Question about 2005 Chrysler 300

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2002 chrysler seabring 2.7 involved in accident. ran into rear of another auto. minor (no repair) to psg side fender. had to replace front bumper, radiator support and left headlight. after driving two or three days the check engine light came on and the transmission would not work in forward or reverse gear. redings: PO700,720,734 and 740. changed output speed sensor and now works ok in forward gear. reverse does not work. understand reading do not concern reverse gear. was advised that pcm may have been damaged in accident since unusual so many 700 series reading would occur at one time, and may have locked the reverse gear. need a second opinion before i purchase a pcm since so expensive. i do understand there is no guarantee new pcm will fix problem----but they it is a strong possibility

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  • majmo34 Apr 25, 2010

    one last question......when driving the car home, without warning the rpm went way up like the car transmission had been put in neutral (it had not) and the car slowed down...pulled over to the side of the road and turned the car off. waited a few minutes and drove the car home, about 12 miles and everything operated normal. the next morning when the car was started none of the gears would engage....after replacing the output speed sensor and another sensor i understand was the input sensor the cars forward gears worked ok....thats when we noticed the reverse was not working. I am asking this question only because i thought it may add something to initiat information...thank you

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Hello. The pcm is most likely the solution to your problem. Get at least one more chrysler dealership to give you an estimate on the repair and ask what warranty or guarantee they have. Joe

Posted on Apr 25, 2010

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Check all the plug in connections that you see under the hood especially the ones going to the transmission and transmission comp=TCM become a faulty connection or bad comp can cause the transmission to not engage into gear but from the codes it sounds the torque converter and solenoid pressure switch pack or module inside the transmission is acting up.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks:
1) Once in a particular gear, if the gear ratio varies from the correct gear ratio, the corresponding in-gear trouble code is set (DTCs P0734). 734 is "Gear 4 Ratio Incorrect".
2) An excessive change in input or output speeds indicating signal intermittent may result in the DTCs P0715 and/or P0720 being set.
3) If the common speed sensor ground circuit is lost, both sensor inputs will read the pulses from the input speed sensor when at a stop in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause
the DTC P0740 to set. DTC p074 does indicate "torque Converter Clutch (TTC) no RPM drop at lockup". What this means is the TCC is engaged, but there is no engine speed drop when it does.

Once you have checked all the wire harnness, then inspect the PCM/TCM for any signs of damage, most salvage yards sell the PCM/TCM for around $30.00.

Thank you for using fixya and keep me posted, be glad to help you get your car running 100%

Posted on Apr 25, 2010

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