OBD Guide
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P1793

Ignition Supply Malfunction

P1793 is an OBD-II diagnostic trouble code meaning: Ignition Supply Malfunction. Common causes: damage to the ignition system wiring harness, ignition relay malfunction. 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
  • Difficulty starting the engine
  • Power Loss
  • Increased fuel consumption
  • Check Engine Light Is On

Causes

  • Damage to the ignition system wiring harness
  • Ignition relay malfunction
  • Problems with the ignition fuse
  • Short circuit in the circuit
  • Ignition coil malfunction

How to Fix

  1. Check the condition of the ignition system fuses
  2. Inspect the wiring harness for damage
  3. Check the functionality of the ignition relay
  4. Diagnose the ignition coil
  5. Check the voltage in the power circuit

Related codes

P1791P1792P1794

Error P1793 by Vehicle Brand

AcuraBuickCadillacChevroletGMGMCHondaInfinitiJaguarMazdaNissanOldsmobileSaturnVolkswagen

FAQ

What does the P1793 code mean?

P1793 is an OBD-II diagnostic trouble code that indicates: Ignition Supply Malfunction

What causes a P1793 error code?

The most common causes of P1793 include: Damage to the ignition system wiring harness; Ignition relay malfunction; Problems with the ignition fuse; Short circuit in the circuit.

How do I fix a P1793 diagnostic trouble code?

To fix P1793: Check the condition of the ignition system fuses. Inspect the wiring harness for damage. Check the functionality of the ignition relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1793?

Limited driving only, diagnose soon

How much does it cost to fix P1793?

The estimated repair cost for P1793 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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