Code
P1660
DAEWOO
P — Powertrain
Cruise crct fault
Views:
UK: 2
EN: 5
RU: 7
AI status
Completed
Completed
100%
Causes
- Blown fuse for cruise control or related circuits
- Open, shorted or corroded wiring / connectors in cruise control circuit
- Faulty brake switch or clutch switch (open when closed)
- Faulty cruise control switch / steering column controls
- Faulty cruise control module or engine control module (ECM/PCM)
- Loss of vehicle speed signal (VSS) or bad speed sensor
Symptoms
- Cruise control inoperative or will not set
- Cruise disable or fault message on dash
- Cruise may work intermittently
- No response from cruise control stalk/buttons
- Malfunction Indicator Lamp (MIL) may be illuminated in some cases
What to check
- Read and record freeze-frame and related codes with a scan tool
- Visual inspection: fuses, relays, connectors and wiring for damage/corrosion
- Verify battery and charging system voltage (12–14.5 V) under load
- Check operation and continuity of brake switch and clutch switch (where fitted)
- Check cruise control switches on the steering column for correct operation
- Monitor vehicle speed signal and related sensor data with a scan tool
Signal parameters
- Battery/terminal voltage: about 12–14.5 V with engine running
- Brake/clutch switch output: toggles between ~0 V and battery voltage when operated
- Cruise switch inputs: continuity or switch signal present when buttons pressed
- Vehicle speed sensor (VSS): pulse or 0–5 V square wave proportional to speed
- Throttle position sensor (TPS): steady 0.5–4.5 V depending on throttle position
- CAN bus: differential signals ~2.5 V idle; check for communication errors
Diagnostic algorithm
- Connect a quality scan tool and verify P1660 plus any related codes and freeze frame data.
- Inspect fuses and relays for the cruise control and ECM circuits; replace any blown fuses and retest.
- Visually inspect wiring and connectors for the cruise module, switches, brake and clutch switches; repair any damage or corrosion.
- Verify battery and charging system voltage; recharge or repair charging faults before further diagnosis.
- Test brake and clutch switches for correct operation and continuity; adjust or replace if out of tolerance.
- Operate cruise control switches while monitoring scan tool inputs to confirm switch signals reach the ECM/cruise module.
- Verify vehicle speed sensor output with a scope or scan tool; repair or replace VSS if missing or erratic.
- Check CAN/communication faults and repair wiring or connectors if communication errors are present.
- If wiring, switches and inputs are correct, test or substitute the cruise control module / ECM per manufacturer procedures.
- Clear codes and perform a road test to confirm repair; re-scan to ensure the code does not return.
Likely causes
- Bad or misadjusted brake/clutch switch preventing cruise enable
- Blown fuse or poor ground for cruise control circuit
- Open/short in cruise control switch wiring or connector
- Loss of vehicle speed input to cruise control/ECM
- Module internal failure or intermittent CAN communication
Fault status
Status
Cruise control circuit fault — system disabled. Check fuses, switches, wiring, vehicle speed input and module communication.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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