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Home/DTC Codes/Mitsubishi/Lancer/2011-2011 2.4L I4/P2603
P2603

Coolant Pump A Control Circuit High

2011-2011 Mitsubishi Lancer 2.4L I4

Moderate SeverityPowertrainGeneric (SAE)

The 2011 Mitsubishi Lancer is equipped with a 2.4L inline-4 engine. Below you'll find detailed p2603 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

High voltage on auxiliary coolant pump circuit.

Symptoms

  • Check engine light
  • Pump runs constantly

Common Causes

  • Open ground
  • Short to power
  • Control module issue

Diagnostic Steps

  1. Check ground circuit
  2. Measure voltage

Repair Notes

Repair wiring or replace pump.

Related Codes

P2600Coolant Pump A Control Circuit Open

Other Powertrain Codes

P2603 on Other Vehicles

Mitsubishi 3000GT

1996-1996 3.0L V6 Twin Turbo

Mitsubishi 3000GT

1997-1997 3.0L V6 Twin Turbo

Mitsubishi 3000GT

1998-1998 3.0L V6 Twin Turbo

Mitsubishi 3000GT

1999-1999 3.0L V6 Twin Turbo

Mitsubishi Colt JP

2002-2002 1.3L I4 4A90

Mitsubishi Colt JP

2002-2002 1.5L I4 4A91

Mitsubishi Colt JP

2003-2003 1.3L I4 4A90

Mitsubishi Colt JP

2003-2003 1.5L I4 4A91

Common Questions

What does code P2603 mean on a 2011-2011 Mitsubishi Lancer?

P2603 stands for "Coolant Pump A Control Circuit High". High voltage on auxiliary coolant pump circuit.

What are the symptoms of P2603 on a Mitsubishi Lancer?

Common symptoms of P2603 include: Check engine light, Pump runs constantly.

What causes P2603 on a 2011-2011 Mitsubishi Lancer?

Common causes of P2603 include: Open ground, Short to power, Control module issue.

Last updated: March 2026

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