4L80E TCC Solenoid: P0741 Diagnosis & Replacement

A failed 4L80E TCC solenoid kills lockup, kills your MPG, and throws P0741. Fix is straightforward if you catch it early.

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Symptoms

  • P0741 TCC stuck off (most common)
  • P0740 TCC circuit
  • Higher highway RPM at cruise
  • MPG drop 2-4 MPG
  • No converter lockup feel
  • Sometimes erratic torque converter shudder

How the TCC solenoid works

  • PWM-controlled by the PCM
  • Routes pressure to the TCC apply circuit
  • Coil resistance spec: 20-30 ohms
  • Wear part - typically fails between 100k-180k miles

Diagnosis

Step 1: Pull DTCs

  • P0741 confirms TCC stuck off
  • P0742 confirms TCC stuck on (different problem)

Step 2: Check fluid

  • Burnt fluid = converter clutch worn, not solenoid
  • Clean fluid + P0741 = solenoid first suspect

Step 3: Resistance test

  • Drop pan
  • Disconnect solenoid wiring
  • Ohm across terminals: 20-30 = good, infinite = open coil

Step 4: Check ground / PCM

  • Backprobe ground wire with key on
  • Should toggle when PCM commands lockup
  • Bad ground = wiring, not solenoid

Replacement parts

Solenoid:

  • AC Delco 24202375 (OEM)
  • TransGo TCC-A (HD aftermarket)
  • $25-$60 part

Always replace together:

  • Pan gasket
  • Filter
  • 7+ quarts Dexron VI

Install

  • Drain pan, drop pan
  • Disconnect solenoid wiring connector
  • Remove 2 valve body bolts holding TCC solenoid bracket
  • Pull solenoid, insert new with new O-ring
  • Reverse for reinstall
  • Torque pan bolts in spec sequence (97 in-lb)

Total time and cost

DIY:

  • Time: 2-3 hours
  • Parts: $80-$150 (solenoid, gasket, filter, fluid)
  • Code reset after install

Shop:

  • Labor: $250-$450
  • Parts: $80-$150
  • Total: $330-$600

When solenoid is not the fix

If P0741 returns after a new solenoid, the problem is upstream:

  • TCC apply piston / clutch worn
  • Valve body wear (TCC regulator stuck)
  • PCM ground or driver fault

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