OBD Guide
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P16D4

Battery Monitor Module Circuit Low Voltage

P16D4 is an OBD-II diagnostic trouble code meaning: Battery Monitor Module Circuit Low Voltage. Common causes: poor contact in the battery control module circuit, battery monitoring module malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Problems starting the engine
  • Reduced electrical system performance
  • Dashboard warnings
  • Unstable operation of on-board electronics

Causes

  • Poor contact in the battery control module circuit
  • Battery monitoring module malfunction
  • Battery problems
  • Open or short circuit in wiring
  • Generator malfunction

How to Fix

  1. Check the condition of the battery
  2. Inspect the connections and wiring of the control module
  3. Check the voltage at the module terminals
  4. Test the operation of the generator
  5. If necessary, replace the battery monitoring module

Related codes

P16D3P16D5P0562

FAQ

What does the P16D4 code mean?

P16D4 is an OBD-II diagnostic trouble code that indicates: Battery Monitor Module Circuit Low Voltage

What causes a P16D4 error code?

The most common causes of P16D4 include: Poor contact in the battery control module circuit; Battery monitoring module malfunction; Battery problems; Open or short circuit in wiring.

How do I fix a P16D4 diagnostic trouble code?

To fix P16D4: Check the condition of the battery. Inspect the connections and wiring of the control module. Check the voltage at the module terminals. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P16D4?

Yes, but get it checked soon

How much does it cost to fix P16D4?

The estimated repair cost for P16D4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat