Code
C0800
HUMMER
C — Chassis
Device Power #1 Circuit Malfunction
Views:
UK: 13
EN: 31
RU: 17
AI status
Completed
Completed
100%
Causes
- Blown fuse or tripped circuit breaker
- Faulty power relay for Device Power #1
- Broken, corroded or disconnected wiring or connector (open circuit)
- Short to ground or short to battery voltage on the power feed
- Poor or corroded ground connection
- Failed load device (actuator/module) drawing excessive current
Symptoms
- Related system inoperative or intermittent (depends on what Device Power #1 feeds)
- Instrument panel warning/backlight or dedicated warning lamp illuminated
- Functional loss only when vehicle is vibrating or after engine bay heat — intermittent behavior
- Other DTCs set for the device or dependent systems
- Possible abnormal battery drain if stuck shorted
What to check
- Retrieve freeze frame and full scan-tool data; note any additional DTCs and time/date of occurrence
- Visually inspect wiring harnesses, connectors, fuses and relays for the Device Power #1 circuit for corrosion, damage or loose pins
- Verify battery voltage is good (12.4–12.8 V at rest, 13.5–14.8 V charging) before testing circuits
- Check/replace fuse(s) and inspect fuse holder for heat damage
- Test relay operation (listen for click, swap with known-good relay if possible)
- Backprobe power and ground pins at the affected device connector with key ON/engine OFF to verify presence and stability of voltage
Signal parameters
- Expected key ON, engine OFF: battery voltage at Device Power #1 feed (~12.0–14.5 V depending on state)
- Expected key OFF: ~0 V (no battery feed) on switched feeds unless constant feed circuit
- Ground continuity: low resistance to battery negative (
- Voltage drop under load: less than ~0.5 V from battery positive to device power terminal when device energized
- Current draw: depends on device; compare to specification or a known-good device (abnormal high current indicates short or failed device)
Diagnostic algorithm
- Connect a scan tool and record all stored/active codes and freeze-frame data. Note related modules and timestamps.
- Visually inspect fuse(s), relay(s) and connectors for Device Power #1. Replace any visibly damaged components and clear codes to retest.
- Verify battery/charging system health. Low supply voltage can cause circuit malfunction codes — correct if needed.
- With key ON (engine off), backprobe the device power terminal and measure voltage. If no voltage, trace upstream to fuse/relay/power source and test continuity to battery positive.
- If voltage present at fuse/relay but not at device, remove connectors and check for corroded pins, push/pull connectors fully seated, repair as needed.
- If voltage is present but intermittent, perform wiggle test along harness while watching voltage and scan data. Repair broken wires or protective loom damage.
- If voltage is low under load, measure voltage drop from battery positive to device and from device ground to battery negative; repair high-resistance connections or grounds.
- If wiring and power supply check good, disconnect the device and measure current draw at the circuit; compare to spec. If excessive, replace the device.
- If the wiring, power, device and grounds check OK, suspect control module output failure — consult service information, check module grounds/power and update/replace module only after confirming.
- After repairs, clear DTCs and perform functional test and road test as required to confirm fault does not return.
Likely causes
- Failed/dirty connector at device or module
- Blown fuse protecting the Device Power #1 feed
- Relay stuck open or contacts burned
- Wire chafed and shorting to chassis or another circuit
- High-resistance ground at mounting point
- Aftermarket accessory or prior repair damaged the harness
Fault status
Status
Device Power #1 Circuit Malfunction — the module detected abnormal voltage/current on the Device Power #1 feed (open, short, intermittent or excessive draw). Repair wiring, fuses, relays, grounds or replace failed device/module as required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
C0800
HYUNDAI
C — Chassis
Device Power #1(Low Current #1)Circuit Malfunction
Views:
UK: 10
EN: 28
RU: 14
AI status
Completed
Completed
100%
Causes
- Blown fuse or tripped circuit breaker
- Faulty power relay for Device Power #1
- Broken, corroded or disconnected wiring or connector (open circuit)
- Short to ground or short to battery voltage on the power feed
- Poor or corroded ground connection
- Failed load device (actuator/module) drawing excessive current
Symptoms
- Related system inoperative or intermittent (depends on what Device Power #1 feeds)
- Instrument panel warning/backlight or dedicated warning lamp illuminated
- Functional loss only when vehicle is vibrating or after engine bay heat — intermittent behavior
- Other DTCs set for the device or dependent systems
- Possible abnormal battery drain if stuck shorted
What to check
- Retrieve freeze frame and full scan-tool data; note any additional DTCs and time/date of occurrence
- Visually inspect wiring harnesses, connectors, fuses and relays for the Device Power #1 circuit for corrosion, damage or loose pins
- Verify battery voltage is good (12.4–12.8 V at rest, 13.5–14.8 V charging) before testing circuits
- Check/replace fuse(s) and inspect fuse holder for heat damage
- Test relay operation (listen for click, swap with known-good relay if possible)
- Backprobe power and ground pins at the affected device connector with key ON/engine OFF to verify presence and stability of voltage
Signal parameters
- Expected key ON, engine OFF: battery voltage at Device Power #1 feed (~12.0–14.5 V depending on state)
- Expected key OFF: ~0 V (no battery feed) on switched feeds unless constant feed circuit
- Ground continuity: low resistance to battery negative (
- Voltage drop under load: less than ~0.5 V from battery positive to device power terminal when device energized
- Current draw: depends on device; compare to specification or a known-good device (abnormal high current indicates short or failed device)
Diagnostic algorithm
- Connect a scan tool and record all stored/active codes and freeze-frame data. Note related modules and timestamps.
