P0AFA on Porsche: How to Diagnose & Fix
Hybrid/EV Battery System Voltage Low
1 Porsche model · 1 documented issue · 1 critical
P0AFA on Porsche by model: symptoms, diagnosis and fix
Some 2020-2024 Taycans built between October 2019 and February 2024 have high-voltage battery cell modules, made by LG Energy Solution in Poland, that can develop an internal short circuit. This can lead to overheating and, in some cases, a fire. Porsche says supplier production problems are the cause and that only a small share of cars is affected (it estimates about 2% of the 27,527 cars in the recall). This recall (Porsche codes ARB6/ARB7) expands and replaces the earlier battery recalls 23V-840, 24V-215 and 24V-217. Porsche added more cars after further data and hardware analysis. Porsche reports no warning to the driver before a fault, so the recall letter is usually the only sign. If Porsche does not have enough battery data for the car (ARB6), owners are told to limit charging to 80% until the fix is done. If Porsche can monitor the car's battery data over the air (ARB7), it watches the battery remotely and asks for the 80% limit only if it finds a problem, until the affected module is replaced. Porsche says cars built after March 4, 2024 are not affected because the supplier changed production.
Common Symptoms
- No warning sign before a fault; the first sign is usually a Porsche recall letter (ARB6/ARB7)
- Porsche asks you to limit charging to 80% while you wait for the fix
- After the recall software is installed: a battery warning on the head unit, with maximum charge limited to 80%
- Maximum charge later limited to less than 80% (about 50%) until the affected battery module is replaced
How to Fix
1) Check your VIN for open recalls: NHTSA 24V-732, Porsche ARB6 or ARB7. Earlier campaigns 23V-840, 24V-215 and 24V-217 also concern this battery. Or call Porsche at 1-800-767-7243 (1-800-PORSCHE). 2) If your letter says ARB6, or Porsche has told you about a battery anomaly, cap charging at 80% until the fix is done. In the PCM, select Charging, open the Profiles tab, tap "Edit General charging profile", set the charge level to 80 or less, turn on the maximum charge level via Optimized charging, activate the General charging profile, and make sure Direct charging is switched off (not blue). 3) Book the recall with a Porsche dealer. The dealer analyzes the battery modules first and replaces any module that shows anomalies, sometimes more than one. The dealer then installs the final fix, new on-board diagnostic software. 4) After the software is installed, it keeps checking the modules. If it finds an anomaly, a warning appears on the head unit and charging is limited, first to 80% and later to less than 80% (Porsche estimates about 50%), until the module is replaced. The recall work is free. If you already paid for this repair, you may be eligible for reimbursement.
Sources for this issue (4)
P0AFA 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 P0AFA mean on a Porsche?
P0AFA stands for "Hybrid/EV Battery System Voltage Low." P0AFA is a hybrid/electric vehicle code meaning the control module has detected that the total voltage of the high-voltage (hybrid/EV) battery pack is lower than expected. The pack voltage is monitored by the hybrid powertrain/battery control module; low pack voltage can come from a weak or failing battery, a fault in the pack's cables, fuse or contactors, or a faulty voltage-sensing circuit. Symptoms can include a hybrid system warning, reduced power or limp mode, and loss of electric-drive function. On Porsche it is documented across 1 model: Taycan.
What are the most common causes of P0AFA?
The most common causes of P0AFA are: Weak, degraded or imbalanced high-voltage battery pack, Open high-voltage battery fuse or contactor, Faulty high-voltage battery cable, ground or connection, Faulty battery voltage-sensing circuit or sensor, Battery control module or software fault. The specific cause varies by vehicle.
How much does it cost to fix P0AFA 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 P0AFA on a different make?
View P0AFA across all makes →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.