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Home / DTC / C1768 — Position Sensor Supply Fault

C1768 — Position Sensor Supply Fault

Detailed page for trouble code C1768.

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C1768

HUMMER C — Chassis

Position Sensor Supply Fault

Brand: HUMMER
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or faulty power relay feeding the sensor
  • Open, short-to-ground, or short-to-battery in the sensor supply or ground circuit
  • Corroded or loose connector/pins at the sensor or control module
  • Damaged wiring harness (chafing, water intrusion)
  • Failed position sensor (internal short or open)
  • Faulty ABS/steering/BCM control module or poor module ground

Symptoms

  • MIL/ABS/traction warning lamp or other chassis warning illuminated
  • Loss or erratic position sensor data (steering angle, pedal position, etc.) in live data
  • Associated systems may operate incorrectly (stability control, cruise, transmission shift logic)
  • Intermittent or permanent drivability/handling warnings
  • Possible loss of communication with affected module

What to check

  • Retrieve freeze frame and full scan for related codes before clearing
  • Visually inspect sensor connector and wiring for damage, corrosion, or water entry
  • Check fuses and relays for circuits supplying the sensor
  • Check battery voltage and charging system (under load and key ON)
  • Backprobe sensor connector with key ON and measure supply voltage, signal and ground
  • Perform continuity/resistance check between sensor supply/ground and the module/power distribution

Signal parameters

  • Sensor supply voltage: typically 5.0 V reference or 12 V battery feed depending on sensor — expected stable within ±0.2–0.5 V with key ON
  • Sensor signal voltage (position output): commonly 0.5–4.5 V varying with position (if analog)
  • Ground circuit resistance: expected
  • Can/Serial communication: module messages present and stable if sensor data passes through bus
  • No significant voltage drop at connector under test load (battery voltage minus

Diagnostic algorithm

  1. Connect a professional scan tool; record C1768 and any related codes, freeze frame and live data.
  2. Visually inspect the position sensor connector and harness for damage, corrosion, moisture or pin deformation; repair or clean as needed.
  3. Check fuses and relays for the sensor supply circuit; replace any blown fuses and retest.
  4. With ignition ON (engine OFF), backprobe the sensor supply pin and verify expected reference voltage (5 V) or battery feed (≈12 V) per vehicle wiring. Note voltage stability while wigging harness.
  5. Check sensor ground continuity to chassis and module ground; repair any high-resistance paths.
  6. If supply is missing or out of range, trace wiring from sensor to power distribution and module: check for opens, short-to-power, and short-to-ground with an ohmmeter (power off) and perform connector pin resistance checks.
  7. If supply and ground are good at the sensor but code persists, disconnect the sensor and measure supply voltage with connector unplugged to determine if sensor is loading the circuit (indicating internal short).
  8. If the sensor fails these checks, replace the sensor and clear codes. Retest and verify absence of C1768 and correct live data behavior.
  9. If sensor replacement does not correct the issue and wiring checks good, suspect the control module or its power/ground/communication circuits; verify module supply and grounds and consider module replacement or reprogramming per manufacturer procedures.
  10. After repairs, clear codes and perform a road or functional test while monitoring live data to ensure the fault does not return.

Likely causes

  • Loose or corroded connector at the position sensor
  • Open or high-resistance supply/ground circuit to the sensor
  • Sensor internal failure (shorted regulator or open supply)
  • Blown fuse or failed power relay supplying the sensor
  • Intermittent wiring fault due to chafing or water ingress

Fault status

⚠️ Status
Control module detected an abnormal or missing supply to a position sensor. Code stored when sensor supply voltage is out of expected range, missing, or shows a short condition. Further inspection of sensor supply, ground, wiring, and the control module is required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1767 C1769 C0035 C0040 U0121 U0100
Repair manuals

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Code

C1768

LAND ROVER C — Chassis

Rear height sensor - circuit failure

Brand: LAND ROVER
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or faulty power relay feeding the sensor
  • Open, short-to-ground, or short-to-battery in the sensor supply or ground circuit
  • Corroded or loose connector/pins at the sensor or control module
  • Damaged wiring harness (chafing, water intrusion)
  • Failed position sensor (internal short or open)
  • Faulty ABS/steering/BCM control module or poor module ground

Symptoms

  • MIL/ABS/traction warning lamp or other chassis warning illuminated
  • Loss or erratic position sensor data (steering angle, pedal position, etc.) in live data
  • Associated systems may operate incorrectly (stability control, cruise, transmission shift logic)
  • Intermittent or permanent drivability/handling warnings
  • Possible loss of communication with affected module

What to check

  • Retrieve freeze frame and full scan for related codes before clearing
  • Visually inspect sensor connector and wiring for damage, corrosion, or water entry
  • Check fuses and relays for circuits supplying the sensor
  • Check battery voltage and charging system (under load and key ON)
  • Backprobe sensor connector with key ON and measure supply voltage, signal and ground
  • Perform continuity/resistance check between sensor supply/ground and the module/power distribution

Signal parameters

  • Sensor supply voltage: typically 5.0 V reference or 12 V battery feed depending on sensor — expected stable within ±0.2–0.5 V with key ON
  • Sensor signal voltage (position output): commonly 0.5–4.5 V varying with position (if analog)
  • Ground circuit resistance: expected
  • Can/Serial communication: module messages present and stable if sensor data passes through bus
  • No significant voltage drop at connector under test load (battery voltage minus

