OBD Guide
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P1A89

42 Volt System Voltage Low

P1A89 is an OBD-II diagnostic trouble code meaning: 42 Volt System Voltage Low. Common causes: 42v generator malfunction, problems with the 42v system battery. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Dashboard warning light
  • Reduced power of electronic systems
  • Problems starting the engine
  • Incorrect operation of the hybrid system
  • Disabling some electronic features

Causes

  • 42V generator malfunction
  • Problems with the 42V system battery
  • Wiring damage
  • Power management module failure
  • Short circuit in the circuit

How to Fix

  1. Check the voltage in the 42V system
  2. Diagnose 42V generator
  3. Check battery condition
  4. Inspect the wiring for damage
  5. Check power management module

Related codes

P1A88P1A90P0A1A

FAQ

What does the P1A89 code mean?

P1A89 is an OBD-II diagnostic trouble code that indicates: 42 Volt System Voltage Low

What causes a P1A89 error code?

The most common causes of P1A89 include: 42V generator malfunction; Problems with the 42V system battery; Wiring damage; Power management module failure.

How do I fix a P1A89 diagnostic trouble code?

To fix P1A89: Check the voltage in the 42V system. Diagnose 42V generator. Check battery condition. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1A89?

Do not drive — repair immediately

How much does it cost to fix P1A89?

The estimated repair cost for P1A89 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat