OBD Guide
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P1108

Dual Alternator Battery Lamp Circuit Malfunction

P1108 is an OBD-II diagnostic trouble code meaning: Dual Alternator Battery Lamp Circuit Malfunction. Common causes: open or short circuit in the control lamp circuit, faulty relay or fuse. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Check engine light is on
  • Battery charge lamp flashes or does not work
  • Battery charging problems
  • Reduced performance of electrical systems
  • Unstable engine operation at idle

Causes

  • Open or short circuit in the control lamp circuit
  • Faulty relay or fuse
  • Problems with the generator
  • Engine control unit malfunction
  • Wiring harness damage

How to Fix

  1. Check the condition of fuses and relays
  2. Inspect the wiring harness for damage
  3. Check generator operation
  4. Test the warning lamp circuit
  5. If necessary, replace faulty components

Related codes

P1107P1109P1110

Error P1108 by Vehicle Brand

AcuraBuickCadillacChevroletChryslerFordGMGMCHondaInfinitiLincolnMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1108 code mean?

P1108 is an OBD-II diagnostic trouble code that indicates: Dual Alternator Battery Lamp Circuit Malfunction

What causes a P1108 error code?

The most common causes of P1108 include: Open or short circuit in the control lamp circuit; Faulty relay or fuse; Problems with the generator; Engine control unit malfunction.

How do I fix a P1108 diagnostic trouble code?

To fix P1108: Check the condition of fuses and relays. Inspect the wiring harness for damage. Check generator operation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1108?

Yes, but get it checked soon

How much does it cost to fix P1108?

The estimated repair cost for P1108 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat