Cruise Control Output Circuit Malfunction (Chevrolet)
What does P1662 mean?
The P1662 code means the vehicle's onboard diagnostic system has detected: Cruise Control Output Circuit Malfunction (Chevrolet). This is a low severity code.
Common Symptoms
- Cruise control does not engage
- Cruise control indicator light not working
- Check Engine Light on
- Cruise control disengages unexpectedly
- No cruise control resume function
Probable Causes (Ranked by Likelihood)
- Faulty cruise control switch or stalk Very High
- Open or shorted wiring in cruise control circuit High
- Failed brake pedal position switch Moderate
- PCM cruise control driver failure Low
Step-by-Step Diagnostic Procedure
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Verify brake lights work properly since a faulty brake switch can disable cruise control.
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Use a scan tool to check cruise control switch inputs while pressing set, resume, and cancel.
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Inspect wiring between the cruise control switch and PCM for damage or corrosion.
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Test the cruise control servo or electronic throttle response when cruise is commanded on.
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Check for related brake pedal position sensor codes that may disable cruise control.
Frequently Asked Questions
Is it safe to drive without cruise control?
Yes. P1662 only affects the cruise control system. All other vehicle functions remain normal.
Why does my cruise control cut out on hills?
If the PCM detects abnormal output circuit behavior, it disables cruise as a safety measure. This is separate from normal cruise disengagement due to speed changes.
Could a blown fuse cause P1662?
Yes. Check the cruise control fuse in both the under-hood and interior fuse boxes before doing deeper diagnosis.