Diagnostic algorithm

  1. Connect a professional scan tool; record C1768 and any related codes, freeze frame and live data.
  2. Visually inspect the position sensor connector and harness for damage, corrosion, moisture or pin deformation; repair or clean as needed.
  3. Check fuses and relays for the sensor supply circuit; replace any blown fuses and retest.
  4. With ignition ON (engine OFF), backprobe the sensor supply pin and verify expected reference voltage (5 V) or battery feed (≈12 V) per vehicle wiring. Note voltage stability while wigging harness.
  5. Check sensor ground continuity to chassis and module ground; repair any high-resistance paths.
  6. If supply is missing or out of range, trace wiring from sensor to power distribution and module: check for opens, short-to-power, and short-to-ground with an ohmmeter (power off) and perform connector pin resistance checks.
  7. If supply and ground are good at the sensor but code persists, disconnect the sensor and measure supply voltage with connector unplugged to determine if sensor is loading the circuit (indicating internal short).
  8. If the sensor fails these checks, replace the sensor and clear codes. Retest and verify absence of C1768 and correct live data behavior.
  9. If sensor replacement does not correct the issue and wiring checks good, suspect the control module or its power/ground/communication circuits; verify module supply and grounds and consider module replacement or reprogramming per manufacturer procedures.
  10. After repairs, clear codes and perform a road or functional test while monitoring live data to ensure the fault does not return.

Likely causes

  • Loose or corroded connector at the position sensor
  • Open or high-resistance supply/ground circuit to the sensor
  • Sensor internal failure (shorted regulator or open supply)
  • Blown fuse or failed power relay supplying the sensor
  • Intermittent wiring fault due to chafing or water ingress

Fault status

⚠️ Status
Control module detected an abnormal or missing supply to a position sensor. Code stored when sensor supply voltage is out of expected range, missing, or shows a short condition. Further inspection of sensor supply, ground, wiring, and the control module is required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1767 C1769 C0035 C0040 U0121 U0100
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

C1768

Other C — Chassis

Air Suspension Rear Height Sensor Low Signal Circuit Short To Ground

Brand: Other
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or faulty power relay feeding the sensor
  • Open, short-to-ground, or short-to-battery in the sensor supply or ground circuit
  • Corroded or loose connector/pins at the sensor or control module
  • Damaged wiring harness (chafing, water intrusion)
  • Failed position sensor (internal short or open)
  • Faulty ABS/steering/BCM control module or poor module ground

Symptoms

  • MIL/ABS/traction warning lamp or other chassis warning illuminated
  • Loss or erratic position sensor data (steering angle, pedal position, etc.) in live data
  • Associated systems may operate incorrectly (stability control, cruise, transmission shift logic)
  • Intermittent or permanent drivability/handling warnings
  • Possible loss of communication with affected module

What to check

  • Retrieve freeze frame and full scan for related codes before clearing
  • Visually inspect sensor connector and wiring for damage, corrosion, or water entry
  • Check fuses and relays for circuits supplying the sensor
  • Check battery voltage and charging system (under load and key ON)
  • Backprobe sensor connector with key ON and measure supply voltage, signal and ground
  • Perform continuity/resistance check between sensor supply/ground and the module/power distribution

Signal parameters

  • Sensor supply voltage: typically 5.0 V reference or 12 V battery feed depending on sensor — expected stable within ±0.2–0.5 V with key ON
  • Sensor signal voltage (position output): commonly 0.5–4.5 V varying with position (if analog)
  • Ground circuit resistance: expected
  • Can/Serial communication: module messages present and stable if sensor data passes through bus
  • No significant voltage drop at connector under test load (battery voltage minus

Diagnostic algorithm

  1. Connect a professional scan tool; record C1768 and any related codes, freeze frame and live data.
  2. Visually inspect the position sensor connector and harness for damage, corrosion, moisture or pin deformation; repair or clean as needed.
  3. Check fuses and relays for the sensor supply circuit; replace any blown fuses and retest.
  4. With ignition ON (engine OFF), backprobe the sensor supply pin and verify expected reference voltage (5 V) or battery feed (≈12 V) per vehicle wiring. Note voltage stability while wigging harness.
  5. Check sensor ground continuity to chassis and module ground; repair any high-resistance paths.
  6. If supply is missing or out of range, trace wiring from sensor to power distribution and module: check for opens, short-to-power, and short-to-ground with an ohmmeter (power off) and perform connector pin resistance checks.
  7. If supply and ground are good at the sensor but code persists, disconnect the sensor and measure supply voltage with connector unplugged to determine if sensor is loading the circuit (indicating internal short).
  8. If the sensor fails these checks, replace the sensor and clear codes. Retest and verify absence of C1768 and correct live data behavior.
  9. If sensor replacement does not correct the issue and wiring checks good, suspect the control module or its power/ground/communication circuits; verify module supply and grounds and consider module replacement or reprogramming per manufacturer procedures.
  10. After repairs, clear codes and perform a road or functional test while monitoring live data to ensure the fault does not return.

Likely causes

  • Loose or corroded connector at the position sensor
  • Open or high-resistance supply/ground circuit to the sensor
  • Sensor internal failure (shorted regulator or open supply)
  • Blown fuse or failed power relay supplying the sensor
  • Intermittent wiring fault due to chafing or water ingress

Fault status

⚠️ Status
Control module detected an abnormal or missing supply to a position sensor. Code stored when sensor supply voltage is out of expected range, missing, or shows a short condition. Further inspection of sensor supply, ground, wiring, and the control module is required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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C1767 C1769 C0035 C0040 U0121 U0100
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