Originally Posted by dpkieffer
I have a 2006 Durango with a 4.7L and the RFE transmission. The transmission went into limp home mode for the wife on Friday (stuck in third).
Most of the consensus online I've seen is that the P0750 (faulty shift solenoid A) points to replacing the shift solenoid pack in the transmission.
Is there anything else that could cause this fault that I should check before dropping the pan?
Full definition of code and possible causes.
P0750-LR SOLENOID CIRCUIT
Theory of Operation
The Transmission Control System uses six electronically controlled solenoids that allow hydraulic fluid to be applied to various friction elements (clutches), which enables the gear requested. The continuity of each solenoid circuit is periodically tested. Each inactive solenoid is turned on for a few milliseconds, then off. Each active solenoid is turned off for a few milliseconds, then on. This pulsing of voltage to the solenoid causes an inductive spike which can be sensed by the Transmission Control System. If an inductive spike is not sensed by the Transmission Control System during the continuity check, it is tested again. If the test fails three consecutive times, the appropriate Diagnostic Trouble Code (DTC) is set. If the solenoid test is run in response to a gear ratio or pressure switch error, one failure will result in setting the appropriate DTC.
- When Monitored: Initially at power-up, then every 10 seconds thereafter. The solenoid circuits will also be tested immediately after a gear ratio or pressure switch error is detected.
- Set Condition: After three consecutive solenoid continuity test failures, or one failure if test is run in response to a gear ratio or pressure switch error.
- NOTE:This DTC is strictly an electrical fault and cannot be caused by any internal transmission failure other than an open in the Transmission Solenoid/TRS Assembly. If the Transmission Solenoid/TRS Assembly is in need of replacement — do not replace the Valve Body.
RELATED TCM POWER INPUT DTCS PRESENT
(T20) L/R SOLENOID CONTROL CIRCUIT SHORTED TO OTHER CIRCUITS
(T20) L/R SOLENOID CONTROL CIRCUIT OPEN
(T20) L/R SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
TRANSMISSION SOLENOID/TRS ASSEMBLY
POWERTRAIN CONTROL MODULE (PCM)