P1905 Charge Air Coolant Pump Relay Short to Positive

• OBD2 Code: P1905
• Description: Charge Air Coolant Pump Relay Short to Positive
• Definition: This code indicates that there is a short circuit condition in the charge air coolant pump relay, specifically where the relay is receiving voltage from a positive source when it should not be. This can lead to improper functioning of the charge air cooling system.

p1905 – Charge Air Coolant Pump Relay Short to Positive

Typical severity: Moderate

Common Causes

p1905 – Charge Air Coolant Pump Relay Short to Positive

Common causes:

• Faulty charge air coolant pump relay
• Short circuit in the wiring of the charge air coolant pump relay
• Corrosion or poor connection in the charge air coolant pump relay circuit

 

Common Misdiagnosis

OBD2 Code: P1905

Description: Charge Air Coolant Pump Relay Short to Positive

Common Misdiagnosis: Replacing the charge air coolant pump without checking the relay or wiring for faults.

 

Common Diagnostic Steps

OBD2 Code: P1905

Description: Charge Air Coolant Pump Relay Short to Positive

• Check the charge air coolant pump relay for any signs of damage or corrosion.
• Inspect the wiring harness and connectors for any signs of wear, damage, or loose connections.
• Test the relay circuit for continuity and ensure there is no short to positive voltage.
• Verify that the charge air coolant pump is functioning correctly by testing its operation directly.
• If necessary, replace the faulty relay or repair any damaged wiring or connectors.
• Clear the code and test drive the vehicle to ensure the issue has been resolved.