Code
C168700
HYUNDAI
C — Chassis
CAN Time-Out MDPS
Views:
UK: 12
EN: 14
RU: 12
AI status
Completed
Completed
100%
Causes
- Open or short in CAN High/Low wiring to MDPS
- Intermittent or corroded connector at MDPS or junctions
- Faulty MDPS module or internal CAN transceiver failure
- Missing/incorrect termination resistor or damaged bus topology
- Low battery voltage or poor ground affecting MDPS or bus
- Software mismatch or corrupted module software/firmware
Symptoms
- Power steering warning lamp (EPS/MDPS) illuminated
- Reduced or lost power steering assist / heavy steering
- Steering-related fault messages on cluster or scan tool
- Related modules showing CAN communication faults or lamping
- Intermittent assist or assist lost under certain conditions
What to check
- Read all stored and pending DTCs with a capable scan tool; note freeze-frame and occurrence pattern
- Check battery voltage and main ground integrity (at rest and during cranking if required)
- Visually inspect MDPS connector and CAN wiring for corrosion, damage, or water intrusion
- Check for other modules reporting CAN bus errors (U-codes) on same bus
- Measure CAN High/Low voltages at MDPS connector with ignition ON
- Measure resistance across CAN_H and CAN_L with ignition OFF (termination check)
Signal parameters
- Recessive (idle) voltage: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each line)
- Dominant state voltages: CAN_H ≈ 3.5 V and CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
- Termination resistance across CAN_H and CAN_L (ign OFF): ≈ 60 ohms (two 120Ω in parallel)
- Expected MDPS message: periodic steering/assist status messages — typically repeated at a short interval (tens to hundreds of ms); code set when messages are not received within the module's timeout window
Diagnostic algorithm
- Connect OEM-capable scan tool, confirm C168700 and list any other CAN-related codes; record freeze-frame and occurrence count.
- Verify battery voltage (12.4–12.8 V nominal at rest). Recharge or replace battery if low and clear codes to retest.
- Inspect MDPS connector and wiring: disconnect, inspect pins for corrosion/bent pins, clean and secure connector.
- With ignition ON, measure CAN_H and CAN_L at the MDPS connector. Verify recessive voltages ~2.5 V and proper dominant transitions while steering/vehicle systems active (use scope if available).
- Check termination resistance across CAN pair with ignition OFF (~60 Ω). Investigate if open or out-of-spec.
- Monitor CAN traffic with a scan tool or scope. Confirm whether MDPS is transmitting messages and at what rate; if MDPS is silent while other modules communicate, suspect MDPS.
- Perform wiggle test on harness/junctions while monitoring CAN data and code status to find intermittent faults.
- Isolate by disconnecting non-essential nodes or removing suspected modules one at a time to identify a conflicting device.
- If wiring and bus health are good but MDPS shows no transmit, consider reflashing/updating MDPS software per manufacturer service bulletin, then retest.
- If MDPS still does not communicate and wiring/termination are verified OK, replace MDPS module and verify repair by clearing codes and confirming stable communication.
Likely causes
- Damaged or loose CAN connector at the MDPS unit
- Broken or shorted CAN wires (chafing, pinched harness)
- Failed MDPS CAN transceiver or internal electronics
- Faulty termination (open or double termination) on the CAN bus
- Vehicle battery voltage below ECU operating threshold during event
Fault status
Status
MDPS CAN time-out — MDPS did not receive/send expected CAN messages within the module timeout period.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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