Driver 5 Line 6 Malfunction (Chevrolet)
What does P1683 mean?
The P1683 code means the vehicle's onboard diagnostic system has detected: Driver 5 Line 6 Malfunction (Chevrolet). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Specific PCM output device inoperative
- Intermittent electrical component failure
- Relay clicking without activation
- Erratic solenoid behavior
Probable Causes (Ranked by Likelihood)
- Internal PCM driver circuit failure Very High
- External circuit short to ground High
- Failed relay or solenoid drawing excessive current Moderate
- PCM connector corrosion from moisture Low
Step-by-Step Diagnostic Procedure
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Identify which output circuits are controlled by Driver 5 Line 6 from the service manual.
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Disconnect the suspect external load and clear the code. If the code does not return, the external component is faulty.
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Inspect PCM connectors for corrosion and water damage.
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Measure the resistance of each relay coil or solenoid on this circuit (should be within specification).
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If all external loads test normal, the PCM driver has failed internally.
Frequently Asked Questions
How do I find which circuit is affected?
You need the specific wiring diagram for your vehicle year and model. GM service manuals map each PCM output driver line to specific external components.
Can I disconnect the affected circuit and still drive?
It depends on what the circuit controls. If it controls a non-essential device like an indicator lamp, yes. If it controls a fuel injector or cooling fan, no.
What causes PCM output driver failures?
The most common causes are shorted external loads that draw excessive current, water intrusion into the PCM, and age-related semiconductor degradation.