OBD Guide
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P1A16

Variable Voltage Controller Voltage Control Circuit

P1A16 is an OBD-II diagnostic trouble code meaning: Variable Voltage Controller Voltage Control Circuit. Common causes: open or short circuit in control circuit, variable voltage controller malfunction. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Unstable operation of the vehicle's electrical system
  • Periodic failures in the operation of on-board electronics
  • The Check Engine light comes on
  • Reduced battery efficiency

Causes

  • Open or short circuit in control circuit
  • Variable voltage controller malfunction
  • Damage to connectors or wiring harness
  • Problems with the engine control unit (ECU)

How to Fix

  1. Diagnose the voltage control circuit
  2. Check the condition of the connectors and wiring harness
  3. Replace the faulty voltage controller if necessary
  4. Update or reflash the control unit software

Related codes

P1A00P1A01P1A02

FAQ

What does the P1A16 code mean?

P1A16 is an OBD-II diagnostic trouble code that indicates: Variable Voltage Controller Voltage Control Circuit

What causes a P1A16 error code?

The most common causes of P1A16 include: Open or short circuit in control circuit; Variable voltage controller malfunction; Damage to connectors or wiring harness; Problems with the engine control unit (ECU).

How do I fix a P1A16 diagnostic trouble code?

To fix P1A16: Diagnose the voltage control circuit. Check the condition of the connectors and wiring harness. Replace the faulty voltage controller if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1A16?

Yes, but get it checked soon

How much does it cost to fix P1A16?

The estimated repair cost for P1A16 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat