DTC P0842: Transmission Fluid Pressure Sensor/Switch "A" Circuit Low

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information - Refer to: How to Troubleshoot the Fuel and Emissions SystemsHow to Troubleshoot the CVT System(CVT System) .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

• 1. Problem verification:

  1. Turn the vehicle to the ON mode.

  2. Clear the DTC with the HDS.

  3. Check the parameter(s) below with the HDS.

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Driven Pulley Pressure Sensor(V)	Less than 0.21	V

  Do the current condition(s) match the threshold?

  YES 

  The failure is duplicated. Go to step 2.

  NO 

  Intermittent failure, the system is OK at this time. Check for an intermittent short to ground in the PDN wire between the CVT driven pulley pressure sensor and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

• 2. Determine possible failure area (PDN line, others):

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Disconnect the following connector.

  CVT driven pulley pressure sensor 3P connector

  3. Turn the vehicle to the ON mode.

  4. Check the parameter(s) below with the HDS.

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Driven Pulley Pressure Sensor(V)	Less than 0.21	V

  Do the current condition(s) match the threshold?

  YES 

  Go to step 3.

  NO 

  Go to step 4.

• 3. Shorted wire check (PDN line):

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Jump the SCS line with the HDS, and wait more than 1 minute.

  3. Disconnect the following connector.

  PCM connector C (51P)

  4. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	CVT driven pulley pressure sensor 3P connector: disconnected
  	PCM connector C (51P): disconnected
  Test point 1	CVT driven pulley pressure sensor 3P connector No. 2
  Test point 2	Body ground

  Courtesy of HONDA, U.S.A., INC.

  Is there continuity?

  YES 

  Repair a short to body ground in the PDN wire between the CVT driven pulley pressure sensor and the PCM.

  NO 

  The PDN wire is OK. Update the PCM if it does not have the latest software , or substitute a known-good PCM , then recheck. If DTC P0842 goes away and the PCM was updated, troubleshooting is complete. If DTC P0842 goes away and the PCM was substituted, replace the original PCM .

• 4. Open wire check (VCC2 line):

  1. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode
  	CVT driven pulley pressure sensor 3P connector: disconnected
  Test point 1	CVT driven pulley pressure sensor 3P connector No. 3
  Test point 2	Body ground

  Courtesy of HONDA, U.S.A., INC.

  Is there about 5 V?

  YES 

  The VCC2 wire is OK. Replace the CVT driven pulley pressure sensor .

  NO 

  Repair an open in the VCC2 wire between the CVT driven pulley pressure sensor and the PCM.