OBD Guide
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P1905

Charge Air Coolant Pump Relay Short To Positive

P1905 is an OBD-II diagnostic trouble code meaning: Charge Air Coolant Pump Relay Short To Positive. Common causes: short circuit in relay circuit, faulty pump relay. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Reduced engine power
  • Engine overheating
  • Increased fuel consumption
  • Check Engine Light Is On
  • The engine goes into emergency mode

Causes

  • Short circuit in relay circuit
  • Faulty pump relay
  • Wiring harness damage
  • Intercooler coolant pump problems
  • Short circuit in the engine ECU

How to Fix

  1. Check the integrity of wiring and connectors
  2. Check the functionality of the pump relay
  3. Check the operation of the intercooler coolant pump
  4. Check the condition of the fuses
  5. If necessary, replace the relay or pump

Related codes

P1906P1904P1907

FAQ

What does the P1905 code mean?

P1905 is an OBD-II diagnostic trouble code that indicates: Charge Air Coolant Pump Relay Short To Positive

What causes a P1905 error code?

The most common causes of P1905 include: Short circuit in relay circuit; Faulty pump relay; Wiring harness damage; Intercooler coolant pump problems.

How do I fix a P1905 diagnostic trouble code?

To fix P1905: Check the integrity of wiring and connectors. Check the functionality of the pump relay. Check the operation of the intercooler coolant pump. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1905?

Yes, but get it checked soon

How much does it cost to fix P1905?

The estimated repair cost for P1905 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat