Introduction
The Audi 0B5 DL501 S-Tronic gearbox (7-speed dual-clutch, also known as the DL501 DSG) is fitted to a wide range of Audi models including the A4, A5, A6, A7, Q5, S4, and RS5.
One of the more common failures seen in these gearboxes is with the G676 input speed sensor. Unlike some sensors integrated into the mechatronic, the G676 is housed in the rear section of the transmission and uses two inductor wheels to read the input shaft speeds.
This information is crucial for the TCU (transmission control unit) to correctly control clutch engagement, gear changes, and torque distribution. If the sensor fails or gives implausible signals, the gearbox cannot operate reliably, often forcing the car into limp mode or triggering fault codes.
Fault Codes Linked
to G676 Sensor Failure
When the G676 sensor fails, you may see one or more of the following DTCs logged:
- P0501 — Vehicle speed sensor “A” range/performance
- P060A — Internal control module monitoring processor performance
- P0700 — Transmission control system malfunction
- P0715 — Input turbine/speed sensor “A” circuit
- P0716 — Input turbine/speed sensor “A” circuit range/performance
- P171F — Transmission input speed (RPM) sensor 2 implausible signa
- P1758 — Terminal 15 voltage supply open circuit
- P179E — Drive position sensor electrical error
- P179F — Drive position sensor malfunction
- P2159 — Vehicle speed sensor “B” range/performance
- P2765 — Input turbine/speed sensor “B” circuit
The key identifiers of G676 failure are P179E, P179F, P0715, P0716, and P171F, which all relate directly to shaft speed detection problems.
🚨 Quick Symptoms of
G676 Input Speed Sensor Failure
When the G676 sensor stops reporting accurate shaft speeds, symptoms typically include:
- “Gearbox Malfunction” warning on the dashboard
- The vehicle entering limp mode, often restricting available gears
- Erratic or harsh gear changes, especially under load
- Failure to engage drive or reverse correctly
- Delayed response when accelerating from a standstill
Q: What are the signs of G676 failure?
A: Drivers usually see a gearbox malfunction warning, experience limp mode, or notice harsh/delayed shifts. Some cars may refuse to select drive or reverse.
Why this repair
requires specialists
The G676 sensor is located in the rear casing of the DL501 gearbox, not in the mechatronic. Access requires significant dismantling of the transmission and careful reassembly to ensure correct sensor alignment with the inductor wheels.
At Eco Torque, we:
- Removal and full strip down of the gearbox to access the sensor
- Replace the G676 input speed sensor with OE-quality components
- Inspect the inductor wheels for wear or damage
- Refit the gearbox and complete basic settings and adaptations to restore correct clutch and gear synchronisation
This is a labour-intensive repair requiring specialist tools — one best left to gearbox specialists.
Eco Torque Repair Solutions
- ✅ G676 input speed sensor replacement with OE-quality parts
- ✅ Full rear section dismantle and inspection
- ✅ Inductor wheel check and cleaning
- ✅ Basic settings and clutch adaptations completed post-repair
- ✅ Optional clutch and DMF inspection while transmission is out
❓ Frequently Asked Questions (FAQ)
Q: What does the G676 sensor do?
A: It measures the input speeds of both gearbox shafts using two inductor wheels. This data allows the TCU to manage clutch control and smooth gear shifts.
Q: Which Audi models are affected?
A: Any model fitted with the 0B5 DL501 gearbox — including A4, A5, A6, A7, Q5, S4, and RS5.
Q: Why is this repair so involved?
A: The G676 sits in the rear gearbox casing. Access requires dismantling and reassembly with precision — not a job for general garages.
Q: What fault codes point to G676 issues?
A: Codes like P179E, P179F, P0715, P0716, and P171F are strong indicators of sensor failure.
Q: Can dealers replace just the sensor?
A: Dealers often quote for a full gearbox or mechatronic replacement. At Eco Torque, we can replace only the G676, saving significant cost.
💬 Share Your Experience & Get in Touch
Have you had fault codes like P179E, P179F, or P0715 logged on your Audi? Drop a comment below to share your experience - your feedback helps other owners spot issues early.
For bookings or expert gearbox advice, contact us directly:
Eco Torque Ltd
Unit 1A Portland Industrial Estate
Hitchin Road
Arlesey
United Kingdom
SG15 6SG
📞 01462 835335
📧 info@eco-torque.co.uk
