Code
P1718
DAEWOO
P — Powertrain
Steering snsr -low input
Views:
UK: 1
EN: 3
RU: 4
AI status
Completed
Completed
100%
Causes
- Open or short in steering sensor signal wire
- Poor connector contact or corrosion at the sensor or PCM
- Blown sensor reference power or ground
- Failed steering torque/angle sensor
- Intermittent wiring damage (pinch, chafing)
- Faulty PCM or internal input circuit (less common)
Symptoms
- Steering assist abnormal or reduced (EPS/assist fault)
- Steering-related warning or malfunction indicator lamp
- Steering feel inconsistent, lag, or unexpected resistance
- Stored DTC(s) related to steering or stability systems
- Possible limp-home/limited functionality of EPS
What to check
- Read and record freeze frame and live data with a scan tool; note when code sets
- Visually inspect steering column harness, sensor connector and PCM connector for damage/corrosion
- Wiggle test wiring while monitoring live signal to see if fault is intermittent
- Verify sensor reference voltage and ground at connector with key ON (engine off)
- Measure signal voltage at sensor connector while rotating steering/wheeling to observe expected change
- Check continuity and resistance of signal, power and ground wires between sensor and PCM
Signal parameters
- Typical sensor reference (Vref) commonly 5 V (verify factory spec)
- Nominal sensor signal often centered near mid-supply (≈2.5 V) for angular/torque sensors (verify spec)
- Low input threshold: signal below ~0.5 V (or significantly below nominal) will set a low input DTC
- Sensor ground should be near 0 V; large voltage on ground indicates poor ground
- Signal should change smoothly with steering input; abrupt drop to near 0 V indicates fault
Diagnostic algorithm
- Connect a capable scan tool. Read and record DTCs, freeze frame and live data for the steering sensor. Note conditions when code set (key on, engine running, steering movement).
- Perform a visual inspection of the steering column wiring harness, sensor connector and PCM connector. Repair any obvious damage or corrosion.
- With ignition ON (engine off), backprobe the sensor connector. Verify reference voltage (Vref) and ground presence per factory spec. If Vref or ground missing, trace and repair circuit.
- With ignition ON, observe sensor signal voltage on backprobe. Slowly turn steering while watching signal — it should move smoothly within the expected range. If the signal stays very low or drops to near 0 V, suspect wiring or sensor.
- If wiring and connectors check OK, perform continuity/resistance checks between sensor terminals and PCM pins to confirm no open/short. Repair any wiring faults.
- If wiring, power and ground are good but signal remains low, substitute or bench-test the steering sensor per manufacturer's procedure. Replace the sensor if it fails tests.
- After repairs, clear codes and re-check. Drive or reproduce the original conditions to confirm the code does not return.
- If fault persists with known-good sensor and harness, consider PCM input circuit fault and refer to manufacturer guidance before replacing PCM.
Likely causes
- Corroded/loose connector at steering sensor
- Broken/frayed signal wire between sensor and PCM
- Sensor ground or reference voltage lost
- Failed steering sensor unit
Fault status
Status
PCM detected steering sensor signal at a lower voltage than allowable threshold. The fault is stored when the input remains below the expected range for the required number of drive cycles. Inspect sensor, wiring, connectors, power and ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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