Code
C1572
ALFA ROMEO
C — Chassis
Load valve actuation time very high
Views:
UK: 4
EN: 9
RU: 3
AI status
Completed
Completed
100%
Causes
- Faulty load/actuation valve (sticking, internal wear or contamination)
- Blocked or contaminated hydraulic passages or filter
- Poor electrical connection to valve (corroded connector, broken wire, poor pin contact)
- Open or high-resistance wiring in control/feedback circuit
- Low system voltage or weak battery affecting valve drive
- Faulty driver in ABS/ESP control module
Symptoms
- ABS/ESP warning lamp illuminated
- Traction control or stability messages displayed
- Altered brake pedal feel or delayed brake modulation during ABS events
- Poor traction control performance or unexpected intervention
- Diagnostic trouble code(s) stored; possible limp or reduced functionality of stability systems
What to check
- Read freeze frame and full DTC list with a scan tool; note operating conditions when fault set
- Check battery voltage and charging system; ensure voltage stable during actuator commands
- Visually inspect harness and connectors at the valve and control module for corrosion, damage, or loose pins
- Check hydraulic fluid level and condition; look for contamination or debris
- Use scan tool to command the valve and monitor response/time values and related sensors
- Measure resistance of valve solenoid and compare to manufacturer specification
Signal parameters
- Command voltage to valve: typically 0–12 V (solenoid drive), verify with vehicle spec
- Solenoid coil resistance: check against OEM spec (common range 5–50 ohm depending on valve)
- Actuation time: expected short response (milliseconds to a few hundred ms); C1572 indicates significantly higher
- Battery voltage during test: stable ~12–14.5 V; drops can affect actuation
- Scan-tool reported valve command vs feedback timing and pressure rise rate
Diagnostic algorithm
- Clear the code and reproduce: use a scan tool to clear DTCs, perform drive cycle or actuator command to see if code returns.
- Check electrical supply: verify battery voltage and ground at rest and during commanded actuation; check for voltage drop under load.
- Visual inspection: inspect valve connector and harness for corrosion, pinch, or broken wires; repair as needed.
- Measure solenoid resistance: disconnect connector and measure coil resistance; compare to spec. Replace valve if out of range.
- Command test: use the diagnostic tool to activate the valve while monitoring command signal and system response (pressure or feedback). Note actuation delay.
- Inspect hydraulic side: check fluid level/condition and any inline filters or screens; flush system if contaminated.
- Bench test or swap: if available, bench-test the valve or swap with a known-good valve to confirm operation.
- Module check: if valve and wiring good, inspect control module outputs (drive transistors) for proper switching; check for internal faults or update software if recommended.
- Repair and retest: repair/replace faulty components, clear codes and perform a full functional test including road test to confirm issue resolved.
Likely causes
- Contaminated or sticking valve (most common)
- Corroded connector or damaged wiring to the valve
- Low battery voltage or poor ground
- Failed valve solenoid or internal coil
- Faulty control module or driver electronics (less common)
Fault status
Status
Load valve actuation time very high — valve response slower than expected. Check valve, hydraulic path, electrical connections and control module.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
C1572
FIAT
C — Chassis
Load valve actuation time very high
Views:
UK: 5
EN: 8
RU: 2
AI status
Completed
Completed
100%
Causes
- Faulty load/actuation valve (sticking, internal wear or contamination)
- Blocked or contaminated hydraulic passages or filter
- Poor electrical connection to valve (corroded connector, broken wire, poor pin contact)
- Open or high-resistance wiring in control/feedback circuit
- Low system voltage or weak battery affecting valve drive
- Faulty driver in ABS/ESP control module
Symptoms
- ABS/ESP warning lamp illuminated
- Traction control or stability messages displayed
- Altered brake pedal feel or delayed brake modulation during ABS events
- Poor traction control performance or unexpected intervention
- Diagnostic trouble code(s) stored; possible limp or reduced functionality of stability systems
What to check
- Read freeze frame and full DTC list with a scan tool; note operating conditions when fault set
- Check battery voltage and charging system; ensure voltage stable during actuator commands
- Visually inspect harness and connectors at the valve and control module for corrosion, damage, or loose pins
- Check hydraulic fluid level and condition; look for contamination or debris
- Use scan tool to command the valve and monitor response/time values and related sensors
- Measure resistance of valve solenoid and compare to manufacturer specification
Signal parameters
- Command voltage to valve: typically 0–12 V (solenoid drive), verify with vehicle spec
- Solenoid coil resistance: check against OEM spec (common range 5–50 ohm depending on valve)
- Actuation time: expected short response (milliseconds to a few hundred ms); C1572 indicates significantly higher
- Battery voltage during test: stable ~12–14.5 V; drops can affect actuation
- Scan-tool reported valve command vs feedback timing and pressure rise rate
Diagnostic algorithm
- Clear the code and reproduce: use a scan tool to clear DTCs, perform drive cycle or actuator command to see if code returns.
- Check electrical supply: verify battery voltage and ground at rest and during commanded actuation; check for voltage drop under load.
- Visual inspection: inspect valve connector and harness for corrosion, pinch, or broken wires; repair as needed.
- Measure solenoid resistance: disconnect connector and measure coil resistance; compare to spec. Replace valve if out of range.
- Command test: use the diagnostic tool to activate the valve while monitoring command signal and system response (pressure or feedback). Note actuation delay.
- Inspect hydraulic side: check fluid level/condition and any inline filters or screens; flush system if contaminated.
- Bench test or swap: if available, bench-test the valve or swap with a known-good valve to confirm operation.
- Module check: if valve and wiring good, inspect control module outputs (drive transistors) for proper switching; check for internal faults or update software if recommended.
- Repair and retest: repair/replace faulty components, clear codes and perform a full functional test including road test to confirm issue resolved.
Likely causes
- Contaminated or sticking valve (most common)
- Corroded connector or damaged wiring to the valve
- Low battery voltage or poor ground
- Failed valve solenoid or internal coil
- Faulty control module or driver electronics (less common)
Fault status
Status
Load valve actuation time very high — valve response slower than expected. Check valve, hydraulic path, electrical connections and control module.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email