OBD Guide
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P1EFC

Battery Charger Control Module System Voltage Low Voltage

P1EFC is an OBD-II diagnostic trouble code meaning: Battery Charger Control Module System Voltage Low Voltage. Common causes: charger control module malfunction, wiring problems or bad contacts. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Dashboard warning
  • Problems starting the engine
  • Reduced electrical system performance
  • Unstable charger operation

Causes

  • Charger control module malfunction
  • Wiring problems or bad contacts
  • Battery fault
  • Problems with the generator
  • Fuse or relay failure

How to Fix

  1. Check battery and generator voltage
  2. Inspect the wiring and contacts of the control module
  3. Check fuses and relays
  4. Replace the control module if necessary
  5. Test the charging system after repair

Related codes

P1EFDP1EFEP1EFF

FAQ

What does the P1EFC code mean?

P1EFC is an OBD-II diagnostic trouble code that indicates: Battery Charger Control Module System Voltage Low Voltage

What causes a P1EFC error code?

The most common causes of P1EFC include: Charger control module malfunction; Wiring problems or bad contacts; Battery fault; Problems with the generator.

How do I fix a P1EFC diagnostic trouble code?

To fix P1EFC: Check battery and generator voltage. Inspect the wiring and contacts of the control module. Check fuses and relays. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1EFC?

Limited driving only, diagnose soon

How much does it cost to fix P1EFC?

The estimated repair cost for P1EFC is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat