Code
C1783
LAND ROVER
C — Chassis
Steering Angle Sensor Circuit — Signal Range/Performance
Views:
UK: 13
EN: 19
RU: 13
AI status
Completed
Completed
100%
Causes
- Faulty steering angle sensor (internal failure)
- Damaged wiring or chafed harness to the SAS (open, short to power/ground, intermittent)
- Poor connector contacts, corrosion or water ingress at sensor or module connectors
- Failed or faulty ABS/ESC/steering control module interpreting the signal
- Incorrect or missing SAS calibration/zeroing after steering work or sensor replacement
- Electromagnetic interference from nearby aftermarket equipment
Symptoms
- ABS, ESC or traction control warning lamp illuminated
- Steering/assistance or EPS warning lamp (on some models)
- Loss or reduction of stability control/traction control functions
- Steering wheel angle reading incorrect or does not change in scan tool live data
- Vehicle may exhibit poor stability or unexpected ABS/ESC intervention
- Stored and repeating C1783 fault; occasional reappearance after clearing
What to check
- Read live data with a factory or diagnostic scan tool: SAS angle value, vehicle speed, related ABS/ESC data and stored freeze frame
- Visually inspect connector and wiring at the steering angle sensor and steering column for damage, corrosion, or water ingress
- Check battery voltage and charging system (low voltage can cause false faults)
- Check for other related DTCs (ABS, yaw rate, wheel speed sensors) and address them first
- Backprobe the SAS connector to measure reference, signal and ground voltages with ignition ON (do not crank)
- Perform a wiggle test on the wiring while monitoring the live SAS signal for intermittent changes
Signal parameters
- Reference (Vref) typically ≈ 5.0 V (±0.25 V) with key ON
- Ground continuity to chassis ground should be near 0 Ω
- Signal voltage usually varies across rotation; center/straight-ahead commonly ≈ 2.5 V (approx mid-scale)
- Typical usable signal range ≈ 0.5 V to 4.5 V depending on sensor design; no abrupt drops to 0 V or full rail
- Signal should vary smoothly with steering wheel rotation and be stable (no excessive noise or jitter)
- If dual-channel SAS: both channels should track each other (no large disagreement)
Diagnostic algorithm
- Connect a diagnostic scanner, record C1783 and any other stored codes, note freeze-frame and live SAS angle values.
- Visually inspect the SAS connector and harness along the steering column for damage, corrosion or water entry. Repair as needed.
- With ignition ON (engine off), backprobe the SAS connector: verify Vref (~5V), good ground, and that the signal voltage is present and changes smoothly when the wheel is turned.
- Perform a wiggle test of the steering column wiring while observing live signal for intermittent faults. Repair any intermittent wiring or connector faults.
- If signal is out of range or absent, check continuity between the sensor connector and the ABS/ESC/steering module for open or shorted circuits. Repair wiring faults.
- If voltages and wiring check good but signal is implausible or noisy, replace the steering angle sensor and retest.
- After any repair or replacement, perform SAS calibration/initialization using the factory scan tool or approved procedure. Clear codes and retest on road to confirm proper operation.
- If fault persists after sensor replacement and wiring verified, inspect or replace the ABS/ESC/steering control module or check for CAN bus faults as appropriate.
Likely causes
- Loose/corroded connector at the steering angle sensor
- Broken conductor in harness in the steering column (common after steering work)
- Failed Hall-effect or potentiometer inside the SAS
- SAS not calibrated to center position after removal/installation
- Intermittent short to ground or to battery supply on the signal or reference circuit
Fault status
Status
Steering Angle Sensor signal out of expected range or performing outside expected parameters. ABS/ESC/steering module has set C1783 and may disable stability/assist functions until the fault is corrected and SAS is calibrated.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 39
LAND ROVER 2018 Discovery HSE Luxury, 3.0L Eng VIN K
HTML ManualLAND ROVER 2018 Discovery HSE Luxury, 3.0L Eng VIN V
HTML ManualLAND ROVER 2018 Discovery HSE, 3.0L Eng VIN K
HTML ManualLAND ROVER 2018 Discovery HSE, 3.0L Eng VIN V
HTML ManualLAND ROVER 2018 Discovery Sport HSE
HTML ManualLAND ROVER 2018 Discovery Sport HSE Luxury
HTML ManualLAND ROVER 2018 Discovery Sport SE
HTML ManualLAND ROVER 2018 Range Rover Autobiography
HTML ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email