OBD Guide
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P16D5

F-CAN Malfunction Internal Malfunction

P16D5 is an OBD-II diagnostic trouble code meaning: F-CAN Malfunction Internal Malfunction. Common causes: open or short circuit in f-can wiring, fault in one of the modules connected to the bus. Estimated repair cost: $17–111.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–111 (est.)

Symptoms

  • Check Engine light comes on
  • Lost connection with some modules
  • Incorrect operation of vehicle systems
  • Problems starting the engine
  • Dashboard malfunctions

Causes

  • Open or short circuit in F-CAN wiring
  • Fault in one of the modules connected to the bus
  • Problems with module power supply
  • Corrosion of connectors
  • Damage to CAN bus terminators

How to Fix

  1. Check the integrity of the F-CAN bus wiring
  2. Check power supply and grounding of modules
  3. Diagnose each module connected to the bus
  4. Check signal quality using an oscilloscope
  5. Replace faulty components

Related codes

P16D4P16D6U0001

FAQ

What does the P16D5 code mean?

P16D5 is an OBD-II diagnostic trouble code that indicates: F-CAN Malfunction Internal Malfunction

What causes a P16D5 error code?

The most common causes of P16D5 include: Open or short circuit in F-CAN wiring; Fault in one of the modules connected to the bus; Problems with module power supply; Corrosion of connectors.

How do I fix a P16D5 diagnostic trouble code?

To fix P16D5: Check the integrity of the F-CAN bus wiring. Check power supply and grounding of modules. Diagnose each module connected to the bus. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P16D5?

Do not drive — repair immediately

How much does it cost to fix P16D5?

The estimated repair cost for P16D5 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat