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I'm with the others, and especially Subyblue on the concept that things happen. And yes, when a CEL is triggered, it will light up other warning lights -- there's lots of threads here about this phenomenon. It's the way Subaru does it (and perhaps others).
That said, the P0700 is simply a code that indicates the transmission control module has detected a problem, and has signalled the engine control module to turn on the CEL. From the FSM, for P1843:
DTC P1843 TRANSMISSION FLUID PRESSURE SENSOR SWITCH D CIRCUIT
DTC DETECTING CONDITION:
Direct clutch oil pressure switch malfunction.
TROUBLE SYMPTOM:
Excessive shift shock
NOTE:
Refer to DTC P0766 for diagnostic procedure. <Ref. to 5AT(diag)-71, DTC P0766 SHIFT SOLENOID “D”
PERFORMANCE OR STUCK OFF, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
Basically, what this is saying is that the TCM had commanded a particular action by the direct clutch solenoid (control oil pressure for the direct clutch), but the related pressure sensor (monitors to make sure the desired oil pressure is reached) didn't confirm the action.
In many cases, when a fault code is recorded, even after the fault has been corrected or disappeared and the related warning lights go out, the code will remain in memory, in some cases up to 40 full drive cycles.
It could have been just a single, never-to-be repeated glitch. It happens.
That said, the P0700 is simply a code that indicates the transmission control module has detected a problem, and has signalled the engine control module to turn on the CEL. From the FSM, for P1843:
DTC P1843 TRANSMISSION FLUID PRESSURE SENSOR SWITCH D CIRCUIT
DTC DETECTING CONDITION:
Direct clutch oil pressure switch malfunction.
TROUBLE SYMPTOM:
Excessive shift shock
NOTE:
Refer to DTC P0766 for diagnostic procedure. <Ref. to 5AT(diag)-71, DTC P0766 SHIFT SOLENOID “D”
PERFORMANCE OR STUCK OFF, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
Basically, what this is saying is that the TCM had commanded a particular action by the direct clutch solenoid (control oil pressure for the direct clutch), but the related pressure sensor (monitors to make sure the desired oil pressure is reached) didn't confirm the action.
In many cases, when a fault code is recorded, even after the fault has been corrected or disappeared and the related warning lights go out, the code will remain in memory, in some cases up to 40 full drive cycles.
It could have been just a single, never-to-be repeated glitch. It happens.
