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P0742 Diagnostic and Fix for 2010 Chevrolet Suburban: TCC Issues and Shifting Problems

Model: 2010 Chevy Suburban Fault Code: P0742 Posted: 2018-03-15 14:38

I own a 2010 Chevrolet Suburban and am currently experiencing a P0742 diagnostic trouble code. The vehicle fails to shift into second gear in automatic mode, behaving as if it's stuck in neutral. Manual shifting works properly, but the engine runs at unusually high RPMs during operation. I've read that a faulty Torque Converter Clutch (TCC) may be causing this issue, but I'm unable to locate a replacement TCC solenoid part for my 6L80 transmission model. I'd like to resolve this without having to replace the entire transmission. Can anyone confirm whether a TCC is present in the 6L80 transmission and provide guidance on how to verify or test it before investing in a full transmission overhaul?

Related fault codes

P0742

Comments (3)

Anonymous 2018-03-15 16:01

To accurately diagnose the issue, perform voltage and resistance tests using a multimeter. Refer to BBBind.com for detailed transmission wiring schematics. Common causes of P0742 include: damaged or pinched wiring harness connections between the transmission and vehicle, failure of the TCC solenoid, or malfunctioning Transmission Control Module (TCM). For more details, see official P0742 code explanations.

Anonymous 2018-03-15 16:11

Does a 6L80 transmission in a 2010 Chevrolet Suburban include a Torque Converter Clutch (TCC)? Based on available documentation, the 6L80 should have a TCC. However, I'd like to confirm this with verified sources before purchasing any parts. I want to avoid spending money on a full transmission replacement if it's not necessary.

Anonymous 2018-03-15 19:56

If you're unable to perform DIY testing yourself, a qualified transmission specialist can conduct diagnostic tests on the transmission components and determine whether a complete transmission replacement is required or if a simpler repair—like replacing the TCC solenoid—is sufficient.