C162587

Code

HYUNDAI C — Chassis

CAN Time-Out ABS/ESP | CAN Time-out ABS/ESC(ESP)

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 11 EN: 16 RU: 11

AI status

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Page language: EN

Causes

Intermittent or permanent open/short in CANH/CANL wiring
Corroded, loose, or damaged connectors at ABS/ESP module or other nodes
Faulty ABS/ESP control module (internal CAN transceiver failure)
Faulty or missing termination resistor or incorrect bus termination
Low or unstable battery/charging system voltage affecting module operation
Other module on the same CAN bus not responding or in bus-off state

Symptoms

ABS and/or ESP/ESC warning lamp illuminated
Loss of ABS, traction control, or stability assist functionality
Stored communication-related DTCs for ABS/ESP and possibly other modules
Intermittent faults that may come and go with vibration or temperature
Possible other systems showing communication errors (engine, cluster)

What to check

Read all stored DTCs and freeze frame data from ABS/ESP and network modules
Confirm battery voltage and charging system are within specification
Visually inspect ABS module connectors, wiring harness, and nearby chassis grounds
Check for recent wiring repairs or aftermarket devices connected to CAN
Use a scan tool to view CAN bus message traffic, module presence, and alive signals
Measure CANH/CANL resistance between two termination points (~60 ohms across H-L with power off)

Signal parameters

CAN High voltage (idle ~2.5 V, dominant ~3.5 V)
CAN Low voltage (idle ~2.5 V, dominant ~1.5 V)
Differential voltage during dominant state (~2.0 V)
Presence and frequency of ABS module message IDs / heartbeat messages
Number of error frames or bus-off counters reported by modules
Battery voltage at ABS module connector (key on, engine off and running)

Diagnostic algorithm

Retrieve and record all DTCs and freeze-frame data from ABS/ESP and other control modules. Note which modules report lost communication.
Verify battery voltage and charging system health. Recharge or test battery if low; retest after proper voltage is restored.
Visually inspect ABS module connector, pins, and wiring for corrosion, bent pins, pushed-out terminals, or water intrusion. Repair or reseat connectors as needed.
With ignition off, measure resistance across CANH and CANL at two known termination points (expected ~60 ohms). If open or much higher, inspect for broken wiring or missing termination resistor.
Use an oscilloscope or CAN bus analyzer with ignition on to observe CANH/CANL waveforms at the ABS module connector. Look for activity, correct voltages, dominant/recessive states, excessive noise, or missing message IDs (ABS heartbeat).
If CAN traffic is absent at ABS but present elsewhere, isolate wiring between ABS ECU and bus (inspect harness, junctions, and splice points). Perform wiggle test while monitoring communication.
Check for other modules in bus-off state or U-codes indicating a different control module is holding the bus off. Repair or replace the failing module if identified.
If wiring and bus integrity are confirmed and the ABS module still does not communicate, consider bench-testing or replacing the ABS/ESP control module. Reprogram or initialize replacement module per manufacturer procedure.
Clear DTCs and verify the fault does not return. Road test to confirm proper operation of ABS/ESP functions and stable CAN communication.

Likely causes

Damaged connector or pin fault at ABS/ESP control unit
Open or high-resistance CANH/CANL pair between ABS ECU and network
One end of the CAN termination (120 ohm) open or double-terminated
ABS module CAN transceiver failed (module not transmitting alive messages)
Loss of power or ground to ABS/ESP module preventing communication

Fault status

⚠️ Status

CAN Time-Out (ABS/ESP): The ABS/ESP control unit failed to receive required CAN messages within the expected time window. This indicates interrupted or missing communication on the vehicle CAN network. Inspect connectors, wiring, bus termination, power/ground, and related modules before considering ABS/ESP module replacement.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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