P1498 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

P1498 Code failures by brands

P1498 CHRYSLER, DODGE, JEEP, MITSUBISHI: HIGH-SPEED RADIATOR FAN CONTROL RELAY CONDITION

Description of DTC code P1498

The cooling fan relay is used on vehicles that have an electric fan to cool the engine. The function of the relay is to convert a low voltage signal from the ECM (Engine Control Module) or a thermostatically controlled sensor. The relay takes the voltage signal and internally activates the relay which sends battery voltage to the cooling fan. By using a lower voltage signal to control the relay, the voltage on the rest of the wiring and charging system is lower. If this relay does not operate, the proper signal is not received and consequently, the fan cannot cool the system.

The cooling fan relay is normally installed in the fuse under the hood and the center of the relay, although in certain vehicles it is located in the electric fan assembly behind the radiator. It should be noted that, in these systems, the use of smaller diameter wiring is allowed, saving the space used by these.

DTC P1498 OBDII  is due to the PCM (Powertrain Control Module) detecting a short or open condition in the high-speed radiator fan relay circuit for 3 seconds.

Symptoms of fault code P1498

  • Check Engine lamp illuminated.
  • Engine temperatures are higher than normal.

Causes of OBD2 P1498

P1498 OBD2 diagnostic code is stored for one of the following reasons:

  • The radiator fan control relay wiring may have been damaged.
  • The radiator fan relay circuit connections could be faulty causing a short circuit.
  • The relay may be in poor condition.

Possible solutions of the DTC code P1498

To troubleshoot the P1498 OBDII fault code you must do the following:

  • Consult the Technical Service Bulletins.
  • Check the wiring of the radiator fan relay and verify that there are no deficiencies. If this check reveals corrosion or wear, make the necessary repairs or changes.
  • Measure the relay circuit voltages as recommended. Verify that the circuit is not shorted or open. If you detect one of these conditions, make the respective corrections.
  • Check that the fan relay resistance is within the proper range (30 to 70 ohms). If you get an out-of-range resistance, replace the relay.

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