17125 on Audi: How to Diagnose & Fix
Torque Converter Clutch Circuit: Performance or Stuck Off
1 Audi model · 1 documented issue · 1 critical · $900-$5,500 repair
17125 on Audi by model: symptoms, diagnosis and fix
Multiple D3-generation A8 owners report shuddering, slipping, delayed engagement, and harsh shifting traced to the ZF 6HP26 automatic transmission, especially the torque converter lock-up clutch. The problem often begins as a light vibration at steady cruise or a flare on 3-4/4-5 shifts, then progresses to fault codes and limp mode. Audi/ZF service literature and independent repair databases document valve body wear and torque converter clutch deterioration as recurring causes.
Common Symptoms
- Shudder at light throttle around 35-55 mph
- Delayed drive or reverse engagement
- Harsh or flaring shifts
- Transmission warning message
- Limp mode
- Vibration during torque converter lockup
How to Fix
Diagnosis typically includes scanning the transmission control module for ratio and converter clutch faults, checking fluid condition, and measuring slip values during road testing. Repairs range from fluid/filter service and valve body work to torque converter replacement or full transmission rebuild if clutch debris has contaminated the unit. Using the correct ZF Lifeguard fluid and adapting the transmission after repair is commonly recommended.
Sources for this issue (2)
17125 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does 17125 mean on a Audi?
17125 stands for "Torque Converter Clutch Circuit: Performance or Stuck Off." VAG fault code 17125 is the manufacturer equivalent of the generic OBD-II code P0741. It indicates the transmission/engine control module has detected that the torque converter clutch (TCC) is not engaging properly or is stuck off, meaning lock-up is not occurring as commanded. It is typically set when the slip difference between engine speed and transmission input/turbine speed exceeds the expected threshold during commanded lock-up. On Audi it is documented across 1 model: A8.
What are the most common causes of 17125?
The most common causes of 17125 are: Failed or worn torque converter / TCC lock-up clutch (internal mechanical wear), Faulty torque converter clutch solenoid or valve body issue, Low or degraded/contaminated automatic transmission fluid, Stuck or sticking TCC control valve in the valve body, Wiring or connector faults in the TCC solenoid circuit, Internal transmission failure or worn clutch/seals affecting lock-up. The specific cause varies by vehicle.
How much does it cost to fix 17125 on a Audi?
Published repair estimates on Audi range from $900 to $5,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for 17125 on a different make?
View 17125 across all makes →Join 600+ people using Au7o to better understand their vehicles.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.