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P1676

Driver 4 Line 6.

  • Saturn
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
6
AreaComputer and output circuits
76
FaultThe specific fault in that area

What it means

P1676 is a Saturn (GM) specific code, shown as 'Driver 4 Line 6'. It points to a fault on one of the control module's output driver circuits. The module commands that output, then sees a voltage or current that doesn't match what it expects, such as a short to ground, a short to voltage or an open circuit. Which component sits on that driver depends on the model, engine and control module, so confirm it from the vehicle-specific wiring diagram.

Symptoms

  • Malfunction indicator lamp on
  • Possible loss of function of whatever the affected output controls, which varies by model
  • Rough running, hesitation or poor performance if the output is engine-related
  • Other stored codes for the same circuit or related actuators
  • Intermittent faults that come and go with vibration or temperature

Possible causes

  • Wiring fault on the affected driver circuit: chafed, shorted to ground or voltage, or open circuitlikely
  • Corroded, loose or pushed-out pins in the control module or load connectorlikely
  • Faulty actuator, solenoid or relay on that circuit with a shorted or open coillikely
  • Poor control module power supply or earth, or a blown fuse feeding the circuitpossible
  • Water ingress or heat damage to the harness or module connectorpossible
  • Internal fault in the control module output driverrare

How to diagnose

  1. Read all stored codes and freeze frame data to see the conditions when it set, and note any related codes
  2. Look up the vehicle-specific wiring diagram to identify which component and circuit Driver 4 Line 6 controls on this model and engine
  3. Check the relevant fuses and relays and inspect them for blown or burnt contacts
  4. Visually inspect the harness and connectors at the load and the control module for chafing, corrosion, water or bent pins
  5. Measure the resistance of the load component and compare it with the specification for that model
  6. Check supply voltage and earth at the load and at the control module with the circuit powered
  7. Command the output on and off with a scan tool's active test, if supported, and check that the circuit switches correctly with a meter or scope
  8. Check for service bulletins or a control module software update for the model, and only consider module replacement after wiring and load are proven good

How to fix

  • Repair or replace damaged wiring, and secure the harness away from heat and abrasion
  • Clean or repair corroded terminals and replace damaged connectors
  • Replace the faulty actuator, solenoid or relay once testing confirms it
  • Restore proper power and earth connections, and replace blown fuses only after finding the cause of the overload
  • Update the control module software if an outdated calibration is a documented cause for that model
  • Repair or replace the control module only when all external circuits test good and the driver fault is confirmed

Can I keep driving?

Medium severity

The car can usually be driven for a short time while you arrange diagnosis, but the effect depends on what the circuit controls. Stop driving if it runs badly, overheats, goes into limp mode or shows any safety warning.

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

This code for other makes

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