C0374 — General System Malfunction

Causes

• Intermittent or lost communication between ABS/ESC module and vehicle network (CAN)
• Low or intermittent supply voltage to the chassis control module
• Damaged or corroded connectors or wiring harness near chassis/ABS components
• Faulty ABS/ESC control module or internal electronic failure
• Related sensor failure (wheel speed sensors, yaw rate, lateral acceleration, steering angle)
• Blown fuse or poor ground connection

Symptoms

• ABS, traction control, or stability control warning lamp illuminated
• Reduced or disabled ABS/traction/stability functionality
• Possible stored additional ABS/ESC-related fault codes
• Vehicle behaves normally at low speed but ABS/ESC intervention may be unavailable
• Intermittent faults that may clear after ignition cycle or battery disconnect

What to check

• Read all stored and pending codes from ABS, body, and powertrain modules with a capable scan tool
• Check for Communication (U-codes) and note any related module communication faults
• Verify battery voltage at rest and during cranking; ensure stable 12–14.5 V supply
• Inspect fuses and relays for the ABS/ESC system
• Visually inspect wiring harnesses and connectors at ABS module, wheel sensors, and steering angle sensor for damage, corrosion, or loose terminals
• Check grounds for continuity and corrosion at control module ground points

Signal parameters

• Module supply voltage: typically ~9–16 V depending on vehicle operating condition
• Reference/logic voltage: module logic typically uses 5 V reference circuits
• CAN bus activity: differential CAN_H/CAN_L voltages ~2.5 V idle, active messages ~3.5 V/1.5 V respectively
• Wheel speed sensor: AC or variable reluctance pulses or digital tone-wheel signals; frequency increases with wheel speed
• Steering angle sensor: CAN or serial data message plus raw angle in degrees reported by module

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