P1860: TCC PWM Solenoid Circuit Electrical OBD-II Trouble Code

The torque converter clutch pulse width modulation solenoid is responsible for helping to engage the torque converter clutch. If it does not work properly, then the torque converter clutch could get stuck, resulting in poor engine performance or engine stalling. Should this happen, a P1860 diagnostic trouble code a will we be stored in the TCM/ECU.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

How Serious is the Code?

The P1860 DTC is a fairly serious OBDII diagnostic trouble code, as it relates to the operation of the torque converter. Should this not work properly, the engine can fail to perform or completely stall out, which can create a serious safety hazard.

Symptoms

Symptoms of a P1860 include:

  • Engine stalling
  • Poor engine performance
  • Failed upshifts/downshifts
  • Slipping
  • Transmission overheating

Causes

  • Faulty TCC PWM solenoid
  • Dirty transmission fluid/filter
  • Blocked hydraulic passage inside the transmission

How to Diagnose the Code?

The condition of the transmission fluid is the first thing that should be considered when diagnosing a P1860 DTC. If the condition of the ATF is good and no metal fragments are present, electrical tests will need to be performed on the torque converter clutch pulse width modulation solenoid.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

What Repairs Will Fix P1860?

  • Service the transmission (i.e. change the transmission fluid and filter)
  • Replace the TCC PWM solenoid

Related Codes

P1866 – TCC PWM Solenoid Circuit Low Voltage