C1288 — Steering Sensor Circuit Malfunction

Causes

• Open or shorted wiring to steering sensor
• Corroded, loose or damaged connector at the steering column or EPS module
• Failed steering angle/torque/position sensor
• Faulty clock spring (spiral cable) or steering wheel connector
• Poor power or ground to the sensor or EPS module
• Water intrusion or corrosion in connector/harness

Symptoms

• Steering assist reduced or lost (hard steering) or inconsistent assist
• Steering column/Service Steering or EPS warning lamp illuminated
• Electronic stability/ABS/TCS warnings or degraded functionality
• Steering angle readout incorrect or stored zero/incorrect offset
• DTC present and may be intermittent depending on vehicle movement or temperature

What to check

• Read DTCs and freeze frame data with a capable scan tool; note related codes and module time stamp
• Check for other related codes (ABS, ESC, U-codes) that may indicate comms issues
• Visually inspect steering column area, connectors, and wiring harness for damage, corrosion, or water intrusion
• Inspect clock spring/spiral cable and steering wheel connectors for wear or damage
• Verify fuses and power/ground to steering sensor and EPS module per wiring diagram
• Backprobe sensor connector and EPS module pins while turning wheel to observe signal behavior

Signal parameters

• Typical sensor circuits use: 5 V reference (or vehicle reference), ground, and one or more signal lines (analog voltage ~0.5–4.5 V) or digital/PWM outputs
• Some systems provide steering angle over CAN bus (message ID and update rate visible on diagnostic tool)
• Signal should be stable at center and change smoothly and linearly as the wheel is turned; watch for dropouts, spikes, or stuck values
• Resistance or continuity from sensor connector to EPS module ground/power pins should be within specification (consult service data)

Similar codes