Code
C2331
Generic
C — Chassis
Chassis Control Module Communication Error
Views:
UK: 0
EN: 1
RU: 0
AI status
Completed
Completed
100%
Causes
- Intermittent or open wiring between CCM and vehicle data bus (CAN/LIN)
- Corroded, loose, or damaged connectors at CCM or intermediate junctions
- Failed CCM (internal electronics or firmware)
- Low or intermittent module supply voltage or poor ground
- Bus termination open or short (incorrect resistance across CAN high/low)
- Interference or short to battery/ignition circuits
Symptoms
- Illumination of chassis-related warning lamp(s) (ABS, traction, stability)
- Loss of certain chassis functions (ABS, traction control, stability assist)
- Intermittent or permanent communication warnings in the scan tool
- Multiple related modules showing network communication errors
- No data or garbled data from CCM on a diagnostic scanner
What to check
- Read and record all stored and pending DTCs and freeze frame data
- Check battery voltage and state of charge (perform a battery test if weak)
- Visually inspect CCM connector and harness for corrosion, bent pins, or damage
- Verify proper ignition and accessory power to the CCM (11–14 V with engine off/running as appropriate)
- Check ground continuity from CCM ground to chassis/battery negative
- Measure CAN bus termination resistance between CAN High and CAN Low (~60 Ω total for two 120 Ω terminators)
Signal parameters
- Module supply voltage: typically 11–14 V (verify with ignition ON/engine running as required)
- Ground continuity: near 0 Ω to chassis/battery negative (low milliohms to a few ohms max)
- CAN bus idle voltages: CAN_H ≈ 2.5 ± 0.5 V, CAN_L ≈ 2.5 ± 0.5 V (recessive state)
- CAN bus dominant state: CAN_H ≈ 3.5 ± 0.5 V, CAN_L ≈ 1.5 ± 0.5 V (differential ≈ 2.0 ± 0.5 V)
- Bus termination resistance: ~50–70 Ω measured across CAN_H and CAN_L with ignition off (two 120 Ω terminators in parallel ≈ 60 Ω)
- Message traffic: modules typically transmit periodic messages (frequency varies by function; expect any CCM messages to be present when scanning—complete absence is a fault)
Diagnostic algorithm
- Retrieve all DTCs from all control modules and note occurrence/freeze frame. Do not immediately clear codes.
- Reproduce the fault (key cycle, drive cycle) and observe when code sets and whether it is intermittent or permanent.
- Check battery voltage and health. Recharge or replace weak batteries before continuing diagnostics.
- Perform a visual inspection of the CCM connector and harness: look for corrosion, moisture, damaged insulation, or terminal pushouts.
- With connector attached, use a scan tool to monitor CCM messages. Note if any messages appear or if the module is silent.
- Verify power and ground at the CCM connector (with ignition ON and engine running as appropriate). Repair any open/low circuits.
- Measure CAN_H and CAN_L voltages at the CCM connector with key ON: compare to expected idle and dominant values. Wiggle wiring to check for intermittent faults while monitoring.
- With ignition off, measure resistance across CAN_H and CAN_L at a convenient splice or connector; expect ~50–70 Ω. If open or shorted, trace harness to find break or short.
- If bus voltages and termination are correct, disconnect other suspected modules one at a time (or isolate segments) to identify a node that causes bus problems when connected.
- If wiring and other modules check good, consider CCM internal fault. Verify correct software calibration and history of prior reprogramming. Reflash/update CCM if an update is available.
- If module replacement is required, program/configure the new CCM per manufacturer procedure. After repair, clear codes, perform a drive cycle, and confirm the fault does not return.
- Document findings and any parts replaced. If fault is intermittent and not reproducible after repair, advise monitoring or return if symptom recurs.
Likely causes
- Loose or corroded connector at the Chassis Control Module
- Open/short in CAN High or CAN Low wiring near the CCM
- Low battery or poor ground affecting CCM communications
- Faulty CCM or module gone bus-off due to another module fault
Fault status
Status
Chassis Control Module communication fault detected. CCM messages missing or invalid on vehicle network. Check power, ground, connectors, wiring and bus integrity. Replace or reprogram module only after verifying network and supply are good.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
C2331
HYUNDAI
C — Chassis
Rear Left(RL) Valve (Out) - Electrical.
