P0AFA on Cadillac: How to Diagnose & Fix
14V Power Module System Voltage
1 Cadillac model · 1 documented issue · 1 critical
P0AFA on Cadillac by model: symptoms, diagnosis and fix
GM customer-satisfaction program N172130462 covered certain 2014-2016 ELR vehicles whose original HPCM2 calibration might not provide enough warning before a low high-voltage cell caused reduced or lost propulsion. The software adds warning time; it does not restore battery capacity. The program expired in 2021 and was not a recall.
Common Symptoms
- Propulsion Power Reduced message
- Loss of propulsion
- Vehicle may not enter Ready mode
How to Fix
If reduced propulsion is active, stop in a safe location and arrange qualified EV service or towing. A Cadillac dealer should check the VIN, program and software history and perform the current high-voltage battery diagnosis. Do not assume current free coverage or order battery parts from this card.
Sources for this issue (1)
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 Cadillac?
P0AFA stands for "14V Power Module System Voltage." P0AFA is a hybrid/electric vehicle code indicating the computer detected low voltage in the 14-volt power module system — the converter that supplies the conventional 12V/14V electrical system in a hybrid or EV (the equivalent of a traditional alternator). The 14V power module (often a DC-DC converter) steps down the high-voltage battery to power lights, accessories, and the auxiliary 12V battery. When the monitored output voltage falls below the expected threshold, this code is set. It generally indicates the low-voltage electrical system isn't being properly charged, which can lead to a dead 12V battery and a no-start condition. On Cadillac it is documented across 1 model: ELR.
What are the most common causes of P0AFA?
The most common causes of P0AFA are: Failing DC-DC converter / 14V power module, Weak or failing auxiliary 12V battery, Corroded or loose 12V battery terminals and ground connections, Damaged wiring or connectors in the low-voltage charging circuit, Excessive electrical load draining the system, Fault in the high-voltage battery supply to the converter, Internal control module or software fault. The specific cause varies by vehicle.
How much does it cost to fix P0AFA on a Cadillac?
Repair costs vary widely with the root cause and Cadillac 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 →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.