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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - 4L60-E >> Diagnostic Tests >> DTC P0742: TCC System - Stuck On >> Diagnostic Procedure

Diagnostic Procedure

  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to DLC. Turn ignition on, engine off. Using scan tool, record freeze frame and failure records for reference, and then clear DTCs. Test drive vehicle in "D4" range under steady acceleration, with TP sensor angle greater than 20 percent. Monitor TCC slip speed on scan tool. If TCC slip speed is -20 to 50 RPM while TCC enable status is NO, go to next step. If slip speed is not as specified, see DIAGNOSTIC AIDS .
  3. TCC is hydraulically stuck on. Check for clogged exhaust orifice in TCC solenoid valve, converter clutch apply valve stuck in apply position, misaligned or damaged valve body gasket, restricted release passage or restricted transmission cooler line. Repair as necessary. After repairs, go to next step.
  4. Using scan tool, clear DTCs. Test drive vehicle in "D4" and hold throttle angle at greater than 17 percent. Ensure TCC slip speed is 100-2000 RPM for 4 seconds with TCC off. Check for DTCs. If DTC P0742 does not return, system is okay. If DTC P0742 returns, go to step  1.
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