P0715 on 2013-2014 Audi S5: Input Speed Sensor 'A' Circuit Failure Causes and Fixes

What's Unique About the 2013-2014 Audi S5

The 2013-2014 S5 uses the 7-speed S-Tronic DL501 (also known as 0B5) dual-clutch transmission. This gearbox is notorious for issues with its Mechatronics unit, the complex electro-hydraulic control center. The input speed sensors (G182 and others) are not standalone, replaceable parts but are integrated directly onto a printed circuit board (PCB) within this unit. This PCB is a common failure point due to heat, vibration, and potential delamination, making P0715 a frequent and well-documented complaint for this specific transmission.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Generation note: The 2013-2014 Audi S5 is part of the B8.5 generation (a facelift of the B8). This issue is common across the entire B8/B8.5 platform (approx. 2009-2017) and C7 platform (approx. 2012-2018) in vehicles equipped with the DL501 7-speed S-Tronic transmission, including the S4, S5, S6, S7, A4, A5, A6, A7 and Q5.

Symptoms You May Notice

• "Gearbox malfunction: you can continue driving" message on the dashboard.
• PRNDS indicator flashing.
• Vehicle enters "limp mode," often getting stuck in a single gear.
• Harsh, jerky, or delayed gear shifts, especially 2-1 downshifts.
• Clunking noises during shifting.
• Vehicle may not move or have delayed engagement from Park.
• EPC (Electronic Power Control) light may illuminate.
• Loss of reverse gear.

Most Likely Causes

1. Failed Mechatronics Internal Circuit Board / Sensor Module 🔴 High Probability This is a well-documented design flaw and the most common failure point for the DL501 transmission. The circuit boards and integrated sensors are susceptible to failure from heat, vibration, and sometimes delamination of the plastic circuit plates over time. This is the specific issue addressed by Audi's TSB.
   How to confirm: Use an Audi-specific scan tool (like VCDS) to check for fault code P0715 and monitor live data from the Transmission Input Speed Sensor (G182). A reading of zero, an erratic signal, or one that doesn't correspond to engine RPM while the engine is running confirms the fault. The presence of related codes like P171F, P2765, or P0716 further points to the internal board.
   Typical fix: Replace the internal Mechatronics circuit boards and sensors using a dedicated repair kit (e.g., OEM P/N 0B5398048D). 🎬 Watch: Step-by-step guide to installing the circuit board repair kit. This involves removing the transmission pan and the Mechatronics unit to access the boards. A fluid drain/refill and a basic settings adaptation procedure with a diagnostic tool are required after installation.
   Est. part cost: $400-$800
2. Damaged Wiring or Connectors ⚪ Low Probability The internal wiring harness is replaced as part of the repair kit. The main external connector is robust but can be damaged during other service work or by road debris. However, this is far less common than the internal board failure.
   How to confirm: Visually inspect the main round transmission harness connector for corrosion, pushed-out pins, or damage. Test for continuity on the wires leading to the TCM. This is difficult without specific wiring diagrams and is best left to a professional after ruling out the primary cause.
   Typical fix: Repair the damaged section of the wiring harness or replace the connector. If internal, the harness is replaced with the Mechatronics repair kit.
   Est. part cost: $50-$500
3. Failed Transmission Control Module (TCU) ⚪ Low Probability The TCU is integrated into the Mechatronics unit. While it can fail, the sensor circuit boards are a much more common point of failure. A TCU failure often presents with additional communication-related fault codes (like P060A) or a complete inability to communicate with the scan tool.
   How to confirm: This is a diagnosis of exclusion. If the sensor boards and wiring are confirmed to be good, the TCU itself is the likely culprit. This requires advanced diagnostics and is often confirmed when a repair kit fails to solve the issue.
   Typical fix: Replace the entire Mechatronics unit, as the TCU is not typically serviced separately. This is very expensive and requires dealer-level programming and component protection removal.
   Est. part cost: $2000-$4500

Diagnosis Steps

1. Scan the Transmission Control Module (TCM, Address 02) with an Audi-specific diagnostic tool (VCDS, ODIS) to confirm P0715 and note any other stored codes, paying close attention to the DFCC codes.
2. Check the live data stream for Transmission Input Speed Sensor 'A' (G182). The reading should closely correspond to engine RPM when the clutch is engaged and the vehicle is in gear.
3. If the G182 sensor reading is 0 RPM, intermittent, or nonsensical while the engine is running, the sensor circuit is confirmed to be faulty.
4. Inspect the main external transmission wiring harness and the large, round connector for any visible signs of damage, corrosion, or fluid intrusion.
5. If the external wiring is intact, the fault is internal to the transmission, as is the case in over 95% of these failures.
6. The definitive repair is to drain the transmission fluid, remove the pan, and remove the Mechatronics unit to replace the internal sensor circuit boards using the appropriate repair kit.
7. After reinstallation, perform a transmission fluid refill and run the Basic Settings/Adaptation procedure 🎬 Watch: How to perform the scan tool calibration and repair. using a capable scan tool.

