the normally open contacts on those relays, which is the circuit to the 7 pin trailer tow adapter. - Have you checked your 7 pin trailer tow adapter for metal left in there from a trailer plug ? If you pull those 2 relays and replace fuse #5, does the fuse blow ? If so under what conditions ( i.e. when the headlamps are turned on, or when the truck is placed in reverse ) ?
BJB Fuse # 6 feeds the park lamp relay & the headlamp relay for the autolamp function. This could be where the lights staying on it coming from, but I would have guessed just the autolamp would have stopped working. When the parking lamps are staying on, is this with the main headlamp switch in the auto position, or with the switch turned off.
The blinking OD light is the transmission reporting an error ( trans sensor issue or the actuator circuits have failed ).
The 1st place to check for this ( which is somewhat connected to the BJB Fuse #5 ) is the DTR ( Digital Transmission Range ) Sensor on the side of the transmission.
Could be the DTR connector is gummed up with road dirt, causing an issue. Part of the DTR is for starting ( Neutral or Park acts as a switch ) and part is the reverse ( again acting like a normal switch ) the other parts of the DTR feed information to the PCM for shift control and for 44 ( if the truck is a 4x4 ) for shift operation.
Start with the DTR on the side of the trans, unplug the connector and clean it with contact cleaner, and the check on the relays above.
Please report back your findings as a comment on this problem.
Had same problem with my 2000 dodge stratus 2.4 liter and transmission would not shift out of 1st gear. Solution was ignition fuse under the hood was blown, one side of fuse working, replaced 10 am fuse everything works, tach, speedometer, gas gauge and transmission started back to shifting.
Sounds like a speedo gear in the transmission ... I think the tahoe one had a speedo cable the speed sensor is located in the speedo ... will cause all those to fail if speedo is not working as did in my Astrovan
I had a similar problem on a Ford Taraus. The car wouldn't shift when the speedo wasn't working. When the speedo decided to work then the transmission shifted fine. The problem and Fix it I found was because the Speed Odometer Sensor on the Transmission wasn't working so the computer was flying blind as to how fast the car was moving (not knowing when to shift) and therefore the computer placed the transmission into a "Safe Mode." When I realized what was happening I changed out the sensor and the car has never shifted so fine.
Check your battery terminal connections. Because so much of these trucks are computer controlled a bad connection at the battery will cause alot of electrical bugs. I had to replace my transmission about a year ago. Just prior to having that done my speedo was going crazy at times. The brake warning light usually means you have one or more calipers that need to be replaced. Start with the battery terminal connections.
your fluid is low and quite possible you seized your tranny up apply fluid and dont just rely on dipstick for this make sure the tranny is full of fluid
your linkage to transmission might have come apart another reason for no shifting
now for the speedo
there is a little device that connects speedo cable to the tranny and then the mechanical of tranny from there is called a speedo bullet
if you seized your tranny the speedo bullet would have gotten sheared off in side the speedo bullet is wrenched on and can be wrenched off replace the bullet speedo should start working again