OBD Guide
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P16D9

Powertrain Control Module Internal Circuit Malfunction

P16D9 is an OBD-II diagnostic trouble code meaning: Powertrain Control Module Internal Circuit Malfunction. Common causes: internal short circuit in pcm, damage to the electronic components of the module. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Unstable engine operation
  • Power Loss
  • Gear shifting problems
  • Check Engine light comes on
  • The car may go into emergency mode

Causes

  • Internal short circuit in PCM
  • Damage to the electronic components of the module
  • PCM power problems
  • Contact corrosion
  • Control module overheating

How to Fix

  1. Check the integrity of the wiring harness to the PCM
  2. Check the supply voltage and grounding of the module
  3. Inspect the PCM for external damage
  4. Reflash or replace the control module
  5. Calibrate new PCM

Related codes

P0601P0602P0603

FAQ

What does the P16D9 code mean?

P16D9 is an OBD-II diagnostic trouble code that indicates: Powertrain Control Module Internal Circuit Malfunction

What causes a P16D9 error code?

The most common causes of P16D9 include: Internal short circuit in PCM; Damage to the electronic components of the module; PCM power problems; Contact corrosion.

How do I fix a P16D9 diagnostic trouble code?

To fix P16D9: Check the integrity of the wiring harness to the PCM. Check the supply voltage and grounding of the module. Inspect the PCM for external damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P16D9?

Do not drive — repair immediately

How much does it cost to fix P16D9?

The estimated repair cost for P16D9 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat