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Home / DTC / C2423 — Chassis Control Module Communication Fault

C2423 — Chassis Control Module Communication Fault

Detailed page for trouble code C2423.

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C2423

Generic C — Chassis

Chassis Control Module Communication Fault

Brand: Generic
Type: C — Chassis
Views: UK: 5 EN: 5 RU: 6
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Page language: EN

Causes

  • Open or short in CAN/CAN-FD wiring between CCM and network
  • Loss of module supply voltage or ground
  • Poor or corroded connector/pin contact at CCM or network nodes
  • Missing or failed bus termination (resistor) or excessive network loading
  • Faulty Chassis Control Module (internal failure)
  • Conflicting device or improper replacement/module not programmed

Symptoms

  • Malfunction Indicator Lamp (MIL) or chassis system warning lamp illuminated
  • Loss or intermittent operation of ABS, traction control, or stability systems
  • Diagnostic scanner cannot communicate with CCM or shows no CAN frames from CCM
  • Multiple communication-related codes present in other modules
  • Vehicle may enter limp or degraded mode for affected systems

What to check

  • Record all active and pending DTCs and freeze frame data with a scan tool
  • Verify battery voltage and charge (engine off and cranking conditions)
  • Visually inspect CCM connectors and nearby harness for damage, corrosion, moisture
  • Check CCM power and ground circuits for proper voltage and continuity
  • Use scan tool to verify whether CCM appears on the network and whether it sends/receives messages
  • Measure CAN bus termination resistance (approx. 60 ohms between CAN_H and CAN_L with ignition OFF)

Signal parameters

  • CAN recessive: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (no dominant bits)
  • CAN dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (approx. 2.0 V differential)
  • Typical CAN baud rates: 250 kb/s or 500 kb/s (verify vehicle-specific rate)
  • Expected idle bus activity: regular CAN frames visible on oscilloscope/scan tool; CCM should transmit periodic frames when powered
  • Termination resistance: ~60 ohms across CAN_H and CAN_L (two 120-ohm terminators in parallel)

Diagnostic algorithm

  1. Connect a professional scan tool and read all modules. Note additional communication codes and freeze frame data.
  2. Verify vehicle battery condition and proper voltage at CCM power pin(s). Repair poor battery/charging condition before further testing.
  3. Visually inspect CCM connector and harness for corrosion, bent pins, water intrusion, or physical damage; repair as needed.
  4. With ignition ON, verify power and ground pins at CCM (voltage and good chassis/engine ground continuity).
  5. Check network presence: use the scan tool to see if CCM is present; if absent, back-probe CAN_H/CAN_L at CCM connector to confirm bus signals.
  6. Measure CAN bus termination resistance with ignition OFF; if missing or incorrect, trace and repair open/shorted terminators.
  7. Use an oscilloscope to observe CAN signals at multiple points (near CCM and gateway) looking for missing frames, excessive noise, or shorted lines.
  8. Isolate by disconnecting other nodes or recent aftermarket devices that share the same bus to see if communication is restored.
  9. If wiring and power/grounds test good and bus signals are valid but CCM does not communicate, consider module replacement or reprogramming per manufacturer procedures.
  10. After repairs, clear codes and perform test drive or functional verification; re-scan to confirm code does not return.

Likely causes

  • Bad ground or battery feed to CCM
  • Damaged CAN high/low wires near connectors or chassis harness
  • Corroded connector pins at CCM or gateway module
  • Failed CCM that will not transmit or receive messages
  • Aftermarket device or recent repair introduced wiring short/short to voltage

Fault status

⚠️ Status
Chassis Control Module communication fault — module not responding or messages invalid on vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

C2420 C2421 C2422 C2424 U0100 U0073
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