Brakelight and abs lighgt are on

You need a new transmison your bands have stretched or wore

bad abs sensor you have to replace hub bearing.

I think it is most likely a wiring problem causing this. Titans are notorious for having the exhaust rust through after the muffler. I would trace the passenger side wiring harness back and check for fused together wires. I take it your Titan is a floor shifter not a column. If so I suggest taking the circular cap off right by the shifter (shift interlock over ride). If you can put a key in and compress the over ride then you should be able to shift through gears to rule out a transmission problem. No maf sensor would cause this, nor would a bad transmission. Make sure to check all fuses that are labeled electronic parts, they are connected to your interlock system. The abs and wheel speed sensor is what is making it impossible to shift into 4x4 . All of these problems are separate fuses, but the wires are all in the same harness running past the exhaust.

No, the valve setup is different and the shift points are different, the control unit won't work properly and the speedo will read incorrectly due to differences in ratios

sounds like your shift interlock has malfuctioned....press the brake and listen for a clicking noise at the base of the shifter if no click is heard...its solenoid has failed...if it does click...try taping breaks several times while trying to shift it out of park...

Your ABS system has detected a fault in the system. When that happens, the TC is automatically turned off. You will have to have the ABS diagnosed and repaired before the TC will come on again.
Good luck.

the must likley cause is the speed sensor in the rear axle we replace the output speed sensor as well in the transmison they work with each other to shift the tranny

The gear-shifter solenoid or brakelight switch has failed.

To check the brakelight switch, start the car and step on the brake. If the brakelights don't come on, the switch is faulty. You'll find the switch under the dashboard above the brake pedal.

If the brakelights came on, your shifter solenoid is probably bad. In this case, here's a quick-and-dirty fix to get you moving...

Look for a small plastic cover next to the gear shift. Pop this off with a fingernail or small flat screwdriver. There will be a hole beneath the cover. Push a small screwdwiver down that hole untill you feel some resistance. You should now be able to shift out of park.

Be warned...this trick allows a shift even without touching the brake. So get the solenoid fixed as soon as you can.

Good luck !

Marco

same problem here, found 3 places that say it is the abs sensor:

Had this problem with my 1999 Ram 1500. There is a sensor at the top of the rear differential for the ABS system. That sensor went bad and replacing it took care of the problem. What caused mine to go bad was apperantly water got into the differential when launching and loading my boat. check to see if gear lube needs to be replaced also.
The answer above is perfectly correct. When the ABS sensor on the diff goes bad the speedo no longer will work, the odometer stops recording mileage and both brake and ABS light comes on. You also loose O/D or "Lock-up" in the torque converter. The sensor is inexpensive and can be changed in about 30 mins. Good Luck!

The fix for your truck is the ABS speed sensor located in the top of the differential housing , held in with one stud . Your speedometer is calculated through the ABS controller. Replacing that sensor will fix your problem.

just the engine or the transmison as well