DTC Troubleshooting: P0848 (26-4)

DTC P0848: Open in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck OFF NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot. This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission. Clear the DTC with the HDS. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on). Drive the vehicle in the 3rd gear in the M position, and verify that the SHIFT MAP NUMBER indicates 3rd with the HDS in the A/T data list. Check the 3rd PRES SWITCH signal with the HDS in the A/T data list. Is the 3rd PRES SWITCH ON?
YES | - | Go to Step 4 .
NO | - | Go to Step 6 .
Drive the vehicle in 3rd gear in the M position for more than 5 seconds, then upshift to 4th gear, and drive in 4th gear for more than 5 seconds. Slow down to a stop. Monitor the OBD status for P0848 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail. Does the result indicate a fail?
YES | - | Go to Step 6 .
NO | - | Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the 3rd clutch transmission fluid pressure switch and PCM. If the tester indicates NOT COMPLETE, return to Step 4 and recheck.■
Turn the ignition switch OFF. Disconnect the 3rd clutch transmission fluid pressure switch connector. Turn the ignition switch ON (II). Measure the voltage between the 3rd clutch transmission fluid pressure switch connector terminal and body ground. Is there about 5 V?
YES | - | Replace the 3rd clutch transmission fluid pressure switch, then go to Step 11 .
NO | - | Go to Step 10 .

Measure the voltage between PCM connector terminal C10 and body ground. Is there about 5 V?
YES | - | Repair open in the wire between PCM connector terminal C10 and the 3rd clutch transmission fluid pressure switch, then go to Step 11 .
NO | - | Check for loose or poor connections at PCM connector terminal C10. If the connection is OK, update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM .■
Clear the DTC with the HDS. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on). Drive the vehicle in 3rd gear in the M position for more than 5 seconds, then upshift to 4th gear, and drive in 4th gear for more than 5 seconds. Slow down to a stop. Monitor the OBD status for P0848 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail. Does the result indicate a pass?
YES | - | The problem has been corrected.■
NO | - | Return to Step 1 and recheck.■