Code
C2423
Generic
C — Chassis
Chassis Control Module Communication Fault
Views:
UK: 12
EN: 18
RU: 12
AI status
Completed
Completed
100%
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
- Connect a professional scan tool and read all modules. Note additional communication codes and freeze frame data.
- Verify vehicle battery condition and proper voltage at CCM power pin(s). Repair poor battery/charging condition before further testing.
- Visually inspect CCM connector and harness for corrosion, bent pins, water intrusion, or physical damage; repair as needed.
- With ignition ON, verify power and ground pins at CCM (voltage and good chassis/engine ground continuity).
- 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.
- Measure CAN bus termination resistance with ignition OFF; if missing or incorrect, trace and repair open/shorted terminators.
- Use an oscilloscope to observe CAN signals at multiple points (near CCM and gateway) looking for missing frames, excessive noise, or shorted lines.
- Isolate by disconnecting other nodes or recent aftermarket devices that share the same bus to see if communication is restored.
- 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.
- 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
Repair manuals
Brands with available manuals
2,905
The library contains 2,905 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
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