I HAVE A 2000 JEEP GRAND CHEROKEE 4X4 WITH THE 4

  • Tiny
  • Anonymous
  • 2000 Jeep Grand Cherokee
  • 174,000 miles

I have a 2000 jeep grand cherokee 4x4 with the 4.7 v8. I started my vehicle up and drove away the transmission started slipping and the check engine light came on and I took it to autozone and the put it on the computer and it threw a P1728 code what could it be

Saturday, December 15th, 2012 AT 9:18 PM

1 Reply

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

Symptom:
P1728-2C HYDRAULIC PRESSURE TEST FAILURE

When Monitored and Set Condition:
P1728-2C HYDRAULIC PRESSURE TEST FAILURE

When Monitored: In any forward gear with engine speed above 1000 RPM shortly after a shift and every minute thereafter.

Set Condition: After a shift into a forward gear, with engine speed >1000 RPM, the TCM momentarily turns on element pressure to the clutch ckts that don't have pressure to identify the correct pressure sw closes. If the pressure sw does not close 2 times, the code sets

Possible Causes:
INCORRECT FLUID LEVEL
EXCESSIVE DEBRIS IN OIL PAN
INTERMITTENT WIRING & CONNECTORS
RELATED PRESSURE SWITCH AND/OR SPEED RATIO DTC'S PRESENT
2C PRESSURE SWITCH SENSE CIRCUIT OPEN
2C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
5-VOLT SUPPLY CIRCUIT OPEN
POOR LPS CONNECTION
RELATED LINE PRESSURE DTC'S PRESENT
2C PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
5-VOLT SUPPLY CIRCUIT SHORT TO GROUND
TRANSMISSION RELAY OUTPUT CIRCUIT OPEN
INTERNAL TRANSMISSION PROBLEM - PRESSURE TEST
LINE PRESSURE SENSOR
TCM (2C PRESSURE SWITCH)
TCM (NO 5 VOLTS LOW LINE PRESSURE SENSOR)

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Saturday, December 15th, 2012 AT 9:26 PM

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