OBD Guide
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P1C22

12V Auxiliary Battery Voltage Too Low

P1C22 is an OBD-II diagnostic trouble code meaning: 12V Auxiliary Battery Voltage Too Low. Common causes: low auxiliary battery, generator malfunction. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Dashboard warning
  • Disabling additional systems
  • Problems with the start-stop system
  • Reduced performance of the hybrid system
  • Problems starting the engine

Causes

  • Low auxiliary battery
  • Generator malfunction
  • Bad contacts in the circuit
  • Faulty relays or fuses
  • Problems with the charging system

How to Fix

  1. Check auxiliary battery voltage
  2. Check the condition of the terminals and connections
  3. Test the generator
  4. Check charging circuit
  5. Replace the battery if necessary

Related codes

P1C21P1C23P0562

FAQ

What does the P1C22 code mean?

P1C22 is an OBD-II diagnostic trouble code that indicates: 12V Auxiliary Battery Voltage Too Low

What causes a P1C22 error code?

The most common causes of P1C22 include: Low auxiliary battery; Generator malfunction; Bad contacts in the circuit; Faulty relays or fuses.

How do I fix a P1C22 diagnostic trouble code?

To fix P1C22: Check auxiliary battery voltage. Check the condition of the terminals and connections. Test the generator. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1C22?

Yes, but get it checked soon

How much does it cost to fix P1C22?

The estimated repair cost for P1C22 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat