Code
C0024
Generic
C — Chassis
Brake Pedal Feedback Pressure Solenoid Circuit
Views:
UK: 22
EN: 41
RU: 28
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the solenoid control circuit
- Poor or corroded connector or pin at the solenoid or module
- Failed pressure feedback solenoid (coil or internal electronics)
- Blown fuse or failed relay feeding the solenoid
- Faulty ABS/Brake Control Module driver output
- Water ingress or contamination at connector or solenoid
Symptoms
- ABS, BRAKE or traction control warning lamp illuminated
- Abnormal or inconsistent brake pedal feel (hard, soft, or pulsating)
- Loss of brake assist features or degraded braking response
- Vehicle may enter limp/limited braking mode
- Diagnostic trouble code stored and possibly other related codes
- Intermittent or permanent loss of feedback while braking
What to check
- Read and record freeze-frame and related codes with scan tool; note live data and PID for solenoid duty/command
- Visual inspection: check connectors, pins, wiring harness for damage, corrosion, water intrusion
- Verify fuses and relays feeding the solenoid and control module
- Backprobe the solenoid connector to measure supply voltage and control signal while commanding the solenoid with a scan tool
- Measure solenoid coil resistance with ohmmeter (with connector disconnected)
- Check ground continuity from solenoid ground to chassis and module ground
Signal parameters
- Supply voltage (key ON): ~11–14 V (vehicle battery voltage range)
- Control signal: typically PWM duty 0–100% when commanded; present on control pin when module activates solenoid
- PWM frequency (typical range): ~20–500 Hz (manufacturer-specific)
- Coil resistance (typical): commonly ~1–40 ohms — check vehicle-specific spec
- No continuity (open) or very low resistance to ground (short) indicates internal solenoid or wiring fault
Diagnostic algorithm
- Connect a scan tool, read C0024 and any related codes; note freeze-frame/live data and attempt to command the solenoid while observing PIDs.
- Perform a thorough visual inspection of the solenoid, connector, and harness for corrosion, damage, or water ingress.
- Verify power and ground: with connector disconnected, measure battery voltage at the power feed pin and continuity to ground on the ground pin.
- Measure coil resistance at the solenoid connector (power off). Compare to the vehicle specification. An open or shorted reading indicates a failed solenoid.
- Backprobe the control lead and command the solenoid via scan tool while observing voltage/waveform with a digital multimeter or scope to confirm PWM presence and duty change.
- If command signal is present and correct but solenoid doesn't respond or coil resistance is out of spec, replace the solenoid assembly and retest.
- If no control signal from module, inspect harness between module and solenoid for opens/shorts. Repair wiring as required and retest.
- If wiring and solenoid are good but no proper module output, suspect module driver fault or software issue; verify module power/ground and communications. Replace or reprogram module per manufacturer procedures if confirmed.
- Clear codes and perform road/functional test to ensure code does not return and pedal feedback is restored.
Likely causes
- Damaged harness or broken wire between module and solenoid
- Corroded/loose connector at solenoid
- Solenoid coil resistance out of specification (internal open/short)
- Fuse or power feed to solenoid circuit is open
- Module driver transistor failed and not switching the solenoid
- Control signal (PWM) missing or frozen due to module software/communication fault
Fault status
Status
Brake Pedal Feedback Pressure Solenoid circuit fault detected — open/short/poor connection or module driver error. Inspect wiring, connectors, power/ground and solenoid.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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