OBD Guide
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P1397

System Voltage Out Of Self Test Range

P1397 is an OBD-II diagnostic trouble code meaning: System Voltage Out Of Self Test Range. Common causes: faulty generator, weak or dead battery. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable engine operation
  • Problems starting the engine
  • Dashboard flickering or dimming
  • Reduced power of electrical equipment

Causes

  • Faulty generator
  • Weak or dead battery
  • Damaged wiring or poor contacts
  • Faulty voltage regulator
  • Short circuit in the electrical system

How to Fix

  1. Check battery voltage with engine off
  2. Check the generator voltage with the engine running
  3. Inspect wiring and connections for damage
  4. Check voltage regulator
  5. Replace faulty components

Related codes

P0562P0563P0620

Error P1397 by Vehicle Brand

BMWBuickCadillacChevroletChryslerFordGMGMCJaguarLincolnMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1397 code mean?

P1397 is an OBD-II diagnostic trouble code that indicates: System Voltage Out Of Self Test Range

What causes a P1397 error code?

The most common causes of P1397 include: Faulty generator; Weak or dead battery; Damaged wiring or poor contacts; Faulty voltage regulator.

How do I fix a P1397 diagnostic trouble code?

To fix P1397: Check battery voltage with engine off. Check the generator voltage with the engine running. Inspect wiring and connections for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1397?

Limited driving only, diagnose soon

How much does it cost to fix P1397?

The estimated repair cost for P1397 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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