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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 02-19-2010, 11:44 PM   #1
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Default P1860


Torque converter clutch pulse width modulation solenoid

Code type, Electrical

Trans may slip as it holds in 3rd gear
Disable shift adapts
Inhibits TCC
Inhibits 4th gear in hot mode


  • Failure of pressure control solenoid
  • Failure of TCC/PWM solenoid
  • Short in wire harness
  • Loss of 12v on pin E
  • Check for 12v on pin E
  • Check for Ohms on pins C-D, 3-5ohms at 68*f If out of range, replace EPC
  • Check for Ohms on pins T-E, 10-12ohms at 68*f, if out of range replace TCC/PWM solenoid
  • Check for short on wire harness
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