OBD Guide
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P1A8A

42 Volt System Voltage High

P1A8A is an OBD-II diagnostic trouble code meaning: 42 Volt System Voltage High. Common causes: 42v generator malfunction, problems with the voltage regulator. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Interruptions in the operation of the electric power steering
  • Failure of some electronic systems
  • Noticeable voltage surges on the multimeter

Causes

  • 42V generator malfunction
  • Problems with the voltage regulator
  • Short circuit in power supply
  • Broken or corroded wires
  • 42V battery fault

How to Fix

  1. Check the voltage in the system with the engine running
  2. Diagnose 42V generator
  3. Check voltage regulator
  4. Inspect the wiring harness for damage
  5. If necessary, replace faulty components

Related codes

P1A8BP1A89P1A80

FAQ

What does the P1A8A code mean?

P1A8A is an OBD-II diagnostic trouble code that indicates: 42 Volt System Voltage High

What causes a P1A8A error code?

The most common causes of P1A8A include: 42V generator malfunction; Problems with the voltage regulator; Short circuit in power supply; Broken or corroded wires.

How do I fix a P1A8A diagnostic trouble code?

To fix P1A8A: Check the voltage in the system with the engine running. Diagnose 42V generator. Check voltage regulator. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1A8A?

Do not drive — repair immediately

How much does it cost to fix P1A8A?

The estimated repair cost for P1A8A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat