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Home / DTC / C2372 — Suspension Control Module Communication Fault

C2372 — Suspension Control Module Communication Fault

Detailed page for trouble code C2372.

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C2372

Generic C — Chassis

Suspension Control Module Communication Fault

Brand: Generic
Type: C — Chassis
Views: UK: 0 EN: 3 RU: 0
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Page language: EN

Causes

  • Faulty or intermittent wiring/connectors between SCM and CAN bus
  • Corroded or loose connector pins at the SCM
  • Blown fuse or lost ignition/switched power to SCM
  • Poor ground at the SCM or related modules
  • CAN bus short to battery or ground, or open circuit
  • Missing or incorrect termination resistor(s) on CAN bus

Symptoms

  • Suspension warning or service light illuminated on the dash
  • Reduced or disabled active suspension functions (ride height, damping)
  • Diagnostic trouble codes stored for SCM and related modules
  • Intermittent warnings or message alerts about communications
  • Vehicle may go into limp/safe mode for suspension system
  • Possible abnormal ride height or harsh/soft ride behavior

What to check

  • Read all stored DTCs and freeze frame data with a capable scan tool
  • Check for related network codes (U-codes) that indicate bus problems
  • Verify battery voltage (11–14.5 V) and charging system operation
  • Visually inspect SCM connector and wiring for corrosion, pins pushed out, or damage
  • Check fuses and power feeds to the SCM (ignition-switched and constant power)
  • Verify good chassis and module ground connections

Signal parameters

  • Vehicle battery voltage at SCM power input: nominal 11–14.5 V with ignition on
  • Module ground near 0 V (measure for low resistance to chassis ground)
  • CAN bus idle (recessive) voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
  • CAN bus dominant state (during message): CAN_H typically ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
  • Expected CAN bus baud rates commonly 250 kb/s or 500 kb/s depending on vehicle
  • Termination resistance across CAN_H and CAN_L ≈ 60 ohms (two 120 Ω terminators in parallel)

Diagnostic algorithm

  1. Connect a scan tool and read all current and pending DTCs and freeze frame data. Note related U-codes or multiple module faults.
  2. Attempt to communicate with SCM using OEM-level tool; record which modules respond and which do not.
  3. Verify battery voltage and good ignition-switched power to the SCM. Check fuses feeding the module and replace if blown.
  4. Inspect the SCM connector and harness for corrosion, bent pins, water intrusion, or physical damage. Repair or replace connector as required.
  5. Verify solid ground(s) for the SCM with resistance test to chassis ground. Clean and secure grounds if high resistance is found.
  6. Measure CAN_H and CAN_L DC voltages at the SCM connector with ignition ON and compare to expected values. If out of range, isolate wiring to find short/open.
  7. Check CAN bus continuity and termination resistance (expect ~60 Ω across CAN_H/CAN_L). Disconnect modules as needed to isolate a shorted device or shorted branch.
  8. Use an oscilloscope to view CAN bus waveforms while attempting communication to identify noise, missing messages, bus-off conditions, or corrupted frames.
  9. If wiring and network appear good, verify SCM software/calibration level and reflash/update per OEM service procedure. Clear codes and retest.
  10. If fault persists after verifying wiring, power/ground, and software, consider replacing the SCM following OEM replacement and programming procedures. Verify repair by rechecking network communications and clearing codes.

Likely causes

  • Loose or corroded connector at the suspension control module
  • CAN high/low wiring damaged or shorted
  • No power or bad ground at the SCM
  • Network termination resistor open or shorted causing bus errors
  • SCM software mismatch or failed module

Fault status

⚠️ Status
Suspension Control Module Communication Fault — module messages missing, corrupted, or bus errors detected between SCM and vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3 hours

Similar codes

C2371 C2373 U0073 U0100 U0121 U0001
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