C181900

Code

HYUNDAI C — Chassis

CAN Time-Out TPMS

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 15 EN: 17 RU: 16

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Page language: EN

Open, short or high resistance in CAN_H or CAN_L wiring or connectors
Faulty TPMS control module (internal failure)
Faulty gateway / BCM / instrument cluster or other module that relays TPMS messages
Missing or damaged CAN bus termination resistor(s)
Blown fuse or poor power/ground to TPMS module
Aftermarket electronics interfering with the CAN bus

Read all stored codes from all modules (scan tool) and record freeze-frame data
Check vehicle battery voltage and charge state (low voltage can cause comms faults)
Inspect fuses and relays related to TPMS and body CAN/BCM circuits
Visually inspect TPMS module connectors and wiring for damage, corrosion or loose pins
Check for aftermarket devices connected to the CAN or battery that might interfere
Measure CAN_H and CAN_L voltages at the TPMS module with key ON, engine OFF

CAN recessive state: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V)
CAN dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V)
Idle/termination: bus termination ≈ 58–62 ohms across CAN_H and CAN_L
Typical vehicle CAN data rates: 250 kbps or 500 kbps depending on network (verify vehicle spec)
No TPMS CAN frames received within manufacturer timeout period (module-specific)

Verify and document the code(s). Clear codes and see if C181900 returns. Note whether it’s permanent or intermittent.
Check vehicle battery voltage; charge if low and retest. Low voltage can cause communication timeouts.
Inspect TPMS module power and ground circuits: verify fuses, continuity to battery, and ground integrity.
Visually inspect connectors and wiring at the TPMS module, BCM/gateway, and instrument cluster for damage or corrosion.
With key ON, measure CAN_H and CAN_L at the TPMS module connector: confirm recessive/dominant voltages and look for shorts to Vbatt or ground.
Measure resistance between CAN_H and CAN_L with ignition off; confirm ~60 ohms. If open or extreme low, trace wiring/terminator.
Use a capable scan tool/oscilloscope to monitor CAN bus traffic while operating: confirm whether TPMS frames are present and whether other modules can communicate.
If a faulty node is suspected, disconnect modules one at a time (starting with recently added/serviced components) to see when the bus returns to normal — follow safe isolation procedures.
If wiring and bus integrity are good but TPMS module still times out, attempt a software update/reflash of TPMS/gateway/BCM per dealer procedures before module replacement.
Replace the TPMS control module only after verifying wiring, power/ground and bus integrity. After repair, clear codes and perform required relearn or initialization procedures.

⚠️ Status

TPMS control module has not received required CAN messages within the allowed timeout period — communication with TPMS is lost or intermittent.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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