Symptoms:

  • Code 894, 1870
  • No lockup
  • TCC slip
  • No Reverse
  • Overheated converter
  • Harsh TCC apply

Cause:

Wear at the TCC regulator valve bore reduces apply pressure or TCC solenoid is damaged from valve contact.

Correction:

This kit includes a wear-resistant sleeve, modified valve and spring to re-establish proper apply pressure to the torque converter clutch, and prevents damage to the TCC PWM solenoid.

5L40-E, 5L50-E

TCC Regulator Valve Kit
Part No. 55211-04K


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When the TCC PWM solenoid is energized and TCC signal fluid pressure is present, it strokes the TCC regulator valve and regulates line pressure into the converter clutch apply passage. Due to the pulse width modulation of the solenoid, the regulator valve is continuously oscillating. Excessive wear at the large spool diameter can prevent proper valve movement, causing no TCC, slips or soft apply. Excessive wear at the balance end of the bore can lead to harsh apply. Additionally, the OE valve stops against the TCC PWM solenoid screen, resulting in damage or breakage. Debris from the broken screen can lodge at the reverse lockout valve, resulting in no reverse. The Sonnax TCC regulator valve and sleeve kit includes a highly wear-resistant sleeve, modified valve and spring to restore proper converter clutch apply pressure. A solenoid protector is also included to eliminate damage to the solenoid screen. The valve bore must be reamed to accommodate the sleeve.

  • Highly wear resistant sleeve provides significantly more valve support to reduce leakage and prevent wear.
  • Anodized aluminum valve resists wear to prevent leakage.
  • Modified replacement spring restores proper pressure with the undersized valve.
  • Solenoid protector eliminates solenoid screen damage.
  • Sleeve
  • Valve
  • Retaining Clips (2)
  • Spring
  • Solenoid Protector

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

GM 5L40-E, 5L50-E Valve Body Layout

GM 5L40-E, 5L50-E Valve Body Layout
  • 5L40-E, 5L50-E TCC Regulator Valve Kit 55211-04K
  • 5L40-E, 5L50-E TCC Regulator Valve Kit 55211-04K