Driver 5 Line 5 Malfunction (Chevrolet)
What does P1682 mean?
The P1682 code means the vehicle's onboard diagnostic system has detected: Driver 5 Line 5 Malfunction (Chevrolet). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- One or more PCM-controlled devices not functioning
- Intermittent accessory operation
- Cooling fan issues
- Fuel injector circuit problems
Probable Causes (Ranked by Likelihood)
- Internal PCM driver circuit failure Very High
- Shorted or overloaded external circuit High
- Corroded PCM connector pins Moderate
- Water damage to PCM from cowl leak Low
Step-by-Step Diagnostic Procedure
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Identify which output circuits are controlled by Driver 5 Line 5 using the vehicle service manual.
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Inspect each controlled circuit for shorts to ground or excessive current draw.
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Check PCM connector C2 for corrosion, bent pins, or signs of water intrusion.
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Measure resistance of each external load controlled by this driver line.
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If all external circuits test normal, the PCM internal driver has failed and needs replacement or repair.
Frequently Asked Questions
What does Driver 5 Line 5 control?
The specific circuits vary by vehicle model and year. Consult the GM service manual for your vehicle to identify which outputs are on this driver line.
Can water damage the PCM?
Yes. On many GM trucks, the PCM is located near the cowl where water can leak through a damaged seal. Moisture on the circuit board causes driver failures.
Is it worth repairing the PCM instead of replacing it?
Yes. Several companies specialize in GM PCM repair and can fix individual driver circuits for $150-$300, much less than a $500-$800 replacement.