P1492

What it means

P1492 is a manufacturer-specific code listed here as 'APLSOL Solenoid Circuit Malfunction'. It means the control unit found an electrical fault in the circuit that drives a solenoid it labels APLSOL, such as an open circuit, a short, or a driver that does not respond as commanded. The exact function of this solenoid depends on the make, model and engine, so confirm it against the manufacturer's data before replacing parts.

Symptoms

• Malfunction indicator lamp on
• Code stored with no obvious change in driveability
• Possible rough running or poor performance if the solenoid controls an engine function
• Possible failed emissions or readiness monitor not completing
• Intermittent fault that comes and goes with vibration or temperature

Possible causes

• Damaged, chafed or corroded wiring to the solenoid (open circuit, short to earth or short to supply)likely
• Poor connection at the solenoid or control unit plug (loose, corroded or pushed-out terminals)likely
• Failed solenoid with an open or shorted coillikely
• Blown fuse or a fault in the solenoid's power supply or earthpossible
• Water or contamination in the solenoid connector or solenoid bodypossible
• Faulty driver circuit inside the control unitrare
• Outdated control unit software where the manufacturer has issued a known fixrare

How to diagnose

1. Confirm the make-specific definition and location of the APLSOL solenoid in the manufacturer's service information for this model and engine.
2. Read all stored and pending codes and the freeze frame data, then note conditions such as engine temperature, speed and load when the fault set.
3. Visually inspect the solenoid, its wiring and connectors for chafing, heat damage, water ingress, corrosion and bent or loose terminals.
4. Check the relevant fuse and, where fitted, the relay, using the wiring diagram for the circuit.
5. Measure the solenoid coil resistance and compare it with the manufacturer's specification.
6. With the connector unplugged and the ignition on, check for supply voltage and a good earth at the harness side as the wiring diagram shows.
7. Use a scan tool's actuator test, if available, to command the solenoid and check that it clicks or responds, and check the control signal.
8. Wiggle-test the harness with the circuit monitored to find intermittent faults, and check the wiring between the solenoid and control unit for continuity and shorts.

How to fix

• Repair or replace damaged wiring and fix any short or open circuit found.
• Clean, repair or replace corroded or loose connector terminals, and seal out any water ingress.
• Replace the solenoid if its coil resistance or operation is out of specification.
• Replace a blown fuse only after finding and fixing the cause of the overload.
• Update the control unit software only if the manufacturer lists it as a fix for this fault, or repair or replace the control unit if the driver circuit is confirmed faulty.
• Clear the code after repair and road test to confirm it does not return and that monitors complete.

Can I keep driving?

This code for other makes

• P1492DodgeBattery Temperature Sensor Voltage Too High
• P1492JeepBattery Temperature Sensor Voltage Too High
• P1492MitsubishiBattery Temperature Sensor High Voltage
• P1492NissanEVAP Canister Purge Control Solenoid Valve Circuit
• P1492PlymouthBattery Temperature Sensor Voltage Too High
• P1492PontiacBattery Temperature Sensor Voltage Too High

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