Code
C1289
LAND ROVER
C — Chassis
Failure in the input of the redundant/secondary transducer signal
Views:
UK: 13
EN: 14
RU: 14
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the sensor signal wiring
- Corroded, loose or water-damaged connector at the sensor or control module
- Failed secondary (redundant) transducer/sensor
- Faulty supply (reference) voltage or ground to the sensor
- Internal fault in the control module input circuit
- Software/calibration error or missing sensor coding
Symptoms
- Malfunction Indicator Lamp (MIL) or warning light for the affected system (ABS/ESP/steering/brake, etc.)
- Reduced or degraded function of the system using the transducer (eg. limited stability control or steering assist)
- Diagnostic Trouble Code C1289 stored (with possible related codes)
- Intermittent or permanent loss of the related system functionality
- Possible limp/reduced-performance mode depending on system
What to check
- Read all stored DTCs and freeze frame data with a capable scan tool; note related codes and events
- Visually inspect sensor and module connectors for corrosion, bent pins, moisture, and secure fit
- Inspect wiring harness along its routing for damage, chafing, pinches, or previous repairs
- Backprobe the sensor connector and check reference voltage and ground with ignition ON
- Measure signal voltage on both primary and secondary sensor outputs (compare channels)
- Wiggle test wiring and connectors while monitoring signal to find intermittent faults
Signal parameters
- Sensor reference supply typically ~5 V (verify exact value from vehicle wiring diagram)
- Sensor signal voltage normally within ~0.5–4.5 V depending on position; should be present on both redundant channels
- Low resistance ground connection (near 0 ohms to chassis ground)
- Continuity: sensor connector to ECU pin should read near 0 ohms (short harness length dependent)
- Both redundant channels should provide consistent, correlated signals (no large differences)
Diagnostic algorithm
- Connect a compatible scan tool, record C1289 and any related codes, and capture freeze-frame data.
- Clear the code and attempt to reproduce the fault with a road or functional test while monitoring live data for the primary and secondary transducer channels.
- Visually inspect sensor and module connectors and harness for damage, corrosion, or water ingress. Repair as required.
- Backprobe the sensor connector: verify reference voltage, ground, and the presence of a valid signal on both channels with ignition ON and during operation (oscilloscope recommended for dynamic signals).
- If one channel shows no signal or an out-of-range value, perform continuity and resistance checks from the sensor pins to the control module pins to isolate open/shorts.
- Wiggle the harness and connectors while monitoring signals to identify intermittent faults.
- If wiring and connections are good, swap to a known-good sensor (if available) or bench-test the suspect sensor per manufacturer procedure.
- If sensor is good, inspect and test the control module input circuits; consult wiring diagrams and consider module replacement only after confirming wiring and sensor integrity.
- Check for and apply any manufacturer software updates or calibration procedures. Reprogram/couple sensors if required.
- After repairs, clear codes and perform verification test/road test to confirm the fault does not return.
Likely causes
- Damaged or chafed wiring between sensor and ECU
- Corroded connector pins at the sensor or module
- Failed secondary sensor channel while primary channel still working
- Poor or missing 5 V (or other reference) supply or ground
- Intermittent connection caused by movement or moisture
Fault status
Status
Stored fault: Failure in input of redundant/secondary transducer signal. May illuminate warning lamp and cause reduced functionality of the related control system until the fault is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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