OBD Guide
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P1634

Ignition 1 Power Circuit Low Voltage

P1634 is an OBD-II diagnostic trouble code meaning: Ignition 1 Power Circuit Low Voltage. Common causes: ignition circuit wiring problems, faulty ignition relay. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Unstable engine operation
  • Misfires
  • Difficulty starting the engine
  • Reduced engine power
  • Check Engine Light Is On

Causes

  • Ignition circuit wiring problems
  • Faulty ignition relay
  • Low battery
  • Problems with the generator
  • Engine control unit malfunction

How to Fix

  1. Check battery voltage
  2. Inspect the ignition circuit wiring for damage.
  3. Check the operation of the ignition relay
  4. Diagnose generator
  5. Check the engine control unit

Related codes

P1635P1636P1637

Error P1634 by Vehicle Brand

BMWBuickCadillacChevroletFordGMGMCKiaLincolnMazdaMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1634 code mean?

P1634 is an OBD-II diagnostic trouble code that indicates: Ignition 1 Power Circuit Low Voltage

What causes a P1634 error code?

The most common causes of P1634 include: Ignition circuit wiring problems; Faulty ignition relay; Low battery; Problems with the generator.

How do I fix a P1634 diagnostic trouble code?

To fix P1634: Check battery voltage. Inspect the ignition circuit wiring for damage.. Check the operation of the ignition relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1634?

Limited driving only, diagnose soon

How much does it cost to fix P1634?

The estimated repair cost for P1634 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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