DTC P0872: Short in Transmission Fluid Pressure Switch C (4th Clutch) Circuit, or Transmission Fluid Pressure Switch C (4th Clutch) Stuck ON
WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review the GENERAL TROUBLESHOOTING INFORMATION
- This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
- If DTC P0872 is stored in the PCM, the transmission does not shift to any gear other than 1st or 4th gear because of the fail-safe function.
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS.
- Check the 4th Pressure Switch signal with the HDS in the A/T Data List.
Is the 4th Pressure Switch ON?
YES -Go to step 4.
NO -Intermittent failure, the system is OK at this time.
- Turn the ignition switch to LOCK (0).
- Disconnect the transmission fluid pressure switch C (4th clutch) connector.
- Turn the ignition switch to ON (II).
- Check the 4th Pressure Switch signal with the HDS in the A/T Data List.
Is the 4th Pressure Switch OFF?
YES -Replace transmission fluid pressure switch C (4th clutch) (see TRANSMISSION FLUID PRESSURE SWITCH C (4TH CLUTCH) REPLACEMENT ).
NO -Go to step 8.
- Turn the ignition switch to LOCK (0).
- Jump the SCS line with the HDS.
- Disconnect PCM connector C (49P).
- Check for continuity between PCM connector terminal C37 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short to body ground in the wire between PCM connector terminal C37 and transmission fluid pressure switch C (4th clutch).
NO -Replace the PCM (see PCM REPLACEMENT ).