Faulty high speed radiator fan ground control relay; Damaged, chafed or corroded wiring in the relay control circuit (open circuit or short to ground or voltage); Corroded or loose connector at the relay, fan or powertrain control module; Blown fuse or poor power or ground supply to the relay; Faulty radiator fan motor drawing excess current or causing a circuit fault; Internal fault in the powertrain control module driver circuit.

P1498

High speed Rad Fan Ground CTRL Rly Circuit.

Plymouth
Powertrain
Manufacturer code
High severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
4: AreaAuxiliary emission controls
98: FaultThe specific fault in that area

What it means

On Plymouth (Chrysler group) vehicles, P1498 means the powertrain control module has detected a fault in the circuit that controls the high speed radiator fan ground control relay. The module commands the relay on or off and monitors the circuit. If the voltage it sees does not match the command, such as a short, an open circuit or a stuck relay, it sets the code.

Symptoms

Check engine light on
Radiator fan not running at high speed
Engine running hot or temperature gauge climbing in traffic
Air conditioning performing poorly when stationary
Fan running constantly or at the wrong times
Possible overheating warning

Possible causes

Faulty high speed radiator fan ground control relaylikely
Damaged, chafed or corroded wiring in the relay control circuit (open circuit or short to ground or voltage)likely
Corroded or loose connector at the relay, fan or powertrain control modulepossible
Blown fuse or poor power or ground supply to the relaypossible
Faulty radiator fan motor drawing excess current or causing a circuit faultpossible
Internal fault in the powertrain control module driver circuitrare

How to diagnose

Read the stored codes and freeze frame data, noting engine temperature and whether any other cooling or fan codes are present
Check the relevant fuses and inspect the relay box for water ingress, burnt terminals or corrosion
Inspect the wiring and connectors between the relay, fan and powertrain control module for chafing, heat damage and corrosion
Check the relay for correct operation and swap it with a known good identical relay, or test it on the bench for coil resistance and contact operation
With the relay removed, check for battery voltage, a good ground and the control signal at the relay socket using a multimeter
Command the fan on with a scan tool bidirectional test and observe whether the relay clicks and the fan responds at high speed
Check the fan motor current draw and condition, and test circuit resistance to ground and to voltage against the wiring diagram for your model and engine
If the circuit and relay prove good, consider a powertrain control module fault, confirming against the manufacturer's procedure

How to fix

Replace the faulty fan relay with the correct specification part
Repair or replace damaged wiring and terminals in the control circuit
Clean or replace corroded connectors and restore good power and ground connections
Replace any blown fuse once the cause of the overload is found
Replace the radiator fan motor or assembly if it is faulty
Repair or replace the powertrain control module only after all other causes are ruled out

Can I keep driving?

High severity

Avoid driving until the fan operation is confirmed, as loss of high speed cooling can cause overheating and serious engine damage. If you must move the car, make a short trip only, keep an eye on the temperature gauge and stop at once if it rises.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.