Code
U1010
HYUNDAI
U — Network/User
Low Voltage Detected
Views:
UK: 10
EN: 18
RU: 20
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor or corroded battery terminals or cable connections
- Charging system failure (faulty alternator or regulator)
- High parasitic drain or heavy accessory load
- Bad or missing ground/ground strap
- Blown fusible link, fuse, or damaged power distribution wiring
Symptoms
- Multiple modules show communication errors or go offline
- Illumination of battery/charging or multiple warning lights
- Dim or flickering interior/exterior lights
- Erratic gauges or infotainment resets
- No-crank or hard-start conditions if voltage drops during cranking
- Stored related communication or power-related DTCs
What to check
- Use a scan tool: read U1010 plus any stored/related codes and freeze frame data
- Measure battery resting voltage (key off) at battery terminals: ~12.6 V expected
- Measure cranking voltage at battery during crank (should typically stay above ~9–10 V)
- Measure charging voltage with engine running: 13.5–14.8 V expected
- Inspect and clean battery terminals, cable ends, and ground straps
- Perform a battery load test or check state of health (age/CCA)
Signal parameters
- Battery voltage at rest: nominal 12.4–12.8 V
- Cranking voltage: typically should not drop below ~9–10 V (manufacturer spec may vary)
- Charging system voltage (engine running): 13.5–14.8 V
- Parasitic draw (vehicle asleep): typically
- CAN bus recessive voltage (for reference): ~2.0–2.75 V per bus line (depends on network)
- Module supply pin voltage (key ON / engine RUN) — should match battery/charging as appropriate
Diagnostic algorithm
- Connect a professional scan tool and record U1010 freeze frame and all other stored codes.
- Visually inspect battery, terminals, battery tray and cable routing. Tighten/clean terminals as needed.
- Measure battery resting voltage at battery posts. If below ~12.4 V, charge battery and retest or perform battery load test; replace battery if failed.
- With engine running, measure charging voltage at battery. If outside 13.5–14.8 V, test alternator and regulator circuits and repair or replace as required.
- Perform a voltage drop test across positive and negative battery cables and major ground straps while cranking and under load; repair any high resistance connections.
- Check fuse boxes, fusible links and power distribution connectors for damage or high resistance; repair or replace defective components.
- If voltage tests are intermittent, connect a graphing DVOM/scope on the module supply circuit to capture transients; inspect harness for chafing or intermittent shorts.
- Check for parasitic current draw (measure current with all modules asleep). Isolate circuits by pulling fuses to find excessive draw and repair the offending circuit.
- Clear codes and re-run the vehicle to see if U1010 returns after repairs. If the code persists and power system checks normal, consider module supply circuitry or module replacement only after verifying wiring and power integrity.
- If required, check for available ECU software updates or service bulletins related to low-voltage detection before replacing modules.
Likely causes
- Battery resting voltage below ~12.4 V or failing battery under load
- Alternator not providing 13.5–14.8 V while engine running
- Loose/corroded battery terminal or ground reducing effective voltage
- Parasitic draw causing battery voltage to drop when parked or idling
- Damaged power feed or fusible link to the affected module
- Intermittent short or high-resistance connection in module supply circuit
Fault status
Status
U1010 — Low Voltage Detected. The vehicle detected an abnormally low supply voltage or unstable power that may affect module communication. Check battery, charging system, connections and wiring before replacing control modules.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
U1010
Other
U — Network/User
SCP (J1850) Invalid or Missing Data for Engine Air Intake
Views:
UK: 17
EN: 31
RU: 25
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor or corroded battery terminals or cable connections
- Charging system failure (faulty alternator or regulator)
- High parasitic drain or heavy accessory load
- Bad or missing ground/ground strap
- Blown fusible link, fuse, or damaged power distribution wiring
Symptoms
- Multiple modules show communication errors or go offline
- Illumination of battery/charging or multiple warning lights
- Dim or flickering interior/exterior lights
- Erratic gauges or infotainment resets
- No-crank or hard-start conditions if voltage drops during cranking
- Stored related communication or power-related DTCs
What to check
- Use a scan tool: read U1010 plus any stored/related codes and freeze frame data
- Measure battery resting voltage (key off) at battery terminals: ~12.6 V expected
- Measure cranking voltage at battery during crank (should typically stay above ~9–10 V)
- Measure charging voltage with engine running: 13.5–14.8 V expected
- Inspect and clean battery terminals, cable ends, and ground straps
- Perform a battery load test or check state of health (age/CCA)
Signal parameters
- Battery voltage at rest: nominal 12.4–12.8 V
- Cranking voltage: typically should not drop below ~9–10 V (manufacturer spec may vary)
- Charging system voltage (engine running): 13.5–14.8 V
- Parasitic draw (vehicle asleep): typically
- CAN bus recessive voltage (for reference): ~2.0–2.75 V per bus line (depends on network)
- Module supply pin voltage (key ON / engine RUN) — should match battery/charging as appropriate
Diagnostic algorithm
- Connect a professional scan tool and record U1010 freeze frame and all other stored codes.
- Visually inspect battery, terminals, battery tray and cable routing. Tighten/clean terminals as needed.
- Measure battery resting voltage at battery posts. If below ~12.4 V, charge battery and retest or perform battery load test; replace battery if failed.
- With engine running, measure charging voltage at battery. If outside 13.5–14.8 V, test alternator and regulator circuits and repair or replace as required.
- Perform a voltage drop test across positive and negative battery cables and major ground straps while cranking and under load; repair any high resistance connections.
- Check fuse boxes, fusible links and power distribution connectors for damage or high resistance; repair or replace defective components.
- If voltage tests are intermittent, connect a graphing DVOM/scope on the module supply circuit to capture transients; inspect harness for chafing or intermittent shorts.
- Check for parasitic current draw (measure current with all modules asleep). Isolate circuits by pulling fuses to find excessive draw and repair the offending circuit.
- Clear codes and re-run the vehicle to see if U1010 returns after repairs. If the code persists and power system checks normal, consider module supply circuitry or module replacement only after verifying wiring and power integrity.
- If required, check for available ECU software updates or service bulletins related to low-voltage detection before replacing modules.
Likely causes
- Battery resting voltage below ~12.4 V or failing battery under load
- Alternator not providing 13.5–14.8 V while engine running
- Loose/corroded battery terminal or ground reducing effective voltage
- Parasitic draw causing battery voltage to drop when parked or idling
- Damaged power feed or fusible link to the affected module
- Intermittent short or high-resistance connection in module supply circuit
Fault status
Status
U1010 — Low Voltage Detected. The vehicle detected an abnormally low supply voltage or unstable power that may affect module communication. Check battery, charging system, connections and wiring before replacing control modules.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
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Send to email