OBD Guide
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P1C20

Drive Motor 'A' Inverter Voltage Too Low

P1C20 is an OBD-II diagnostic trouble code meaning: Drive Motor 'A' Inverter Voltage Too Low. Common causes: motor inverter fault, problems with high voltage battery. Estimated repair cost: $556–1667.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$556–1667 (est.)

Symptoms

  • Reduced engine power
  • Warning messages on the dashboard
  • Uneven operation of the electric motor
  • The vehicle goes into emergency mode
  • Possible problems with battery charging

Causes

  • Motor inverter fault
  • Problems with high voltage battery
  • Inverter cooling system malfunction
  • Damage to high voltage cables
  • Problems with control software

How to Fix

  1. Checking the condition of the high-voltage battery
  2. Motor inverter diagnostics
  3. Checking the inverter cooling system
  4. Inspection of high voltage connections and cables
  5. Control system software update

Related codes

P1C21P1C22P0AFA

FAQ

What does the P1C20 code mean?

P1C20 is an OBD-II diagnostic trouble code that indicates: Drive Motor 'A' Inverter Voltage Too Low

What causes a P1C20 error code?

The most common causes of P1C20 include: Motor inverter fault; Problems with high voltage battery; Inverter cooling system malfunction; Damage to high voltage cables.

How do I fix a P1C20 diagnostic trouble code?

To fix P1C20: Checking the condition of the high-voltage battery. Motor inverter diagnostics. Checking the inverter cooling system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1C20?

Do not drive — repair immediately

How much does it cost to fix P1C20?

The estimated repair cost for P1C20 is $556–1667. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat