C11D1 on Porsche: How to Diagnose & Fix
Rear Axle Steering - Travel Blocked
1 Porsche model · 1 documented issue
C11D1 on Porsche by model: symptoms, diagnosis and fix
Porsche Technical Information 07/25 ENU 4883 applies to the 911 Carrera GTS (992), 911 Carrera 4 GTS (992), 911 Turbo (992) and 911 Turbo S (992) from model year 2025 equipped with rear axle steering (M-no. 0N5). The customer complaint is that "the yellow warning message 'Rear axle steering failed' in the instrument cluster lights up in conjunction with dynamic cornering." The rear axle steering control unit stores C1445F2 (malfunction of right servo motor, 000015) and C11D1F5 (travel blocked, 000028). Despite naming the right servo motor and a blocked-travel condition, Porsche's remedy is a control unit re-programming, which indicates the codes are a software artifact rather than a mechanically seized actuator. Rear axle steering is optional on the GTS cars and standard on Turbo models, so this is fitment-gated - a 992 without M-no. 0N5 cannot exhibit it.
Common Symptoms
- Yellow "Rear axle steering failed" message during hard or dynamic cornering
- Rear axle steering disabled, with a noticeably larger low-speed turning circle
- Warning appears intermittently and may clear on restart
How to Fix
Re-program the rear axle steering control unit using the PIWIS Tester. The minimum programming requirement is PIWIS Tester software release 43.200.031 or higher, and the resulting control unit software release is 0801 or higher. Programming uses the "Automatic programming" function in the rear axle steering control unit's Coding/programming menu and takes up to five minutes; the unit is re-coded automatically afterwards. Do not replace the right rear steering servo motor on the strength of C1445F2 alone until the software update has been applied and the fault memories cleared.
Sources for this issue (1)
C11D1 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 C11D1 mean on a Porsche?
C11D1 stands for "Rear Axle Steering - Travel Blocked." The rear axle steering control unit has determined that a rear-wheel steering actuator could not reach its commanded position - the servo travel is being blocked or the position feedback does not follow the command. The system fails safe by locking the rear wheels straight and disabling rear-axle steering. Porsche Technical Information 07/25 (ENU 4883) documents C11D1F5 "Travel blocked (000028)" stored together with C1445F2 on 2025-onward 992 Carrera GTS, Carrera 4 GTS, Turbo and Turbo S with rear axle steering (M-No. 0N5). On Porsche it is documented across 1 model: 911.
What are the most common causes of C11D1?
The most common causes of C11D1 are: Rear axle steering control unit software calibration issue - Porsche's documented remedy is re-programming with PIWIS Tester software 43.200.031 or higher, Mechanical binding or obstruction in the rear-axle steering actuator, Debris, impact, or corrosion damage to the servo motor or its linkage, Internal servo motor or position sensor fault. The specific cause varies by vehicle.
How much does it cost to fix C11D1 on a Porsche?
Repair costs vary widely with the root cause and Porsche model; each issue on this page carries its own estimate where one is published.
Looking for C11D1 on a different make?
View C11D1 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.