Possible causes

– Low transmission fluid level
– Dirty transmission fluid
– Faulty Low Reverse solenoid valve
– Low Reverse solenoid valve harness is open or shorted
– Low Reverse solenoid valve circuit poor electrical connection

Tech notes

When the a transmission solenoid is malfunction, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.

When is the code detected?

The P0750 code is detected when TCM detects three consecutive solenoid continuity test failures, or one failure if test is run in response to a gear ratio or pressure switch error

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Transmission will not shift gears.

P0750 CHRYSLER Description

The Low Reverse (LR) is monitored at initially power-up, then every 10 seconds thereafter. The solenoids will also be tested immediately after a gear ratio or pressure switch error is detected.