OBD Guide
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P1904

Engine Coolant Hydraulic Blower Motor Solenoid Open Circuit/Short To Ground

P1904 is an OBD-II diagnostic trouble code meaning: Engine Coolant Hydraulic Blower Motor Solenoid Open Circuit/Short To Ground. Common causes: broken wires in the solenoid circuit, short circuit to ground. Estimated repair cost: $17–56.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Engine overheating
  • Cooling fan does not work
  • Check Engine Light Is On
  • Reduced engine power
  • Increased fuel consumption

Causes

  • Broken wires in the solenoid circuit
  • Short circuit to ground
  • Faulty fan solenoid
  • Fan relay problems
  • Engine control unit (ECU) malfunction

How to Fix

  1. Check the integrity of wiring and connections
  2. Check solenoid resistance
  3. Check fan relay operation
  4. Replace faulty solenoid if necessary
  5. Check and replace fuses if necessary

Related codes

P1905P1903P0480P0481

Error P1904 by Vehicle Brand

FordLincolnMercury

FAQ

What does the P1904 code mean?

P1904 is an OBD-II diagnostic trouble code that indicates: Engine Coolant Hydraulic Blower Motor Solenoid Open Circuit/Short To Ground

What causes a P1904 error code?

The most common causes of P1904 include: Broken wires in the solenoid circuit; Short circuit to ground; Faulty fan solenoid; Fan relay problems.

How do I fix a P1904 diagnostic trouble code?

To fix P1904: Check the integrity of wiring and connections. Check solenoid resistance. Check fan relay operation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1904?

Limited driving only, diagnose soon

How much does it cost to fix P1904?

The estimated repair cost for P1904 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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