- Visually inspect fuse(s), relay(s) and connectors for Device Power #1. Replace any visibly damaged components and clear codes to retest.
- Verify battery/charging system health. Low supply voltage can cause circuit malfunction codes — correct if needed.
- With key ON (engine off), backprobe the device power terminal and measure voltage. If no voltage, trace upstream to fuse/relay/power source and test continuity to battery positive.
- If voltage present at fuse/relay but not at device, remove connectors and check for corroded pins, push/pull connectors fully seated, repair as needed.
- If voltage is present but intermittent, perform wiggle test along harness while watching voltage and scan data. Repair broken wires or protective loom damage.
- If voltage is low under load, measure voltage drop from battery positive to device and from device ground to battery negative; repair high-resistance connections or grounds.
- If wiring and power supply check good, disconnect the device and measure current draw at the circuit; compare to spec. If excessive, replace the device.
- If the wiring, power, device and grounds check OK, suspect control module output failure — consult service information, check module grounds/power and update/replace module only after confirming.
- After repairs, clear DTCs and perform functional test and road test as required to confirm fault does not return.
Likely causes
- Failed/dirty connector at device or module
- Blown fuse protecting the Device Power #1 feed
- Relay stuck open or contacts burned
- Wire chafed and shorting to chassis or another circuit
- High-resistance ground at mounting point
- Aftermarket accessory or prior repair damaged the harness
Fault status
Status
Device Power #1 Circuit Malfunction — the module detected abnormal voltage/current on the Device Power #1 feed (open, short, intermittent or excessive draw). Repair wiring, fuses, relays, grounds or replace failed device/module as required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
Your experience will help others
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Code
C0800
OPEL
C — Chassis
System Voltage Low Voltage
Views:
UK: 9
EN: 27
RU: 11
AI status
Completed
Completed
100%
Causes
- Blown fuse or tripped circuit breaker
- Faulty power relay for Device Power #1
- Broken, corroded or disconnected wiring or connector (open circuit)
- Short to ground or short to battery voltage on the power feed
- Poor or corroded ground connection
- Failed load device (actuator/module) drawing excessive current
Symptoms
- Related system inoperative or intermittent (depends on what Device Power #1 feeds)
- Instrument panel warning/backlight or dedicated warning lamp illuminated
- Functional loss only when vehicle is vibrating or after engine bay heat — intermittent behavior
- Other DTCs set for the device or dependent systems
- Possible abnormal battery drain if stuck shorted
What to check
- Retrieve freeze frame and full scan-tool data; note any additional DTCs and time/date of occurrence
- Visually inspect wiring harnesses, connectors, fuses and relays for the Device Power #1 circuit for corrosion, damage or loose pins
- Verify battery voltage is good (12.4–12.8 V at rest, 13.5–14.8 V charging) before testing circuits
- Check/replace fuse(s) and inspect fuse holder for heat damage
- Test relay operation (listen for click, swap with known-good relay if possible)
- Backprobe power and ground pins at the affected device connector with key ON/engine OFF to verify presence and stability of voltage
Signal parameters
- Expected key ON, engine OFF: battery voltage at Device Power #1 feed (~12.0–14.5 V depending on state)
- Expected key OFF: ~0 V (no battery feed) on switched feeds unless constant feed circuit
- Ground continuity: low resistance to battery negative (
- Voltage drop under load: less than ~0.5 V from battery positive to device power terminal when device energized
- Current draw: depends on device; compare to specification or a known-good device (abnormal high current indicates short or failed device)
Diagnostic algorithm
- Connect a scan tool and record all stored/active codes and freeze-frame data. Note related modules and timestamps.
- Visually inspect fuse(s), relay(s) and connectors for Device Power #1. Replace any visibly damaged components and clear codes to retest.
- Verify battery/charging system health. Low supply voltage can cause circuit malfunction codes — correct if needed.
- With key ON (engine off), backprobe the device power terminal and measure voltage. If no voltage, trace upstream to fuse/relay/power source and test continuity to battery positive.
- If voltage present at fuse/relay but not at device, remove connectors and check for corroded pins, push/pull connectors fully seated, repair as needed.
- If voltage is present but intermittent, perform wiggle test along harness while watching voltage and scan data. Repair broken wires or protective loom damage.
- If voltage is low under load, measure voltage drop from battery positive to device and from device ground to battery negative; repair high-resistance connections or grounds.
- If wiring and power supply check good, disconnect the device and measure current draw at the circuit; compare to spec. If excessive, replace the device.
- If the wiring, power, device and grounds check OK, suspect control module output failure — consult service information, check module grounds/power and update/replace module only after confirming.
- After repairs, clear DTCs and perform functional test and road test as required to confirm fault does not return.
Likely causes
- Failed/dirty connector at device or module
- Blown fuse protecting the Device Power #1 feed
- Relay stuck open or contacts burned
- Wire chafed and shorting to chassis or another circuit
- High-resistance ground at mounting point
- Aftermarket accessory or prior repair damaged the harness
Fault status
Status
Device Power #1 Circuit Malfunction — the module detected abnormal voltage/current on the Device Power #1 feed (open, short, intermittent or excessive draw). Repair wiring, fuses, relays, grounds or replace failed device/module as required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
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