QuestionQUESTION: I keep getting a P0748, My mechanice changed the solenoid and relay switch 2 times, the first one worked great for three weeks and then blew out (faulty part) the mechanic replaced the solenoid again, and now the car keeps coming up with the P0748 code. It will clear for a while, transmission works fine for maybe 10 miles and then it goes into limp mode. What are we missing, it worked fine the first fix all but a bad part. do you have a solution?
ANSWER: what kinda van is this?
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QUESTION: This is a dodge ram van 1500 year 2002
AnswerI dont have a fix for this U will need to take it to some one that knows what they are doing with tranny work here is the list of possible causes.
P0748-PRESSURE SOL CONTROL/TRANS RELAY CIRCUITS
When Monitored: Continuously with the key on.
Set Condition: This code will set if the voltage detected on the Governor Pressure
Solenoid Control circuit at the PCM is different than the expected voltage.
POSSIBLE CAUSES
P1765 DTC PRESENT
INTERMITTENT GOVERNOR PRESSURE SOLENOID
TRANSMISSION RELAY OUTPUT
FUSED B+ CIRCUIT OPEN
GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT OPEN
GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT OPEN INTERNAL
TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN
GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO GROUND
GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO GROUND INTERNAL
TRANSMISSION RELAY OUTPUT CIRCUIT SHORT TO GROUND
GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE
GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO SOLENOID CIRCUITS INTERNAL
GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS
GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS INTERNAL
TRANSMISSION CONTROL RELAY - POOR CONTACTS
PCM - GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT
