OBD Guide
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P1903

Engine Coolant Hydraulic Blower Motor Solenoid Short To Positive

P1903 is an OBD-II diagnostic trouble code meaning: Engine Coolant Hydraulic Blower Motor Solenoid Short To Positive. Common causes: short circuit in solenoid circuit, fan solenoid malfunction. Estimated repair cost: $28–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$28–89 (est.)

Symptoms

  • Continuous cooling fan operation
  • Engine overheating
  • Increased fuel consumption
  • Check engine light comes on
  • Reduced engine power

Causes

  • Short circuit in solenoid circuit
  • Fan solenoid malfunction
  • Wiring harness damage
  • Problems with the engine control unit
  • Corrosion of electrical contacts

How to Fix

  1. Check solenoid circuit for short circuit
  2. Test solenoid resistance
  3. Inspect the wiring harness for damage
  4. Replace faulty solenoid if necessary
  5. Reset the error code and check the system

Related codes

P1900P1901P1902

Error P1903 by Vehicle Brand

FordLincolnMercury

FAQ

What does the P1903 code mean?

P1903 is an OBD-II diagnostic trouble code that indicates: Engine Coolant Hydraulic Blower Motor Solenoid Short To Positive

What causes a P1903 error code?

The most common causes of P1903 include: Short circuit in solenoid circuit; Fan solenoid malfunction; Wiring harness damage; Problems with the engine control unit.

How do I fix a P1903 diagnostic trouble code?

To fix P1903: Check solenoid circuit for short circuit. Test solenoid resistance. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1903?

Limited driving only, diagnose soon

How much does it cost to fix P1903?

The estimated repair cost for P1903 is $28–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat