What Does P0C0C Mean?
DTC P0C0C indicates that the DC power supply voltage to drive motor "A" inverter is reading below the expected threshold. This under-voltage condition prevents the inverter from producing adequate three-phase AC output for the motor. Common causes include a weak traction battery, excessive voltage drop in the HV cabling, or a partially failed contactor. The vehicle will enter reduced power mode to protect the inverter and motor from operating outside design parameters.
Safety Warning
Low inverter supply voltage can cause erratic motor behavior, reduced propulsion, and potential stalling in traffic. If caused by a high-resistance connection, there is a risk of thermal runaway at the fault point. Prompt diagnosis is essential.
Common Causes
30%
Traction battery degradation causing low pack voltage under load
25%
High-resistance connection at HV cable junction or contactor
20%
Partially failed or pitted main battery contactor
15%
HV cable damage causing excessive resistance
10%
Battery management system limiting voltage output due to cell imbalance
Diagnostic Steps
1
Step 1: Review freeze-frame data for battery SOC, pack voltage, cell balance status, and the load condition when the fault occurred. Check for battery-related DTCs (cell imbalance, isolation fault, contactor codes).
2
Step 2: Monitor the HV bus voltage in real-time with a scan tool during a load test or drive cycle. Compare the voltage at the battery terminals versus the inverter input — a difference greater than 5V under load indicates a wiring or connection issue.
3
Step 3: Inspect all HV connections from the battery to the inverter, paying special attention to the main contactors. Check for pitting, discoloration, or resistance across the contactor contacts.
4
Step 4: If the battery pack voltage itself is low, perform a battery health assessment including cell balance check, capacity test, and internal resistance measurement per the manufacturer's procedure.
5
Step 5: Use thermal imaging (if available) to identify hot spots along the HV cable routing that would indicate high-resistance connections or damaged cables.
Estimated Repair Cost
$400 - $8,000
Parts + labor, varies by vehicle and location
DTC P0C0C indicates that the DC power supply voltage to drive motor "A" inverter is reading below the expected threshold. This under-voltage condition prevents the inverter from producing adequate three-phase AC output for the motor. Common causes include a weak traction battery, excessive voltage d...
The most common cause of P0C0C (Drive Motor "A" Inverter Power Supply Circuit Low) is: Traction battery degradation causing low pack voltage under load
Typical repair costs for P0C0C range from $400 to $8,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Low inverter supply voltage can cause erratic motor behavior, reduced propulsion, and potential stalling in traffic. If caused by a high-resistance connection, there is a risk of thermal runaway at the fault point. Prompt diagnosis is essential.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C0C to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Hybrid/EV Drive Motor Inverter
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
