P0AFA on Cadillac: How to Diagnose & Fix
Hybrid/EV Battery System Voltage Low
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.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
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 "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 Cadillac it is documented across 1 model: ELR.
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 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.