Open circuit, short to ground or short to voltage in the wiring of the load connected to driver 4 line 1; Faulty actuator, solenoid or relay on that driver circuit, with a shorted or open coil; Corroded, loose or damaged connector terminals at the control unit or the load; Poor power or earth supply to the control unit or to the load's supply fuse or relay; Internal fault in the control unit output driver; Outdated control unit software, only if a manufacturer bulletin lists it for this code on your model.

P1671

Driver 4 Line 1.

Saturn
Powertrain
Manufacturer code
Medium severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
6: AreaComputer and output circuits
71: FaultThe specific fault in that area

What it means

On Saturn, P1671 is a manufacturer-specific code described as 'Driver 4 Line 1'. It points to a fault in one of the control unit's output driver circuits (driver 4, line 1), which switch a load to ground. The control unit sets it when the commanded state of that driver does not match the voltage it sees on the circuit. Which component sits on that driver depends on the model, engine and year, so confirm it in the factory wiring information.

Symptoms

Malfunction indicator lamp on
Possible poor running, hesitation or rough idle, depending on which load the driver controls
Reduced performance or a drivability complaint that comes and goes
Possible related codes for the circuit or component the driver controls
Possible gear selection or shift complaints if the driver is shared with a transmission output

Possible causes

Open circuit, short to ground or short to voltage in the wiring of the load connected to driver 4 line 1likely
Faulty actuator, solenoid or relay on that driver circuit, with a shorted or open coillikely
Corroded, loose or damaged connector terminals at the control unit or the loadpossible
Poor power or earth supply to the control unit or to the load's supply fuse or relaypossible
Internal fault in the control unit output driverrare
Outdated control unit software, only if a manufacturer bulletin lists it for this code on your modelrare

How to diagnose

Read all stored and pending codes and the freeze frame data, and note any other driver or circuit codes that set alongside P1671.
Look up the wiring diagram for your model and engine to identify which component is on driver 4 line 1.
Inspect the wiring, connectors and terminals for that circuit for chafing, heat damage, water ingress, corrosion and pushed-back pins.
Check the fuse and supply voltage to the load, and check the control unit power and earth connections.
Measure the resistance of the component against the specification for your model, and check for a short to earth or to voltage.
Check the wiring between the component and the control unit for continuity and for shorts, with the connectors disconnected.
Use a scan tool that supports output tests to command the component and confirm that it responds and the circuit switches correctly.
Only after wiring, supply and component are proven good, consider the control unit, and check for a relevant software update or bulletin.

How to fix

Repair or replace damaged wiring and clean or replace corroded connector terminals.
Replace the faulty actuator, solenoid or relay once testing has confirmed it is out of specification.
Restore the correct supply or earth, including any blown fuse, after finding out why it failed.
Repair or replace the control unit if testing proves the output driver is faulty, and have it programmed as required.
Clear the codes after the repair and road test to confirm that P1671 does not return.

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but get it checked soon because the affected system may not work properly and the fault could get worse. Stop driving if it runs very badly, goes into limp mode or has shifting problems.

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