Code
C1633
HYUNDAI
C — Chassis
Torque Sensor Signal Fail-Main & Sub | Cluster Invalid Displayed Speed
Views:
UK: 8
EN: 14
RU: 12
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring/connectors between torque sensor and EPS / gateway
- Contaminated/corroded connectors or water ingress at sensor or EPS module
- Failed torque sensor (main and/or sub)
- Faulty EPS (Electric Power Steering) control module or instrument cluster
- Loss of CAN/bus communication or bad ground/power supply
- Software/configuration mismatch or missing calibration
Symptoms
- DTC C1633 stored
- Instrument cluster shows "invalid" or no vehicle speed
- EPS warning lamp or reduced/erratic steering assist
- Traction control / ESC warnings or degraded stability control
- Intermittent or permanent loss of speed-dependent functions
What to check
- Read all stored and pending codes from all modules (scan tool) and note freeze frame data
- Verify battery voltage is within normal range (11–14.5 V) during testing
- Inspect torque sensor and EPS module connectors for corrosion, damage, or water intrusion
- Visually inspect wiring harness along steering column for damage or pinching
- Check for CAN-bus communication errors and verify modules appear on the network
- Check related fuses and ground connections for the EPS and instrument cluster
Signal parameters
- Sensor reference supply typically 5 V (verify with service data)
- Torque sensor produces differential/analog outputs for main and sub channels; voltages usually vary with steering torque (expect mid-range idle voltage, change when turning)
- Vehicle electrical system nominal voltage 11–14.5 V
- CAN bus speed typically 250–500 kbps depending on vehicle; check for stable bus activity with scan tool
Diagnostic algorithm
- Connect a capable scan tool and record all DTCs from EPS, ABS, BCM and instrument cluster; note freeze frame.
- Verify battery voltage and perform a key-on CAN/communication check. Look for U codes or dropped modules.
- Visually inspect connectors and harness to the torque sensor and EPS module; repair any physical damage.
- With ignition ON, backprobe the torque sensor connector: confirm reference voltage (≈5 V), ground continuity, and that main and sub signal lines show expected voltages and change when applying steering torque. Check for shorts to ground or battery.
- Wiggle the harness and connectors while monitoring live data for intermittent signal changes or DTCs.
- Check instrument cluster and ABS/vehicle speed source signals—if cluster reports invalid speed, verify wheel speed sensors and ABS module communication as an alternate speed source.
- If wiring and power/grounds are good but signals are invalid, replace or bench-test the torque sensor per manufacturer procedure.
- If sensor replacement does not clear the issue, test or replace the EPS control module. Reprogram or update module software/calibration as required.
- After repairs, clear codes and perform a road test to confirm proper steering assist and vehicle speed display. Re-check for recurrence.
Likely causes
- Damaged sensor harness (chafing, pinched, rodent damage)
- Connector pins pushed out, bent, or corroded at torque sensor or EPS module
- Torque sensor internal failure producing no/invalid differential signals
- EPS module failure or intermittent power/ground
- CAN bus open/short or lost communication with cluster/ABS/BCM
Fault status
Status
Torque sensor signal failure (main & sub). Instrument cluster may display invalid vehicle speed. Inspect EPS sensor, wiring, connectors, CAN communication and associated modules.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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