What Does C1755 Mean?
The power management system has initiated a protective shutdown due to an overcurrent, overvoltage, or overtemperature condition. This code is commonly found in hybrid or electric vehicle powertrains where the motor controller limits power output to prevent damage to the inverter, battery, or electric motor.
Safety Warning
Vehicle has shut down to prevent damage or fire risk. Do not attempt to restart repeatedly. Have the vehicle inspected by a qualified HV-certified technician before driving.
Common Causes
30%
Overheating of the inverter or motor controller due to coolant flow restriction
25%
Battery pack voltage outside safe operating range (too high or too low)
25%
Excessive current draw from a partially shorted motor winding
20%
Failed temperature sensor causing premature shutdown
Diagnostic Steps
1
Step 1: Review freeze frame data to determine what parameter triggered the shutdown — check inverter temperature, battery voltage, and motor current at the time of the fault.
2
Step 2: Inspect the HV coolant system — verify coolant level, pump operation, and check for blockages or air pockets in the inverter cooling loop.
3
Step 3: Monitor battery pack voltage and individual cell voltages for out-of-range cells using the scan tool's battery diagnostic menu.
4
Step 4: Check motor phase resistance between the three motor leads (U, V, W) — all three should be equal within 5%. Significant imbalance indicates a winding fault.
5
Step 5: If temperature-related, verify all coolant temperature sensors with a DVOM and compare to actual measured coolant temperature.
Estimated Repair Cost
$300 - $3,000
Parts + labor, varies by vehicle and location
The power management system has initiated a protective shutdown due to an overcurrent, overvoltage, or overtemperature condition. This code is commonly found in hybrid or electric vehicle powertrains where the motor controller limits power output to prevent damage to the inverter, battery, or electr...
The most common cause of C1755 (Power Limit Shutdown Fault) is: Overheating of the inverter or motor controller due to coolant flow restriction
Typical repair costs for C1755 range from $300 to $3,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle has shut down to prevent damage or fire risk. Do not attempt to restart repeatedly. Have the vehicle inspected by a qualified HV-certified technician before driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1755 to identify the root cause.
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Quick Info
Category
Chassis
System
Hybrid/Electric Powertrain
Difficulty
Type
Manufacturer
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