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DTC Troubleshooting: P0842 (25)

DTC P0842:
 2nd Clutch Transmission Fluid Pressure Switch (Short or Stuck ON)
NOTE:
  1. Clear the DTC with the HDS.
  1. Check the 2nd Pressure Switch signal with the HDS in the A/T data list when not in 2nd gear.
Is the 2nd Pressure Switch OFF?
YES -
Go to Step 3 .
NO -
Go to Step 6 .
  1. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
  1. Test-drive the vehicle:
    • Seven-position transmission: Drive the vehicle in 3rd gear in D or D3 for at least 2 seconds, then slow down to a stop.
    • Five-position transmission: Drive the vehicle in 3rd gear in the sequential shift mode in S for at least 2 seconds, or in D, then slow down to a stop.
  1. Monitor the OBD status for P0842 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate FAILED?
YES -
Go to Step 6 .
NO -
Intermittent failure, the system is OK at this time. Check the OP2SW wire for an intermittent short to ground between the 2nd clutch transmission fluid pressure switch and the PCM. If the HDS indicates NOT COMPLETED, return to Step 4 and recheck.
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the 2nd clutch transmission fluid pressure switch connector.
  1. Turn the ignition switch to ON (II).
  1. Check the 2nd Pressure Switch signal with the HDS in the A/T data list.
Is the 2nd Pressure Switch OFF?
YES -
NO -
Go to Step 10 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect PCM connector B (49P).
  1. Check for continuity between PCM connector terminal B8 and body ground.
Is there continuity?
YES -
Repair short in the wire between PCM connector terminal B8 and the 2nd clutch transmission fluid pressure switch, then go to Step 20 .
NO -
Go to Step 14 .
  1. Reconnect all connectors.
  1. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
  1. Test-drive the vehicle:
    • Seven-position transmission: Drive the vehicle in 2nd gear in D for at least 2 seconds, then press the accelerator pedal so that the transmission upshifts into 4th gear, and drive in 4th gear for at least 2 seconds. Slow down and stop the wheels.
    • Five-position transmission: Drive the vehicle in 2nd gear in the sequential shift mode in S for at least 2 seconds, then upshift to 4th gear by pulling the paddle shifter + (upshift switch), and drive in 4th gear for at least 2 seconds. Slow down and stop the wheels.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0842 indicated?
YES -
If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to Step 1 .
NO -
Go to Step 19 .
  1. Monitor the OBD status for P0842 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate PASSED?
YES -
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other DTCs were indicated on Step 18 , go to the indicated DTC's troubleshooting.■
NO -
Check for an intermittent short in the wire between the 2nd clutch transmission fluid pressure switch and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to Step 1 . If the HDS indicates NOT COMPLETED, return to Step 17 and recheck.
  1. Reconnect all connectors.
  1. Clear the DTC with the HDS.
  1. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
  1. Test-drive the vehicle:
    • Seven-position transmission: Drive the vehicle in 2nd gear in D for at least 2 seconds, then press the accelerator pedal so that the transmission upshifts into 4th gear, and drive in 4th gear for at least 2 seconds. Slow down and stop the wheels.
    • Five-position transmission: Drive the vehicle in 2nd gear in the sequential shift mode in S for at least 2 seconds, then upshift to 4th gear by pulling the paddle shifter + (upshift switch), and drive in 4th gear for at least 2 seconds. Slow down and stop the wheels.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0842 indicated?
YES -
Check for an intermittent short in the wire between the 2nd clutch transmission fluid pressure switch and the PCM, then go to Step 1 .
NO -
Go to Step 25 .
  1. Monitor the OBD status for P0842 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other DTCs were indicated on Step 24 , go to the indicated DTC's troubleshooting.■
NO -
Check for an intermittent short in the wire between the 2nd clutch transmission fluid pressure switch and the PCM, then go to Step 1 . If the HDS indicates NOT COMPLETED, return to Step 23 and recheck.