C2507

Code

HYUNDAI C — Chassis

Chassis CAN Bus Communication Fault

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 13 EN: 16 RU: 13

AI status

Completed

ready

Completed 100%

Page language: EN

MIL or chassis-related warning lamps illuminated (ABS, ESC, VDC, etc.)
Intermittent or complete loss of communication with one or more modules on a scan tool
Erratic behavior of chassis systems (ABS, traction control, suspension)
No data or frozen values for affected modules in diagnostic tool
CAN bus errors recorded in other modules or multiple communication-related DTCs

Connect a diagnostic scan tool and confirm C2507 and any related U/C codes; record freeze frame data
Check battery voltage and charging system — ensure stable 12V supply during testing
Visually inspect CAN wiring harnesses, connectors, and module grounds for damage, corrosion, or water intrusion
Backprobe CAN_H and CAN_L at an accessible connector and measure idle voltages and resistance to identify opens/shorts
Measure resistance across CAN_H and CAN_L with ignition off to check termination (~60 ohms expected for two 120 ohm terminators in parallel)
Wiggle test wiring and connectors while monitoring the bus for changes or intermittent codes

Idle voltages: CAN_H ~2.5 V, CAN_L ~2.5 V (both lines near mid-supply when recessive)
Dominant state: CAN_H rises and CAN_L falls producing ~1.5–2.5 V differential (typical differential ~2 V when dominant)
Termination: ~60 ohms across CAN_H and CAN_L (two 120 ohm terminators in parallel)
Typical bus speed: high-speed chassis CAN often 500 kbps (confirm vehicle-specific rate before advanced tests)

Read and record C2507 plus any other communication DTCs and freeze frame data with a scan tool; note which modules are not responding
Check and restore battery voltage if low; repeat scan to see if codes persist
Perform a thorough visual inspection of CAN wiring, module connectors and grounds for damage or corrosion; repair any obvious issues
With ignition ON (engine off), backprobe CAN_H and CAN_L at a convenient connector; confirm idle voltages around mid-supply and resistance ~60 ohms across lines with key off
If voltages are abnormal, isolate sections of the bus by disconnecting modules one at a time (where serviceable) to identify which module or harness segment causes the fault
Perform wiggle tests on wiring and connectors while monitoring live data for communication loss or code set events
Use an oscilloscope to capture waveforms if intermittent or complex noise is present; analyze for missing recessive/dominant transitions, reflections, or excessive noise
Repair wiring, terminals, or replace faulty connector/module/transceiver as identified. Reinstall correct termination resistors if missing/defective
Clear codes, perform a road or function test to confirm the fault does not return and related systems operate normally
If fault persists after wiring checks and module isolation, consider module replacement following manufacturer procedures and re-test

Broken or chafed CAN_H or CAN_L conductor in main harness
Loose, corroded, or pushed-out connector pins at a chassis module (ABS, BCM, SRS, etc.)
Failed CAN transceiver inside a module (module reports bus errors)
Open or short to voltage/ground on CAN lines due to damaged wiring or aftermarket equipment
Missing or open termination resistor (expected ~60 ohms across CAN_H and CAN_L)

⚠️ Status

Chassis CAN Bus Communication Fault — communication errors detected on the chassis CAN network; messages are lost or corrupted between modules.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email