Code
P0572
GWM
P — Powertrain
- Low indicator of cruise control switch A
Views:
UK: 21
EN: 26
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in cruise-control switch A circuit
- Corroded, loose or damaged connector at the cruise-control switch
- Failed cruise-control/brake/clutch switch (depending on vehicle design)
- Blown fuse or poor power/ground supply to the switch or control module
- Short to ground on the switch signal circuit
- Faulty body/engine control module input (rare)
Symptoms
- Cruise control will not engage or will disengage immediately
- Cruise control indicator light may blink or be disabled
- Malfunction Indicator Lamp (MIL) or warning light may be illuminated
- Intermittent cruise operation — works sometimes and fails other times
- Possible related driveability interlocks if the vehicle uses the same input for other systems
What to check
- Retrieve freeze-frame and readiness data with a scan tool; note related codes
- Visually inspect switch, connectors and wiring for corrosion, damage, or loose pins
- Check fuse(s) related to cruise control and associated power/ignition circuits
- Backprobe switch connector and measure voltages with ignition on while actuating switch
- Wiggle test wiring and connectors while monitoring live data to recreate the fault
- Inspect for recent repairs or accessories that could have disturbed the circuit
Signal parameters
- Typical digital switch signal: LOW ≈ 0–1 V (closed or pulled to ground), HIGH ≈ battery voltage (≈11–14 V) when released — consult vehicle service manual for exact thresholds
- Some systems use a 5 V reference input; expected signal will be near 0 V (low) or near 5 V (high) — verify reference before testing
- Closed switch continuity: near 0 Ω between signal and ground (or signal and reference depending on design) — check service manual
Diagnostic algorithm
- Connect a capable scan tool. Read and record codes, freeze-frame data and live inputs. Note if P0572 is stored with other related codes.
- Clear codes and attempt to re-create the fault under controlled test conditions (do not drive unsafely). Monitor the cruise switch input on live data while operating the switch.
- Perform a visual inspection of the switch, wiring harness, and connector for damage, corrosion, pin push-out, or intrusion points (door hinges, steering column, pedal area).
- Check fuses and power/ground supplies for the cruise-control circuit and any associated modules. Repair any open fuses or poor grounds.
- Backprobe the switch connector. With ignition ON, measure signal voltage and compare to expected values while operating the switch. Look for low/absent voltage or intermittent behavior.
- If low or no signal, check continuity between the switch signal pin and the module input pin; check for short to ground or open circuit. Repair wiring as needed.
- If wiring and connector are good but signal remains incorrect, bench-test or replace the cruise-control switch assembly and retest.
- If replacement switch and wiring are verified good but code persists, test module input pin for damage or refer to manufacturer diagnostic procedures for module-level faults.
- After repairs, clear codes and perform a road or functional test to confirm the fault no longer appears and cruise operates normally.
- Document repairs and advise if further module programming or calibration is required by the manufacturer.
Likely causes
- Failed cruise-control/brake switch A or internal contacts worn/stuck
- Corroded/damaged connector or terminal at the switch or control module
- Broken/open wire or poor pin contact on the signal or ground
Fault status
Status
P0572 — Cruise control switch A circuit low input detected; cruise system input below expected voltage. Cruise may be disabled.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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