P0AFA on Cadillac
14V Power Module System Voltage
P0AFA on Cadillac vehicles indicates 14v power module system voltage. Au7o has documented this code across 1 Cadillac model — most commonly on ELR. 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. Typical repair costs on Cadillac range from $1,000 to $8,000, depending on the specific model and root cause.
Common Causes of P0AFA
- •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
P0AFA on Cadillac by Model
Cadillac ELR(1 issue)
- High-Voltage Battery Capacity Degradation and Reduced EV Range2014-2016
The Cadillac ELR (based on the Chevrolet Volt platform) uses a 16.5 kWh lithium-ion battery pack rated for 37 miles of EV range. Owners report noticeable capacity degradation after 5-7 years, with usable EV range dropping to 25-30 miles. The battery management system restricts capacity as cells degrade. While GM's Voltec system is generally more reliable than pure EV batteries due to active thermal management, the ELR's limited production means replacement battery modules are scarce and expensive.
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View P0AFA across all makes →Frequently Asked Questions
What does P0AFA mean on 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 specifically, this code is documented across 1 model.
What causes P0AFA on Cadillac vehicles?▼
Common causes on Cadillac: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0AFA on a Cadillac?▼
Repair costs on Cadillac range from $1,000 to $8,000, depending on the specific model and root cause.
Which Cadillac models have P0AFA documented?▼
Au7o has documented P0AFA on 1 Cadillac model: ELR.