Parts You'll Likely Need

• Mechatronics Repair Kit (OEM #0B5398048D (or older revisions like 0B5398048C)) — This is the definitive fix. The input speed sensor (G182) is integrated into one of the two circuit boards in this kit, which are the known failure points for P0715 on the DL501 transmission.
  Trusted brands: Audi Genuine, BorgWarner (OEM manufacturer)
  OEM price range: $400-$700
  Aftermarket price range: $350-$600
• S-Tronic Transmission Fluid (DSG Fluid) (OEM #G052529A2) — The transmission fluid must be drained to service the Mechatronics unit and must be replaced with new, correct-specification fluid. Approximately 6.7-7 liters are needed for a drain and refill. Using non-approved fluid can cause further damage.
  Trusted brands: Audi Genuine, Liqui Moly 8100, Pentosin FFL-2, Motul
  OEM price range: $25-$35 per liter
  Aftermarket price range: $18-$28 per liter
• Transmission Pan Gasket (OEM #0B5321371E) — The pan gasket is a single-use item and must be replaced anytime the transmission pan is removed for service to prevent leaks.
  Trusted brands: Audi Genuine, Elring, Victor Reinz
  OEM price range: $40-$60
  Aftermarket price range: $20-$40
• Transmission Filter (Internal) (OEM #0B5325429E) — This filter is located behind the Mechatronics unit and should be replaced while the unit is out. It is critical for fluid cleanliness.
  Trusted brands: Audi Genuine, Vaico
  OEM price range: $30-$50
  Aftermarket price range: $20-$40

Related Codes That Often Appear With This One

• P171F — Relates to Transmission Input Speed Sensor 2 (G182's counterpart), which is located on the same faulty circuit board.
• P2765 — Relates to Input/Turbine Speed Sensor 'B' Circuit, also located on the Mechatronics circuit board.
• P0716 — Indicates a range/performance issue with the same input speed sensor 'A', often preceding or accompanying a complete circuit failure.
• P179F — Relates to a 'Drive Position Sensor Malfunction'. This sensor is also part of the same internal Mechatronics assembly, and this code frequently appears alongside the speed sensor faults.

Technical Service Bulletins (TSBs) & Recalls

• A351619 2032211- (and revisions like /4): This is the key document from Audi. It explicitly groups DTC P0715 ('Input turbine/speed sensor ‘A’ circuit') with a list of other sensor faults. If these codes are present (with specific DFCC codes), the official repair is to replace the internal sensor module with the repair kit.

Platform-Specific Known Issues

• A Technical Service Bulletin (TSB #A351619 2032211- and its revisions) was issued by Audi acknowledging that P0715, along with a cluster of other codes, points to a failure of the Mechatronics unit's internal printed circuit boards. This TSB confirms the common cause is an internal hardware failure, not an external sensor or wiring issue.

Mechanic-Grade Diagnostic Values

• Transmission Fluid Temperature for Basic Settings — expected: 40°C to 60°C (104°F to 140°F). Failure: Adaptation procedures may fail or not run if the fluid is too hot or too cold.
• Input Speed Sensor (G182) Signal Voltage — expected: A steady sine wave pattern of ~1-2V AC when the engine is running.. Failure: Voltage dropping below 0.5V or an erratic, inconsistent signal points to a failing sensor.
• Wiring continuity between sensor and TCM — expected: Less than 1.5 Ω. Failure: A resistance value higher than 1.5 Ω indicates an open circuit or excessive resistance in the wiring harness.

Hidden / Shadow Codes Worth Checking

• DFCC 8094, 8103, 18161: These are Audi-specific Diagnostic Fault Code Counter (DFCC) numbers that are logged alongside the generic P0715 code. They provide more specific information to dealer technicians, confirming the fault lies within the 'Input turbine/speed sensor 'A' circuit'. Seeing these codes strongly reinforces the diagnosis of an internal mechatronics failure. (see via An Audi-specific scan tool like VCDS or ODIS is required to view these sub-codes.)

Scan Tool Commands That Help

• VCDS or ODIS: Basic Settings - Group 04 — This is mandatory after replacing the mechatronics repair kit. It performs calibrations for the clutch valves and distance sensors. The procedure must be done in a specific sequence.
• VCDS or ODIS: Erase counter for start and stop processes — This is the first step in the basic settings procedure, performed with the engine off.
• VCDS or ODIS: Clutch valve calibration — The second step in the basic settings procedure, performed with the engine running in Park.
• VCDS or ODIS: Distance sensor calibration — The third step, also with the engine running. You will hear the transmission making clunking noises as the selectors adapt.
• VCDS or ODIS: Clutch engagement point adaptation — A final adaptation step performed after the initial basic settings to fine-tune the clutch engagement points.

Wiring & Ground Locations

• Main Transmission Connector (16-pin) — On the driver's side of the transmission housing. It is a large, round, black connector.. This is the main electrical interface between the car's wiring harness and the internal Mechatronics unit. While rarely the cause, damage or corrosion here could mimic an internal fault. The part number for the plug/harness side is 420973716.

Real Owner Repair Stories

• AliExpress User Review (Audi with DL501/0B5 Transmission) — Intermittent limp mode (no power above 3rd gear), 'Gearbox Malfunction' light on the dashboard.
  ❌ Tried (didn't work) A mechanic suggested replacing the entire mechatronic unit for $2,200.
  ✅ What actually fixed it The user diagnosed the fault to the G182 sensor using VCDS-compatible software. Instead of replacing the whole mechatronics, they replaced only the faulty sensor module (which is part of the repair kit), which resolved all symptoms.

OEM Part Supersession History

• 0B5398048C → 0B5398048D — The 'D' revision is an updated version of the repair kit, likely with improvements to address the known failure modes of the circuit boards and sensors.
  Heads up: The newer 0B5398048D kit is the correct and recommended replacement for the older 'C' version and is fully compatible.
• Various (e.g., 0B5398009A/B/C/E/F) → 0B5398048D — The 0B5398048D kit consolidates several previous repair kits and part numbers into one comprehensive package that includes the circuit boards, solenoids, and hardware.
  Heads up: While older part numbers exist, 0B5398048D is the current, all-encompassing repair kit for this issue.