Possible causes for the problem are :
Shift Fork Shaft Stuck
Modulator Valve Defective
Reverse CPC Valve Defective
4th Accumulator Defective
4th Clutch Defective
Reverse Gears Worn/Damaged
Often it is the 4th clutch that is faulty.
If you are able to go for a test drive and finds that 4th gear is slipping, then that would confirm the problem.
If it is a solenoid fault, the D4 light should be blinking when vehicle is iin motion and this would be recorded in the PCM.
Sunday, June 28th, 2009 AT 4:27 AM