Views:
UK: 22
EN: 24
RU: 18
AI status
Completed
Completed
100%
Causes
- Intermittent or open wiring between CCM and vehicle data bus (CAN/LIN)
- Corroded, loose, or damaged connectors at CCM or intermediate junctions
- Failed CCM (internal electronics or firmware)
- Low or intermittent module supply voltage or poor ground
- Bus termination open or short (incorrect resistance across CAN high/low)
- Interference or short to battery/ignition circuits
Symptoms
- Illumination of chassis-related warning lamp(s) (ABS, traction, stability)
- Loss of certain chassis functions (ABS, traction control, stability assist)
- Intermittent or permanent communication warnings in the scan tool
- Multiple related modules showing network communication errors
- No data or garbled data from CCM on a diagnostic scanner
What to check
- Read and record all stored and pending DTCs and freeze frame data
- Check battery voltage and state of charge (perform a battery test if weak)
- Visually inspect CCM connector and harness for corrosion, bent pins, or damage
- Verify proper ignition and accessory power to the CCM (11–14 V with engine off/running as appropriate)
- Check ground continuity from CCM ground to chassis/battery negative
- Measure CAN bus termination resistance between CAN High and CAN Low (~60 Ω total for two 120 Ω terminators)
Signal parameters
- Module supply voltage: typically 11–14 V (verify with ignition ON/engine running as required)
- Ground continuity: near 0 Ω to chassis/battery negative (low milliohms to a few ohms max)
- CAN bus idle voltages: CAN_H ≈ 2.5 ± 0.5 V, CAN_L ≈ 2.5 ± 0.5 V (recessive state)
- CAN bus dominant state: CAN_H ≈ 3.5 ± 0.5 V, CAN_L ≈ 1.5 ± 0.5 V (differential ≈ 2.0 ± 0.5 V)
- Bus termination resistance: ~50–70 Ω measured across CAN_H and CAN_L with ignition off (two 120 Ω terminators in parallel ≈ 60 Ω)
- Message traffic: modules typically transmit periodic messages (frequency varies by function; expect any CCM messages to be present when scanning—complete absence is a fault)
Diagnostic algorithm
- Retrieve all DTCs from all control modules and note occurrence/freeze frame. Do not immediately clear codes.
- Reproduce the fault (key cycle, drive cycle) and observe when code sets and whether it is intermittent or permanent.
- Check battery voltage and health. Recharge or replace weak batteries before continuing diagnostics.
- Perform a visual inspection of the CCM connector and harness: look for corrosion, moisture, damaged insulation, or terminal pushouts.
- With connector attached, use a scan tool to monitor CCM messages. Note if any messages appear or if the module is silent.
- Verify power and ground at the CCM connector (with ignition ON and engine running as appropriate). Repair any open/low circuits.
- Measure CAN_H and CAN_L voltages at the CCM connector with key ON: compare to expected idle and dominant values. Wiggle wiring to check for intermittent faults while monitoring.
- With ignition off, measure resistance across CAN_H and CAN_L at a convenient splice or connector; expect ~50–70 Ω. If open or shorted, trace harness to find break or short.
- If bus voltages and termination are correct, disconnect other suspected modules one at a time (or isolate segments) to identify a node that causes bus problems when connected.
- If wiring and other modules check good, consider CCM internal fault. Verify correct software calibration and history of prior reprogramming. Reflash/update CCM if an update is available.
- If module replacement is required, program/configure the new CCM per manufacturer procedure. After repair, clear codes, perform a drive cycle, and confirm the fault does not return.
- Document findings and any parts replaced. If fault is intermittent and not reproducible after repair, advise monitoring or return if symptom recurs.
Likely causes
- Loose or corroded connector at the Chassis Control Module
- Open/short in CAN High or CAN Low wiring near the CCM
- Low battery or poor ground affecting CCM communications
- Faulty CCM or module gone bus-off due to another module fault
Fault status
Status
Chassis Control Module communication fault detected. CCM messages missing or invalid on vehicle network. Check power, ground, connectors, wiring and bus integrity. Replace or reprogram module only after verifying network and supply are good.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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