P2602 - A/C Coolant Pump Control Circuit Low

Introduction

The DTC P2602 fault code represents a problem with the coolant pump control circuit, indicating a low value in the control signal. This problem can affect the proper functioning of the cooling system and, consequently, the performance of the engine. In this article, we will explore the symptoms, causes, diagnosis and possible solutions for the DTC P2602 code, providing a useful reference for auto repairers.

Symptoms

When the P2602 trouble code occurs, symptoms may vary depending on the vehicle and operating conditions. However, the most common signs include:

  • Check engine warning light comes on
  • Engine overheating, especially under high load conditions
  • Reduced engine performance
  • Abnormal noises coming from the engine compartment
  • Possible loss of power while driving

Cause

The causes of the DTC P2602 code can be different and include both electrical and mechanical problems. The main causes can be:

  • Coolant pump failure :
    If the pump is not working properly, the control circuit may report a low value.

  • Damaged wiring :
    Broken wires or shorts in the wiring harness connecting the pump to the ECU can cause incorrect readings.

  • Engine control unit (ECU) problems :
    If the control unit fails to send an adequate signal to the pump, a low circuit warning may occur.

  • Faulty sensors :
    A malfunctioning coolant temperature sensor can affect the operation of the pump.

  • Blown fuses :
    Blown fuses associated with the coolant pump can interrupt the control circuit.

Diagnosis

Diagnosing the P2602 code requires a systematic approach to identify the root cause. Here are the recommended steps:

  1. DTC Code Scan :
    Use an OBD-II scanner to confirm the presence of the P2602 code and check for any related DTC codes, such as P2601 (Coolant Pump A Control Circuit High).

  2. Visual inspection :
    Check the pump wiring and connectors for signs of wear, damage, or corrosion.

  3. Pump Test :
    Use a multimeter to measure the voltage and continuity of the coolant pump. If the pump is not receiving voltage, you may need to examine the circuit further.

  4. Checking the fuses :
    Check that the fuses associated with the pump are working correctly and replace them if necessary.

  5. Checking the engine control unit (ECU) :
    If all other components are in working order, the ECU may be faulty and needs to be replaced or reprogrammed.

Resolution and repair

Once the causes of the problem have been identified, you can proceed with the necessary repairs:

  • Pump replacement :
    If the coolant pump is defective, replace it with a new replacement unit.

  • Wiring Repair :
    If damage is found to the cables or connectors, make the necessary repairs or replace the damaged components.

  • Replacing fuses :
    Replace blown fuses with appropriate replacements.

  • Reprogramming or replacing the ECU :
    If you suspect a problem with the engine control unit, you may need to reprogram or replace the unit.

Insight: Components involved in the failure

To better understand the problem associated with the DTC P2602 code, it is helpful to examine the mechanical and electrical components involved:

  • Coolant pump :
    This pump is responsible for circulating coolant through the engine and radiator. A malfunction can lead to overheating and engine damage.

  • Engine Control Unit (ECU) :
    The ECU controls various aspects of engine operation, including pump management. A fault in the ECU can affect the entire operation of the cooling system.

  • Coolant temperature sensor :
    This sensor monitors the coolant temperature and sends information to the ECU. If the sensor is faulty, it can cause incorrect readings and trigger the DTC code P2602.

  • Wiring and connectors :
    The cables connecting the pump to the ECU are essential for the correct functioning of the system. Any damage can interrupt the signal and cause malfunctions.

Conclusions

DTC P2602 can be a challenge for auto mechanics, but with a systematic approach to diagnosis and repair, the problem can be solved effectively. Identifying the root cause of the failure is essential to ensure the proper functioning of the cooling system and the health of the engine. Remember to perform regular checks and preventative inspections to reduce the risk of future failures and keep the vehicle in tip-top condition.

Important
Not all OBD2 codes used by one manufacturer are used by other brands, and may not have the same meaning.
The information presented here is for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any concerns about repairing your vehicle, please contact your repair shop.