If you own a Porsche 991 (2012–2019) with Porsche Dynamic Chassis Control (PDCC), you may eventually need to replace the PDCC hydraulic fluid reservoir as part of routine maintenance or after a leak. Knowing the exact part number is crucial to ensure you get the right component. This guide covers the OEM part numbers, where the reservoir is located, and what to consider when purchasing a replacement.
What Is the PDCC Reservoir?
The PDCC system uses active anti-roll bars powered by a hydraulic pump and a fluid reservoir. The reservoir holds the hydraulic fluid that allows the system to adjust roll stiffness in corners. Over time, the reservoir can develop cracks or leaks, or the fluid may become contaminated, requiring replacement. Unlike a simple fluid flush, the reservoir itself must be swapped out if it fails.
Original Porsche 991 PDCC Reservoir Part Number
For the 991 generation (including 991.1 and 991.2), the OEM part number for the PDCC reservoir is 991 347 041 00. This is the genuine Porsche part, which includes the reservoir cap and mounting bracket. Some supersessions may exist, but as of now, this number is the primary reference for the 991 Carrera, Carrera S, 4S, Turbo, Turbo S, GT3 (with PDCC option), and other models equipped with PDCC.
Compatible Models
The 991 347 041 00 reservoir fits all 991 variants with factory PDCC, including:
- 991.1 (2012–2016)
- 991.2 (2017–2019)
- Carrera / Carrera S / 4S
- Turbo / Turbo S
- GT3 / GT3 RS (if equipped)
- Targa 4S / 4 GTS
Always verify compatibility with your VIN or by checking your existing reservoir for the numbers molded into the plastic.
Where Is the PDCC Reservoir Located on a 991?
The reservoir is mounted in the engine bay, on the passenger side (right side in left-hand drive cars), near the firewall, behind the coolant expansion tank. It is a black plastic canister with a yellow cap labeled with PDCC warning symbols. Accessing it may require removing the engine cover and possibly the coolant tank overflow tube. Here’s a quick step-by-step for those looking to replace it themselves:
- Disconnect battery – Always disconnect the negative terminal to avoid electrical issues.
- Remove engine cover – Unclip the cover to expose the reservoir.
- Drain fluid – Using a turkey baster or siphon, remove as much fluid as possible from the reservoir. Note: PDCC fluid is typically Pentosin CHF 11S or equivalent.
- Detach hoses – Note which hose goes to the pump and which is the return. Use clamps to prevent spillage.
- Unbolt the reservoir – It is held by two 10mm bolts. Remove and replace.
- Reconnect hoses and refill with fresh PDCC fluid. Bleed the system according to Porsche service procedures.
If you are not experienced with hydraulic systems, it is advisable to have a Porsche specialist perform the replacement.
Aftermarket Alternatives vs. OEM
Genuine Porsche part 991 347 041 00 typically costs between $180 and $250 USD. Some aftermarket brands offer PDCC reservoirs for 991 models, often labeled as “OE quality” or “OEM equivalent.” While these can save money (around $80–$120), be cautious:
- Material quality: OEM reservoirs use specific plastics designed to withstand hydraulic pressure and temperature. Cheap aftermarket ones may crack sooner.
- Fitment: Aftermarket reservoirs may not have the exact dimensions, causing hose routing issues.
- Cap seal: The cap and vent system must match OEM to prevent fluid leaks or pressure imbalance.
For a critical component like the PDCC reservoir, sticking with genuine Porsche parts is recommended to ensure reliability and proper system operation. If budget is a concern, a used OEM reservoir from a low-mileage salvage car might be an option, but inspect it carefully for cracks.
How to Confirm You Have the Correct Part
Before ordering, check the part number on your current reservoir. It should be molded into the plastic, typically on the side or bottom. If the number matches 991 347 041 00, you’re set. If your car has been modified or has a different OEM configuration, consult a Porsche dealer or an online parts catalog like Pelican Parts or FCP Euro (without mentioning them as marketplaces, just as resources).
Also, verify your VIN via a Porsche parts diagram site to ensure no supersession has changed the part number. Sometimes Porsche updates part numbers due to design improvements. If yours has been updated, the latest part will supersede the old one.
Common Symptoms of a Failing PDCC Reservoir
- Fluid leaks – Puddles under the engine bay or dripping from the reservoir.
- PDCC warning light – The dashboard alerts you to system malfunction.
- Reduced handling – Less active roll control, especially during cornering.
- Low fluid level – If you check the reservoir and it’s consistently low without visible external leaks, there may be an internal crack.
If you notice any of these, inspect the reservoir first. Sometimes the cap or vent can fail, but often the plastic body becomes brittle.
Replacement Cost and Labor
If you DIY, the reservoir itself is around $200, plus fluid (about $30 per liter, with a capacity of ~0.8L). Total DIY cost: $230–$250. At a dealership or independent shop, expect 1.5–2 hours of labor, bringing total cost to $400–$600. Independent Porsche specialists are often cheaper and just as skilled.
Final Recommendation
For Porsche 991 PDCC owners, the official part number 991 347 041 00 is your go-to reference. Stick with genuine OEM for reliability. If your reservoir is leaking or the PDCC system is acting up, replace it promptly—don't wait for a complete failure. Always use the correct hydraulic fluid (Pentosin CHF 11S or equivalent) and bleed the system after replacement. When in doubt, consult a professional. This simple part can keep your 911 handling at its best.