OBD Guide
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P1794

Battery Supply Circuit Malfunction

P1794 is an OBD-II diagnostic trouble code meaning: Battery Supply Circuit Malfunction. Common causes: battery terminal corrosion, loose or damaged connections. Estimated repair cost: $6–33.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • Problems starting the engine
  • Unstable engine operation
  • Check Engine Light Is On
  • Power Loss
  • Malfunctions of electronic systems

Causes

  • Battery terminal corrosion
  • Loose or damaged connections
  • Faulty wiring harness
  • Relay or fuse problems
  • Generator malfunction

How to Fix

  1. Check and clean battery terminals
  2. Check connections and tighten if necessary
  3. Inspect the wiring harness for damage
  4. Check relays and fuses
  5. Check generator operation

Related codes

P1795P1796

Error P1794 by Vehicle Brand

JaguarKiaMazdaNissan

FAQ

What does the P1794 code mean?

P1794 is an OBD-II diagnostic trouble code that indicates: Battery Supply Circuit Malfunction

What causes a P1794 error code?

The most common causes of P1794 include: Battery terminal corrosion; Loose or damaged connections; Faulty wiring harness; Relay or fuse problems.

How do I fix a P1794 diagnostic trouble code?

To fix P1794: Check and clean battery terminals. Check connections and tighten if necessary. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1794?

Yes, but get it checked soon

How much does it cost to fix P1794?

The estimated repair cost for P1794 is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat