Code
C0810
Generic
C — Chassis
Chassis Control Module Internal Fault
AI status
Completed
Completed
100%
Causes
- Internal hardware failure (processor, memory, PCB components)
- Corrupted or failed firmware/software
- Intermittent or low power/ground to the CCM
- Water intrusion, corrosion, or physical damage to module or connectors
- CAN-bus communication errors or bus faults causing internal error handling
- Overheating or thermal stress
Symptoms
- CCM-related warning lamp(s) illuminated (ABS, traction, stability, or chassis warning)
- Loss or intermittent operation of ABS, traction control, or stability control
- Related communication codes (CAN/U-codes) present
- Inability to communicate with the CCM via scan tool or intermittent responses
- Stored freeze-frame or event counters showing internal errors
What to check
- Read all stored and pending DTCs (including U-codes) and note freeze-frame data
- Check for related codes (CAN bus, wheel sensors, other chassis modules)
- Perform visual inspection of CCM, mounting, and connectors for corrosion, water, or damage
- Measure battery voltage (key on) and check main fuses and CCM power feed fuses/relays
- Verify good ground at module (measure voltage drop to battery negative while cranking if applicable)
- Check CAN high/low signals at the module with a scope or multimeter for expected idle voltages and activity
Signal parameters
- CCM supply voltage (key on) — expected ~Battery voltage
- CCM ground continuity/resistance to battery negative
- CAN High/Low idle voltages (~2.5 V nominal) and differential activity during communication
- Module response to diagnostic request (alive/timeout)
- Watchdog reset/event counters in module data
- Internal temperature (if available) and error counters
Diagnostic algorithm
- Connect a professional scan tool and record all DTCs, freeze-frame, and module information (part number, software ID)
- Check vehicle battery state and measure module supply voltage and ground; restore proper power/ground if out of range
- Visually inspect module connector and wiring harness for corrosion, bent pins, or water; repair any damage and retest
- Check CAN-bus integrity: measure CAN High/Low idle voltages, check for shorts/opens, and verify proper bus termination
- Clear the code and perform a function/communication test; note whether the code returns immediately or after driving
- If power/ground and CAN are good, check for available software updates or reflash the CCM per manufacturer procedure
- If module software reflash/reprogram is unsuccessful or the module fails internal self-tests, follow OEM diagnostics for bench testing or controlled replacement
- If replacement is required, obtain correct replacement CCM with matching part and software, program/configure/calibrate per OEM instructions, then clear codes and road test to confirm repair
- If uncertainty remains, consult OEM service documentation or technical support; retain original module for further bench evaluation if needed
Likely causes
- Poor battery/ignition power or high resistance ground to CCM
- Corrupted module software or failed update/reflash
- CAN high/low short or open causing internal watchdog/timeouts
- Connector pin corrosion or damaged circuit board traces
- Failed internal components (voltage regulator, microcontroller, EEPROM)
Fault status
Status
Chassis Control Module reports an internal fault. Module may be in fail-safe mode or unresponsive; related chassis functions may be disabled.
Repair difficulty: Medium
Diagnostic time: 1.0-3.5 hours
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