What does 'p177c clutch 2 reaching tolerance limit' mean?

[BentleyRose]

p177c clutch 2 reaching tolerance limit refers to when the clutch establishes working pressure, the piston exceeds its movement limit due to excessive travel distance, indicating clutch wear. Below is relevant information: 1. Clutch: The clutch is located in the flywheel housing between the engine and transmission, with the clutch assembly fixed to the rear plane of the flywheel using screws. The output shaft of the clutch serves as the input shaft of the transmission. During vehicle operation, the driver can depress or release the clutch pedal as needed to temporarily disconnect or gradually engage the engine and transmission, thereby interrupting or transmitting power from the engine to the transmission. 2. Clutch types: Clutches are categorized into four types: electromagnetic clutches, magnetic particle clutches, friction clutches, and hydraulic clutches.

[McSarah]

I've just researched this trouble code, P177C indicates that the clearance of clutch 2 exceeds the manufacturer's specified range. In layman's terms, it means the clutch disc is too worn, creating excessive clearance - just like when shoe soles wear thin after long use. The transmission control module detects abnormal signals and triggers the fault. From my experience, this issue commonly occurs in dual-clutch transmissions, especially in some European vehicles. While initial symptoms may only include jerky shifting or power interruption, continued driving could lead to complete clutch failure. You'll need to visit a professional workshop to confirm actual tolerance values using a diagnostic scanner, while also checking the hydraulic system for leaks since insufficient oil pressure can cause similar faults. For repairs, it may require replacing clutch discs or adjusting clearance shims, depending on the extent of wear.

[Nascimento]

My Volkswagen had this warning light on not long ago, and the 4S shop said it was due to excessive clutch tolerance. Essentially, the second set of clutches in the transmission that control even and odd gears had worn beyond limits. This causes synchronization issues, making the car jerk like a novice driving a manual. When I asked the technician why this happened, he explained that prolonged stop-and-go traffic with partial clutch engagement, launch starts, or aggressive driving can accelerate wear. Nowadays, repairs don't require engine removal - improved friction plates can be replaced through the transmission oil pan. OEM parts plus labor cost about 3,000 yuan. They recommended checking the transmission fluid too; if it's black, replacing it together would be more reliable.

[VanHazel]

The root cause of this issue is excessive mechanical clearance due to worn clutch discs. The transmission control unit monitors clutch position via Hall sensors - when clearance exceeds tolerance, the engagement point becomes inaccurate. Through repair experience, I've identified two common triggering scenarios: 1) prolonged semi-engaged braking during long mountain descents; 2) modified vehicles with increased horsepower but unupgraded clutch systems. The critical solution involves measuring actual clearance values - adjustments with shims may work if under 1.5mm, but exceeding 2mm typically requires full clutch assembly replacement. Note: Always perform clutch adaptation using a diagnostic tool post-replacement, otherwise engagement noise may occur.