OBD Guide
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P1D84

Intelligent Power Module Malfunction Or Signal Line Hi

P1D84 is an OBD-II diagnostic trouble code meaning: Intelligent Power Module Malfunction Or Signal Line Hi. Common causes: smart power module malfunction, open or short circuit in signal circuit. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Unstable engine operation
  • Power Loss
  • Check Engine light comes on
  • Problems starting the engine
  • Reduced efficiency of vehicle systems

Causes

  • Smart Power Module Malfunction
  • Open or short circuit in signal circuit
  • Poor contact in connectors
  • Wiring harness damage
  • Module power problems

How to Fix

  1. Check signal circuit integrity
  2. Inspect connectors and contacts for corrosion or damage
  3. Check the power supply and ground of the module
  4. Test the smart power module
  5. Replace module if necessary

Related codes

P1D85P1D86P1D87

FAQ

What does the P1D84 code mean?

P1D84 is an OBD-II diagnostic trouble code that indicates: Intelligent Power Module Malfunction Or Signal Line Hi

What causes a P1D84 error code?

The most common causes of P1D84 include: Smart Power Module Malfunction; Open or short circuit in signal circuit; Poor contact in connectors; Wiring harness damage.

How do I fix a P1D84 diagnostic trouble code?

To fix P1D84: Check signal circuit integrity. Inspect connectors and contacts for corrosion or damage. Check the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1D84?

Do not drive — repair immediately

How much does it cost to fix P1D84?

The estimated repair cost for P1D84 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat