C001F

Code

Generic C — Chassis

Chassis Control Module Communication Error

Brand: Generic

Type: C — Chassis

Views: UK: 5 EN: 3 RU: 3

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Page language: EN

Causes

Open or shorted CAN/communication wiring (CAN-H, CAN-L, or shield)
Loose, corroded or damaged module connector pins
Missing or low module supply voltage or poor ground
Faulty chassis control module (internal failure)
Bus termination resistor open or incorrect resistance
Faulty or incompatible module software (programming mismatch)

Symptoms

Chassis-related warnings or lamp illumination (ABS, ESC, traction control)
Loss or intermittent loss of stability/traction control functions
Vehicle diagnostic tool shows no response or intermittent responses from CCM
Stored communication-related DTC(s) and possible limp/limited functions
Unusual network activity or multiple modules reporting comms errors

What to check

Scan vehicle with a capable diagnostic tool; record all active and historic codes and freeze frame data
Verify whether other modules on the same network report communication faults
Visually inspect CCM connector(s) and wiring for damage, corrosion, bent pins or water ingress
Check module supply fuse(s), measure +12V (or battery voltage) at CCM with key ON, engine OFF
Measure CCM ground integrity (resistance to battery negative) and check for multiple ground points
Measure CAN bus voltages at the CCM connector with key ON: CAN_H, CAN_L, and differential

Signal parameters

CAN bus idle voltages (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
CAN bus dominant voltages: typical CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V)
Termination resistance: approximately 60 Ω measured between CAN_H and CAN_L (two 120 Ω terminators in parallel)
Common bus data rates: 250 kbps or 500 kbps (verify vehicle-specific rate with scan tool)
Expected message frequency: depends on vehicle and module (use OEM data or capture to compare)
Supply voltage at CCM: battery voltage with key ON (check for drop under load)

Diagnostic algorithm

Retrieve all DTCs and freeze frame data; note time and vehicle conditions when the code set.
Confirm code is current and whether it reappears after clearing; check for related codes on other modules.
Visually inspect CCM connector and nearby harness for damage, moisture, or corrosion; repair as needed.
Verify fuses and measure supply voltage and grounds at the CCM connector (key ON). Repair poor power/ground.
With ignition ON, measure CAN_H and CAN_L at the CCM connector and at another module on the same bus to compare.
Measure termination resistance between CAN_H and CAN_L with ignition OFF; expect ~60 Ω. Repair if open/incorrect.
Use a scan tool or CAN analyzer to view bus traffic: check for absence of CCM messages, bus errors, or a module flooding the bus.
Perform a wiggle test while monitoring voltages and bus traffic to find intermittent faults; isolate wiring sections as needed.
If wiring and power/ground are good and bus behavior is normal elsewhere, consider reflashing or replacing the CCM per manufacturer procedures.
After repairs or replacement, clear codes, re-run network scans, and road test to confirm the fault does not return. Obtain OEM-specific wiring diagrams and service information if uncertainty remains.

Likely causes

Damaged connector or pin(s) at the CCM
Open/short on CAN bus between CCM and gateway/ECM
Corroded ground or low supply power to the CCM
Failed CCM hardware or firmware requiring reflash or replacement
Missing/failed termination resistor or connector splice issue

Fault status

⚠️ Status

Chassis Control Module communication lost or interrupted on the vehicle network. The module did not receive expected network messages or did not respond when polled.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours

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