DTC P0847

DTC P0847  : Transmission Fluid Pressure Switch B (3rd Clutch) Circuit Low

NOTE: Before you troubleshoot, review the General Troubleshooting Information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015) .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
• If DTC P0847 is stored in the PCM, the transmission does not shift to any gear other than 3rd or 6th gear because of the fail-safe function.

DTC (A/T)

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
   3rd Pressure Switch	ON

   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 poor connections and loose terminals between transmission fluid pressure switch B (3rd clutch) 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 (transmission fluid pressure switch B (3rd clutch), others)

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

   - 2. Disconnect the following connector.

   Transmission fluid pressure switch B (3rd clutch) 1P 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
   3rd Pressure Switch	OFF

   Do the current condition(s) match the threshold?

   YES 

   Replace transmission fluid pressure switch B (3rd clutch) .

   NO 

   Go to step 3.

3. Shorted wire check (OP3SW line)

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

   - 2. Jump the SCS line with the HDS.

   - 3. Disconnect the following connector.

   PCM connector B (51P) - Refer to: How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Fuel and Emissions Systems,

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

   Test condition	Vehicle OFF (LOCK) mode
   	Transmission fluid pressure switch B (3rd clutch) 1P connector: disconnected
   	PCM connector B (51P): disconnected
   Test circuit	OP3SW
   Test point 1	PCM connector B (51P) No. 25 (LT BLU)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short to ground in the OP3SW wire between transmission fluid pressure switch B (3rd clutch) and the PCM.

   NO 

   The OP3SW wire is OK. Replace the PCM - Refer to: PCM Removal and Installation (2014 2015), .