Code
C2304
Generic
C — Chassis
Chassis Control Module: CAN Bus Communication Fault
Views:
UK: 1
EN: 2
RU: 1
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in CAN_H or CAN_L wiring
- Corroded, loose or damaged connectors at the CCM or other nodes
- Missing or incorrect CAN termination resistors (open or shorted terminator)
- Short to battery or ground on CAN wires
- Low or intermittent battery voltage or poor ground(s) to CCM
- A module on the CAN bus repeatedly going bus‑off or flooding the bus
Symptoms
- Malfunction indicator or chassis/ABS/ESC warning lamps illuminated
- Loss of CCM‑controlled features (e.g., stability control, traction control, ABS functions)
- Diagnostic scanner cannot communicate with the CCM or shows intermittent responses
- CAN network related messages or warnings in the instrument cluster
- Erratic or non‑functional speedometer, braking assist, or related vehicle stability features
What to check
- Scan with a capable diagnostic tool; record C2304 plus any other U/C/P/C codes and freeze‑frame data
- Check for other modules reporting lost communication (note pattern of failures)
- Visually inspect CAN wiring harness, connectors and CCM connector for corrosion, tightness, damage or rodent chew
- Check battery voltage (stable ~12.6 V at rest, >= 11 V cranking) and main grounds to the CCM
- Backprobe CAN_H and CAN_L at the CCM connector and at other nodes to confirm presence and continuity
- Measure resistance across CAN_H and CAN_L with ignition off (expected ~60 Ω total with both terminators present)
Signal parameters
- CAN bus idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both lines near mid‑rail)
- CAN bus dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
- Expected DC resistance between CAN_H and CAN_L with both terminators present: ~60 Ω (two 120 Ω terminators in parallel)
- Common CAN bus speeds: 125 kbps, 250 kbps, 500 kbps (verify vehicle‑specific bit rate)
- Look for frequent bus errors, an abnormally low or high differential voltage, or a node repeatedly sending error frames
Diagnostic algorithm
- Connect a professional scan tool, read DTCs and freeze frame; note related U/C/P codes and time of occurrence.
- Inspect battery, main power and ground connections for the CCM; clean and tighten as needed.
- Visually inspect CCM connector and CAN wiring for damage, corrosion or pin push‑outs; repair any physical issues.
- With ignition on, backprobe CAN_H and CAN_L at the CCM and at another known good node to verify expected idle voltages and differential behavior.
- With ignition on, measure DC resistance across CAN_H and CAN_L with ignition off. Compare to ~60 Ω; open or short indicates wiring/terminator problems.
- Use a scope or CAN bus analyzer to monitor traffic for error frames, a stuck dominant state, or a node repeatedly going bus‑off. If a single node floods the bus, disconnect nodes one at a time to isolate.
- Disconnect any aftermarket modules or trailer harnesses and retest communication.
- Repair wiring/connector faults or replace failed terminators; retest. If wiring and termination are good, swap CCM with a known good unit only after verifying software/calibration compatibility.
- Clear codes, perform a road test while monitoring CAN traffic and DTCs to confirm repair. If intermittent, stress test (vibration, wiggle, temperature) to reproduce.
- If hardware checks pass, check for manufacturer software updates or TSBs and consider module reprogramming or replacement as final steps.
Likely causes
- Damaged wiring or connector at or near the CCM (most common)
- Bad or missing termination (open/shorted 120 Ω resistors) causing abnormal voltages
- Faulty CCM or another module repeatedly going bus‑off and preventing communication
- Intermittent battery/ground problem causing module resets and communication loss
- Aftermarket device or trailer harness improperly tied into the CAN bus
Fault status
Status
Chassis Control Module reports a CAN bus communication fault — communications to or from the CCM are intermittent or lost. Inspect CAN wiring, terminators, power/ground and other modules on the bus.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
C2304
HYUNDAI
C — Chassis
Rear Valve
Views:
UK: 12
EN: 21
RU: 15
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in CAN_H or CAN_L wiring
- Corroded, loose or damaged connectors at the CCM or other nodes
- Missing or incorrect CAN termination resistors (open or shorted terminator)
- Short to battery or ground on CAN wires
- Low or intermittent battery voltage or poor ground(s) to CCM
- A module on the CAN bus repeatedly going bus‑off or flooding the bus
Symptoms
- Malfunction indicator or chassis/ABS/ESC warning lamps illuminated
- Loss of CCM‑controlled features (e.g., stability control, traction control, ABS functions)
- Diagnostic scanner cannot communicate with the CCM or shows intermittent responses
- CAN network related messages or warnings in the instrument cluster
- Erratic or non‑functional speedometer, braking assist, or related vehicle stability features
What to check
- Scan with a capable diagnostic tool; record C2304 plus any other U/C/P/C codes and freeze‑frame data
- Check for other modules reporting lost communication (note pattern of failures)
- Visually inspect CAN wiring harness, connectors and CCM connector for corrosion, tightness, damage or rodent chew
- Check battery voltage (stable ~12.6 V at rest, >= 11 V cranking) and main grounds to the CCM
- Backprobe CAN_H and CAN_L at the CCM connector and at other nodes to confirm presence and continuity
- Measure resistance across CAN_H and CAN_L with ignition off (expected ~60 Ω total with both terminators present)
Signal parameters
- CAN bus idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both lines near mid‑rail)
- CAN bus dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
- Expected DC resistance between CAN_H and CAN_L with both terminators present: ~60 Ω (two 120 Ω terminators in parallel)
- Common CAN bus speeds: 125 kbps, 250 kbps, 500 kbps (verify vehicle‑specific bit rate)
- Look for frequent bus errors, an abnormally low or high differential voltage, or a node repeatedly sending error frames
Diagnostic algorithm
- Connect a professional scan tool, read DTCs and freeze frame; note related U/C/P codes and time of occurrence.
