P0A78
Drive Motor Inverter Performance Issue
What does the P0A78 code mean?
The P0A78 code indicates a performance problem with the drive motor inverter, which converts DC battery power to AC for the electric motor. This can be caused by internal faults, poor connections, or overheating, leading to reduced power or drivability issues.
High
Severity
$50-$150
Typical Cost
High
Frequency
01. Most Common Causes
- Faulty inverter module
- Poor electrical connections or wiring issues
- Overheating due to cooling system failure
02. Symptoms You Will Notice
- Reduced motor power or acceleration
- Check engine light illuminated
- Vehicle may enter limp mode
03. Step-by-Step Diagnosis
1
Step 1: Scan for additional codes and check freeze frame data.
2
Step 2: Inspect inverter cooling system and electrical connections.
3
Step 3: Test inverter output using a multimeter or diagnostic tool.
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04. Commonly Affected Makes
ToyotaVolkswagen
FordChevrolet
HondaHyundai / Kia
NissanBMW
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it may cause further damage or leave you stranded. The vehicle may enter limp mode, limiting speed.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Inverter replacement can be $1,000-$3,000 or more, depending on the vehicle.