OBD Guide
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P1604

Loss Of IPC Serial Data Conditions

P1604 is an OBD-II diagnostic trouble code meaning: Loss Of IPC Serial Data Conditions. Common causes: broken or damaged wires between the ecu and ipc, corrosion of contacts in connectors. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Some indicators on the dashboard do not work
  • Speedometer or tachometer does not function
  • The Check Engine light comes on
  • No dashboard backlight
  • Problems with the on-board computer

Causes

  • Broken or damaged wires between the ECU and IPC
  • Corrosion of contacts in connectors
  • Instrument cluster malfunction
  • Dashboard power problems
  • Failures in ECU software

How to Fix

  1. Check the integrity of the wiring between the ECU and IPC
  2. Clean and check all connections
  3. Instrument cluster power diagnostics
  4. Check the operation of the dashboard
  5. Update or reflash the ECU software

Related codes

U0155U0164P1605

Error P1604 by Vehicle Brand

BMWBuickCadillacChevroletGMGMCMazdaOldsmobileSaturnVolkswagen

FAQ

What does the P1604 code mean?

P1604 is an OBD-II diagnostic trouble code that indicates: Loss Of IPC Serial Data Conditions

What causes a P1604 error code?

The most common causes of P1604 include: Broken or damaged wires between the ECU and IPC; Corrosion of contacts in connectors; Instrument cluster malfunction; Dashboard power problems.

How do I fix a P1604 diagnostic trouble code?

To fix P1604: Check the integrity of the wiring between the ECU and IPC. Clean and check all connections. Instrument cluster power diagnostics. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1604?

Yes, but get it checked soon

How much does it cost to fix P1604?

The estimated repair cost for P1604 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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