- Inspect battery, main power and ground connections for the CCM; clean and tighten as needed.
- Visually inspect CCM connector and CAN wiring for damage, corrosion or pin push‑outs; repair any physical issues.
- With ignition on, backprobe CAN_H and CAN_L at the CCM and at another known good node to verify expected idle voltages and differential behavior.
- With ignition on, measure DC resistance across CAN_H and CAN_L with ignition off. Compare to ~60 Ω; open or short indicates wiring/terminator problems.
- Use a scope or CAN bus analyzer to monitor traffic for error frames, a stuck dominant state, or a node repeatedly going bus‑off. If a single node floods the bus, disconnect nodes one at a time to isolate.
- Disconnect any aftermarket modules or trailer harnesses and retest communication.
- Repair wiring/connector faults or replace failed terminators; retest. If wiring and termination are good, swap CCM with a known good unit only after verifying software/calibration compatibility.
- Clear codes, perform a road test while monitoring CAN traffic and DTCs to confirm repair. If intermittent, stress test (vibration, wiggle, temperature) to reproduce.
- If hardware checks pass, check for manufacturer software updates or TSBs and consider module reprogramming or replacement as final steps.
Likely causes
- Damaged wiring or connector at or near the CCM (most common)
- Bad or missing termination (open/shorted 120 Ω resistors) causing abnormal voltages
- Faulty CCM or another module repeatedly going bus‑off and preventing communication
- Intermittent battery/ground problem causing module resets and communication loss
- Aftermarket device or trailer harness improperly tied into the CAN bus
Fault status
Status
Chassis Control Module reports a CAN bus communication fault — communications to or from the CCM are intermittent or lost. Inspect CAN wiring, terminators, power/ground and other modules on the bus.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
C2304
LAND ROVER
C — Chassis
Rear Left Wheel Speed Sensor Circuit — Intermittent/Invalid Signal
Views:
UK: 4
EN: 13
RU: 6
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in CAN_H or CAN_L wiring
- Corroded, loose or damaged connectors at the CCM or other nodes
- Missing or incorrect CAN termination resistors (open or shorted terminator)
- Short to battery or ground on CAN wires
- Low or intermittent battery voltage or poor ground(s) to CCM
- A module on the CAN bus repeatedly going bus‑off or flooding the bus
Symptoms
- Malfunction indicator or chassis/ABS/ESC warning lamps illuminated
- Loss of CCM‑controlled features (e.g., stability control, traction control, ABS functions)
- Diagnostic scanner cannot communicate with the CCM or shows intermittent responses
- CAN network related messages or warnings in the instrument cluster
- Erratic or non‑functional speedometer, braking assist, or related vehicle stability features
What to check
- Scan with a capable diagnostic tool; record C2304 plus any other U/C/P/C codes and freeze‑frame data
- Check for other modules reporting lost communication (note pattern of failures)
- Visually inspect CAN wiring harness, connectors and CCM connector for corrosion, tightness, damage or rodent chew
- Check battery voltage (stable ~12.6 V at rest, >= 11 V cranking) and main grounds to the CCM
- Backprobe CAN_H and CAN_L at the CCM connector and at other nodes to confirm presence and continuity
- Measure resistance across CAN_H and CAN_L with ignition off (expected ~60 Ω total with both terminators present)
Signal parameters
- CAN bus idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both lines near mid‑rail)
- CAN bus dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
- Expected DC resistance between CAN_H and CAN_L with both terminators present: ~60 Ω (two 120 Ω terminators in parallel)
- Common CAN bus speeds: 125 kbps, 250 kbps, 500 kbps (verify vehicle‑specific bit rate)
- Look for frequent bus errors, an abnormally low or high differential voltage, or a node repeatedly sending error frames
Diagnostic algorithm
- Connect a professional scan tool, read DTCs and freeze frame; note related U/C/P codes and time of occurrence.
- Inspect battery, main power and ground connections for the CCM; clean and tighten as needed.
- Visually inspect CCM connector and CAN wiring for damage, corrosion or pin push‑outs; repair any physical issues.
- With ignition on, backprobe CAN_H and CAN_L at the CCM and at another known good node to verify expected idle voltages and differential behavior.
- With ignition on, measure DC resistance across CAN_H and CAN_L with ignition off. Compare to ~60 Ω; open or short indicates wiring/terminator problems.
- Use a scope or CAN bus analyzer to monitor traffic for error frames, a stuck dominant state, or a node repeatedly going bus‑off. If a single node floods the bus, disconnect nodes one at a time to isolate.
- Disconnect any aftermarket modules or trailer harnesses and retest communication.
- Repair wiring/connector faults or replace failed terminators; retest. If wiring and termination are good, swap CCM with a known good unit only after verifying software/calibration compatibility.
- Clear codes, perform a road test while monitoring CAN traffic and DTCs to confirm repair. If intermittent, stress test (vibration, wiggle, temperature) to reproduce.
- If hardware checks pass, check for manufacturer software updates or TSBs and consider module reprogramming or replacement as final steps.
Likely causes
- Damaged wiring or connector at or near the CCM (most common)
- Bad or missing termination (open/shorted 120 Ω resistors) causing abnormal voltages
- Faulty CCM or another module repeatedly going bus‑off and preventing communication
- Intermittent battery/ground problem causing module resets and communication loss
- Aftermarket device or trailer harness improperly tied into the CAN bus
Fault status
Status
Chassis Control Module reports a CAN bus communication fault — communications to or from the CCM are intermittent or lost. Inspect CAN wiring, terminators, power/ground and other modules on the bus.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
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Was this AI description helpful?
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