OBD Guide
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P1A20

Hybrid Battery System Precharge Time Too Long

P1A20 is an OBD-II diagnostic trouble code meaning: Hybrid Battery System Precharge Time Too Long. Common causes: pre-charge relay malfunction, problems with high voltage contactor. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–278 (est.)

Symptoms

  • Hybrid system does not activate
  • Check engine light comes on
  • Hybrid system power reduction
  • The car goes into emergency mode
  • Error message on the dashboard

Causes

  • Pre-charge relay malfunction
  • Problems with high voltage contactor
  • Worn pre-charge resistor
  • Damage to the high voltage system wiring harness
  • Corrosion of contacts in the pre-charge circuit

How to Fix

  1. Check the condition of the pre-charge relay
  2. Test the precharge resistor
  3. Inspect high voltage contactors for wear
  4. Check the integrity of the high voltage system wiring harness
  5. Diagnose the condition of a high-voltage battery

Related codes

P1A00P1A10P0A80

FAQ

What does the P1A20 code mean?

P1A20 is an OBD-II diagnostic trouble code that indicates: Hybrid Battery System Precharge Time Too Long

What causes a P1A20 error code?

The most common causes of P1A20 include: Pre-charge relay malfunction; Problems with high voltage contactor; Worn pre-charge resistor; Damage to the high voltage system wiring harness.

How do I fix a P1A20 diagnostic trouble code?

To fix P1A20: Check the condition of the pre-charge relay. Test the precharge resistor. Inspect high voltage contactors for wear. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1A20?

Do not drive — repair immediately

How much does it cost to fix P1A20?

The estimated repair cost for P1A20 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat