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Home / DTC / C1114 — 5V Source Low Voltage. | 12V Sensor Power Fail

C1114 — 5V Source Low Voltage. | 12V Sensor Power Fail

Detailed page for trouble code C1114.

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C1114

HYUNDAI C — Chassis

5V Source Low Voltage. | 12V Sensor Power Fail

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

Causes

  • Blown or intermittent 5V reference fuse or 12V sensor power fuse
  • Open, short to ground, or short to battery on the 5V reference or 12V sensor power wiring
  • Poor or corroded ground connection(s) for the PCM/ECU or sensor ground
  • Faulty sensor(s) drawing excessive current (shorted sensor)
  • Faulty PCM/ECU internal 5V regulator or sensor power driver
  • Low battery voltage or weak/failed charging system

Symptoms

  • Illuminated ABS/ESC/traction or engine warning lamp (depending on affected system)
  • Intermittent or incorrect sensor readings (speed, pressure, position, etc.)
  • Driveability issues or limp mode when critical sensors are affected
  • Stored DTC(s) related to sensors that use the 5V reference or 12V supply

What to check

  • Retrieve freeze frame/live data and all stored codes; note related sensor values
  • Measure battery voltage (key off, key on, engine cranking) — should be ~12.6V at rest, >10V while cranking
  • Check charging system output (engine running) — typically 13.5–14.8V
  • Inspect and verify fuses and fusible links for 5V reference and 12V sensor power circuits
  • Visually inspect harnesses and connectors at the ECU and affected sensors for damage or corrosion
  • Backprobe the sensor harness: measure 5V reference and 12V sensor power at sensor connector with key ON

Signal parameters

  • 5V reference expected: ~4.8–5.2 V with key ON (no engine load)
  • 12V sensor power expected: battery voltage ~11–14.5 V with key ON/engine running
  • Ground continuity: ECU/sensor ground to chassis should be low resistance (typically
  • Voltage drop on power feeds: less than 0.5 V under normal load; excessive drop indicates wiring/connection issue

Diagnostic algorithm

  1. Record all related trouble codes and live data. Note which sensors report out-of-range values.
  2. Verify battery and charging system voltage. If battery/charging is low, correct before further diagnostics.
  3. Inspect relevant fuses (5V reference fuse, 12V sensor power fuse). Replace any blown fuses and retest. If fuse blows again, suspect short/overload.
  4. With key ON (engine off), measure the 5V reference and 12V sensor power at the affected sensor connector(s). If voltages are normal at the connector, suspect the sensor or wiring downstream.
  5. If the 5V or 12V is low at the sensor connector, trace wiring back toward the ECU: look for opens, shorts to ground/battery, high resistance connections, rubbed-through insulation, or water intrusion.
  6. Check ECU/sensor grounds: disconnect harness and measure resistance to chassis. Clean/tighten ground connections and recheck.
  7. Disconnect suspect sensor(s) and re-measure supply voltages. If voltages return to normal with sensor disconnected, suspect a shorted/failed sensor.
  8. Wiggle-test harnesses/connectors while monitoring voltage/live data to find intermittent faults.
  9. If wiring, connectors, and sensors check good and the feed voltages are still low at the ECU output, suspect internal ECU regulator or driver failure. Confirm with service manual pinouts and component tests before replacing ECU.
  10. After repair, clear codes, perform a key-on/engine start and road-test to verify the code does not return and system operates normally.

Likely causes

  • Blown fuse for the 5V reference or 12V sensor power circuit
  • Open or shorted wiring between the ECU and sensor(s)
  • Poor ground at the ECU or sensor ground point
  • Faulty ECU internal regulator (less common than wiring/fuse)

Fault status

⚠️ Status
Low voltage detected on the 5V reference or 12V sensor power circuit — check fuses, wiring, grounds, sensors and ECU power/regulator.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.7-2.0 hours

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371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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Code

C1114

LAND ROVER C — Chassis

Torque in roller shaft

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

Causes

  • Blown or intermittent 5V reference fuse or 12V sensor power fuse
  • Open, short to ground, or short to battery on the 5V reference or 12V sensor power wiring
  • Poor or corroded ground connection(s) for the PCM/ECU or sensor ground
  • Faulty sensor(s) drawing excessive current (shorted sensor)
  • Faulty PCM/ECU internal 5V regulator or sensor power driver
  • Low battery voltage or weak/failed charging system

Symptoms

  • Illuminated ABS/ESC/traction or engine warning lamp (depending on affected system)
  • Intermittent or incorrect sensor readings (speed, pressure, position, etc.)
  • Driveability issues or limp mode when critical sensors are affected
  • Stored DTC(s) related to sensors that use the 5V reference or 12V supply

What to check

  • Retrieve freeze frame/live data and all stored codes; note related sensor values
  • Measure battery voltage (key off, key on, engine cranking) — should be ~12.6V at rest, >10V while cranking
  • Check charging system output (engine running) — typically 13.5–14.8V
  • Inspect and verify fuses and fusible links for 5V reference and 12V sensor power circuits
  • Visually inspect harnesses and connectors at the ECU and affected sensors for damage or corrosion
  • Backprobe the sensor harness: measure 5V reference and 12V sensor power at sensor connector with key ON

Signal parameters

  • 5V reference expected: ~4.8–5.2 V with key ON (no engine load)
  • 12V sensor power expected: battery voltage ~11–14.5 V with key ON/engine running
  • Ground continuity: ECU/sensor ground to chassis should be low resistance (typically
  • Voltage drop on power feeds: less than 0.5 V under normal load; excessive drop indicates wiring/connection issue

