Damaged, chafed or corroded wiring between the control unit and the fan solenoid; Faulty or corroded connector at the hydraulic fan solenoid; Failed hydraulic cooling fan solenoid with an open or shorted coil; Poor power or earth supply to the solenoid circuit, such as a blown fuse or relay problem where fitted; Fault in the hydraulic fan drive or pump assembly affecting solenoid operation; Internal driver fault in the engine control unit.

P1499

Open Or Shorted Condition Detected In The Hydraulic Cooling Fan Solenoid Control.

Plymouth
Powertrain
Manufacturer code
High severity

How this code is built

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

What it means

On Plymouth models, P1499 means the engine control unit has detected an open circuit or a short in the control circuit for the hydraulic cooling fan solenoid. The control unit drives the solenoid to vary fan speed and monitors the circuit. When the expected electrical feedback is missing or out of range, it sets the code.

Symptoms

Engine overheating, especially in traffic or at idle
Cooling fan running at full speed constantly or not running at all
Temperature gauge reading higher than normal
Air conditioning performance poor at idle
Malfunction indicator lamp on
Possible whining or noise from the fan or its hydraulic pump

Possible causes

Damaged, chafed or corroded wiring between the control unit and the fan solenoidlikely
Faulty or corroded connector at the hydraulic fan solenoidlikely
Failed hydraulic cooling fan solenoid with an open or shorted coillikely
Poor power or earth supply to the solenoid circuit, such as a blown fuse or relay problem where fittedpossible
Fault in the hydraulic fan drive or pump assembly affecting solenoid operationpossible
Internal driver fault in the engine control unitrare

How to diagnose

Read the stored codes and freeze frame data, noting engine temperature and conditions when the code set, and check for other cooling or power supply codes
Visually inspect the fan solenoid wiring and connector for chafing, heat damage, fluid contamination, corrosion or loose pins
Check the relevant fuses and any relay in the solenoid supply, using the vehicle wiring diagram for the specific model and engine
Measure the solenoid coil resistance and compare it with the manufacturer specification
Check the solenoid circuit for supply voltage, earth and signal from the control unit, and test for shorts to earth or voltage
Use a suitable scan function to command the fan and confirm the solenoid and fan respond
Inspect the hydraulic system for correct fluid level, leaks and pump operation, following the model-specific procedure
If wiring and solenoid test good, check the control unit driver output and connector before considering the control unit

How to fix

Repair or replace damaged wiring and terminals in the solenoid circuit
Clean, repair or replace the solenoid connector
Replace the hydraulic fan solenoid if its coil is open or shorted
Restore the power supply by replacing a faulty fuse or relay, after finding why it failed
Repair the hydraulic fan drive or pump and correct the fluid level where found faulty
Repair or replace the control unit 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 cooling fan control can cause overheating and serious engine damage. If you must move the car, keep trips very short and stop immediately if the temperature gauge rises.

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