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Home / DTC / C2008 — Chassis Control Module Communication Fault

C2008 — Chassis Control Module Communication Fault

Detailed page for trouble code C2008.

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C2008

Generic C — Chassis

Chassis Control Module Communication Fault

Brand: Generic
Type: C — Chassis
Views: UK: 2 EN: 2 RU: 0
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Page language: EN

Causes

  • Open or shorted wiring between CCM and vehicle data bus
  • Poor or missing power or ground to the CCM
  • Faulty CCM or internal failure
  • Missing or damaged CAN termination or bus wiring
  • Intermittent connector contact or corrosion
  • Other module causing bus errors or overwhelming the CAN bus

Symptoms

  • Chassis/ABS/traction/stability functions disabled or limited
  • Dash warning lamps: ABS, Traction Control, Stability, or general Chassis warnings
  • Messages such as “Service Chassis System” or “Communication Fault”
  • Loss of some networked features or inability to communicate with the CCM using a scan tool
  • Intermittent or permanent driveability or braking system faults depending on system architecture

What to check

  • Read all stored and pending DTCs on all modules — note U- and C-codes and freeze-frame data
  • Attempt to communicate with CCM using scan tool; verify module presence and response
  • Check battery voltage (engine off and cranking) and inspect fuses/relays supplying CCM
  • Visually inspect CCM connector for corrosion, bent pins, contamination, or water intrusion
  • Inspect CAN bus wiring harness for physical damage, chafing, or repairs
  • Measure CAN bus termination resistance (~60 ohms between CAN_H and CAN_L at key connectors)

Signal parameters

  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive)
  • CAN dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (typical)
  • Differential voltage when dominant ≈ 2.0 V
  • Termination resistance: ~60 ohms between CAN_H and CAN_L (two 120 Ω resistors in parallel)
  • Module supply voltage: battery voltage ~11–14 V with ignition on
  • Ground continuity: chassis ground to module should be low resistance (

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame, and ECU responses from all modules. Note related U-codes or repeated network errors.
  2. Attempt to communicate with the CCM using a known-good scan tool. Confirm whether the module responds, its serial number, and software version if available.
  3. Verify battery voltage and charging system; inspect and test fuses/relays that supply CCM power. Repair any supply issues.
  4. Visually inspect CCM connector and wiring. Disconnect connector and inspect pins for corrosion, bent pins, pushed-out terminals, or moisture. Re-seat connector.
  5. Check ground integrity: measure voltage drop between CCM ground and chassis while cranking and under load; repair poor grounds.
  6. Measure CAN_H and CAN_L at the CCM connector with a multimeter/oscilloscope. Confirm idle voltages (~2.5 V) and differential behavior when network active. Look for shorts to GND or B+.
  7. Measure termination resistance across CAN_H and CAN_L near network ends (~60 Ω). If incorrect, inspect for missing termination or additional unintended terminations.
  8. If the bus shows noise or errors, use an oscilloscope to capture frames and identify a noisy node. Disconnect suspect modules one at a time (if safe) to isolate the fault.
  9. Repair or replace damaged wiring, connectors, or terminals. After repairs, clear codes and test-drive to confirm fault does not return.
  10. If wiring and power/ground are good and the module still does not communicate, consider software update/reprogramming or replacement of the CCM and verify correct programming and configuration after replacement.

Likely causes

  • Blown fuse or low battery/poor battery connection to CCM
  • Loose, corroded or unplugged connector at CCM
  • Damaged CAN_H/CAN_L wiring or short to battery/ground
  • Failed CCM (internal electronic fault)
  • Fault on another module placing noise/errors on the CAN bus

Fault status

⚠️ Status
Chassis Control Module communication failure — module not responding or CAN bus messages missing/corrupted.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

C2000 C2001 C2002 U0100 U0073 U0121
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