OBD Guide
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P16C9

Engine Mount Control Unit Internal Circuit Malfunction

P16C9 is an OBD-II diagnostic trouble code meaning: Engine Mount Control Unit Internal Circuit Malfunction. Common causes: engine mount control unit malfunction, damage to internal electronic components. Estimated repair cost: $56–167.

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

Symptoms

  • Increased engine vibrations
  • Rattling sound from the engine compartment
  • Unstable engine operation at idle
  • Check Engine Light Illuminates

Causes

  • Engine mount control unit malfunction
  • Damage to internal electronic components
  • Control unit power supply problems
  • Short circuit in control circuit
  • Contact corrosion

How to Fix

  1. Check the power and ground of the control unit
  2. Inspect the wiring harness for damage
  3. Check control circuit resistance
  4. Replace engine mount control unit if necessary

Related codes

P16CAP16CB

FAQ

What does the P16C9 code mean?

P16C9 is an OBD-II diagnostic trouble code that indicates: Engine Mount Control Unit Internal Circuit Malfunction

What causes a P16C9 error code?

The most common causes of P16C9 include: Engine mount control unit malfunction; Damage to internal electronic components; Control unit power supply problems; Short circuit in control circuit.

How do I fix a P16C9 diagnostic trouble code?

To fix P16C9: Check the power and ground of the control unit. Inspect the wiring harness for damage. Check control circuit resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P16C9?

Yes, but get it checked soon

How much does it cost to fix P16C9?

The estimated repair cost for P16C9 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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