Diagnostic algorithm

  1. Record all related trouble codes and live data. Note which sensors report out-of-range values.
  2. Verify battery and charging system voltage. If battery/charging is low, correct before further diagnostics.
  3. Inspect relevant fuses (5V reference fuse, 12V sensor power fuse). Replace any blown fuses and retest. If fuse blows again, suspect short/overload.
  4. With key ON (engine off), measure the 5V reference and 12V sensor power at the affected sensor connector(s). If voltages are normal at the connector, suspect the sensor or wiring downstream.
  5. If the 5V or 12V is low at the sensor connector, trace wiring back toward the ECU: look for opens, shorts to ground/battery, high resistance connections, rubbed-through insulation, or water intrusion.
  6. Check ECU/sensor grounds: disconnect harness and measure resistance to chassis. Clean/tighten ground connections and recheck.
  7. Disconnect suspect sensor(s) and re-measure supply voltages. If voltages return to normal with sensor disconnected, suspect a shorted/failed sensor.
  8. Wiggle-test harnesses/connectors while monitoring voltage/live data to find intermittent faults.
  9. If wiring, connectors, and sensors check good and the feed voltages are still low at the ECU output, suspect internal ECU regulator or driver failure. Confirm with service manual pinouts and component tests before replacing ECU.
  10. After repair, clear codes, perform a key-on/engine start and road-test to verify the code does not return and system operates normally.

Likely causes

  • Blown fuse for the 5V reference or 12V sensor power circuit
  • Open or shorted wiring between the ECU and sensor(s)
  • Poor ground at the ECU or sensor ground point
  • Faulty ECU internal regulator (less common than wiring/fuse)

Fault status

⚠️ Status
Low voltage detected on the 5V reference or 12V sensor power circuit — check fuses, wiring, grounds, sensors and ECU power/regulator.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.7-2.0 hours

Similar codes

P0562 P0563 P0627 P0628 C1201 C1115
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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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

C1114

Other C — Chassis

ABS Power Relay Output Short Circuit To Ground

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

Causes

  • Blown or intermittent 5V reference fuse or 12V sensor power fuse
  • Open, short to ground, or short to battery on the 5V reference or 12V sensor power wiring
  • Poor or corroded ground connection(s) for the PCM/ECU or sensor ground
  • Faulty sensor(s) drawing excessive current (shorted sensor)
  • Faulty PCM/ECU internal 5V regulator or sensor power driver
  • Low battery voltage or weak/failed charging system

Symptoms

  • Illuminated ABS/ESC/traction or engine warning lamp (depending on affected system)
  • Intermittent or incorrect sensor readings (speed, pressure, position, etc.)
  • Driveability issues or limp mode when critical sensors are affected
  • Stored DTC(s) related to sensors that use the 5V reference or 12V supply

What to check

  • Retrieve freeze frame/live data and all stored codes; note related sensor values
  • Measure battery voltage (key off, key on, engine cranking) — should be ~12.6V at rest, >10V while cranking
  • Check charging system output (engine running) — typically 13.5–14.8V
  • Inspect and verify fuses and fusible links for 5V reference and 12V sensor power circuits
  • Visually inspect harnesses and connectors at the ECU and affected sensors for damage or corrosion
  • Backprobe the sensor harness: measure 5V reference and 12V sensor power at sensor connector with key ON

Signal parameters

  • 5V reference expected: ~4.8–5.2 V with key ON (no engine load)
  • 12V sensor power expected: battery voltage ~11–14.5 V with key ON/engine running
  • Ground continuity: ECU/sensor ground to chassis should be low resistance (typically
  • Voltage drop on power feeds: less than 0.5 V under normal load; excessive drop indicates wiring/connection issue

Diagnostic algorithm

  1. Record all related trouble codes and live data. Note which sensors report out-of-range values.
  2. Verify battery and charging system voltage. If battery/charging is low, correct before further diagnostics.
  3. Inspect relevant fuses (5V reference fuse, 12V sensor power fuse). Replace any blown fuses and retest. If fuse blows again, suspect short/overload.
  4. With key ON (engine off), measure the 5V reference and 12V sensor power at the affected sensor connector(s). If voltages are normal at the connector, suspect the sensor or wiring downstream.
  5. If the 5V or 12V is low at the sensor connector, trace wiring back toward the ECU: look for opens, shorts to ground/battery, high resistance connections, rubbed-through insulation, or water intrusion.
  6. Check ECU/sensor grounds: disconnect harness and measure resistance to chassis. Clean/tighten ground connections and recheck.
  7. Disconnect suspect sensor(s) and re-measure supply voltages. If voltages return to normal with sensor disconnected, suspect a shorted/failed sensor.
  8. Wiggle-test harnesses/connectors while monitoring voltage/live data to find intermittent faults.
  9. If wiring, connectors, and sensors check good and the feed voltages are still low at the ECU output, suspect internal ECU regulator or driver failure. Confirm with service manual pinouts and component tests before replacing ECU.
  10. After repair, clear codes, perform a key-on/engine start and road-test to verify the code does not return and system operates normally.

Likely causes

  • Blown fuse for the 5V reference or 12V sensor power circuit
  • Open or shorted wiring between the ECU and sensor(s)
  • Poor ground at the ECU or sensor ground point
  • Faulty ECU internal regulator (less common than wiring/fuse)

Fault status

⚠️ Status
Low voltage detected on the 5V reference or 12V sensor power circuit — check fuses, wiring, grounds, sensors and ECU power/regulator.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.7-2.0 hours

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