Code
C1254
HUMMER
C — Chassis
Abnormal Shutdown Detected
Views:
UK: 13
EN: 20
RU: 16
AI status
Completed
Completed
100%
Causes
- Low or dropped battery voltage
- Loose or corroded battery terminals or ground connections
- Blown fuse or faulty power/relay feeding the brake control module
- Intermittent power supply to the ABS/EBCM module
- Faulty ABS/EBCM module or internal software fault
- CAN-bus or module communication interruptions
Symptoms
- ABS warning lamp illuminated
- Traction control or stability lamp illuminated
- Loss of ABS and traction-control functionality
- Stored related ABS/communication codes in brake module and/or PCM
- Intermittent or permanent fault condition after key cycles
- Possible degradation of brake assist or anti-lock operation
What to check
- Scan for all stored codes in ABS/EBCM and powertrain modules; record freeze-frame data
- Check vehicle battery state-of-charge and charging system (battery voltage at rest and during cranking)
- Visually inspect battery terminals, main ground(s), and chassis/motor grounds for tightness and corrosion
- Verify fuses and relays that supply the ABS/EBCM are present and intact
- Inspect ABS/EBCM connectors and wiring for damage, corrosion, or water ingress
- Check CAN-bus/network for other modules reporting communication errors
Signal parameters
- Battery voltage (key on / cranking) — nominal 12.4–12.8 V (rest) and 13.5–14.8 V (engine running)
- ABS/EBCM module supply voltage at pin — should match battery, no intermittent drops
- Module ground resistance — low ohms to chassis (typically
- CAN high/low differential idle ~2.5 V each (2.5 V ±0.5) with ~1–2 V differential during activity
- Wheel speed sensor signals — present and within expected amplitude when rotating
- Pump motor current draw when commanded (if applicable)
Diagnostic algorithm
- Retrieve and record all DTCs and freeze-frame data from ABS/EBCM and powertrain modules. Note any communication U-codes.
- Clear codes and perform a key cycle and short test drive to see if C1254 returns and under what conditions.
- Check battery voltage and charging system; ensure battery terminals and main grounds are clean and tight. Repair as needed.
- Inspect fuses and relays supplying the ABS/EBCM. Substitute known-good relay if intermittent.
- Visually and electrically inspect the ABS/EBCM power and ground circuits at the module connector for loose pins, corrosion, or damaged wires. Wiggle-test wiring while monitoring supply voltage for intermittent loss.
- Monitor module supply voltage and CAN communication with a multimeter and preferably a lab scope while performing key-on and crank cycles to detect momentary drops or noise.
- Address any CAN-bus comms faults (loose connector, damaged wiring, termination issues). Repair wiring as required.
- If wiring and power are confirmed good, check for software updates or reflash/perform module reset per manufacturer service procedures.
- If abnormal shutdown persists and wiring/software verified, consider module replacement and follow programming/initialization procedures.
- After repairs, clear codes and road-test to confirm no recurrence. Re-scan all network modules for related codes.
Likely causes
- Weak or discharged battery or poor battery connections
- Intermittent main power/ground to ABS/EBCM (loose harness, corroded connector)
- Faulty ABS/EBCM module or failed internal component
- Faulty ignition switch or relay causing momentary loss of power
- CAN bus short or open causing module restart
Fault status
Status
C1254 — Abnormal Shutdown Detected: the brake/vehicle stability control module logged an unexpected shutdown or loss of power/communication. ABS/traction systems may be disabled until the cause is found and corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
C1254
HYUNDAI
C — Chassis
Rear Left(RL) Height Sensor High
Views:
UK: 14
EN: 20
RU: 18
AI status
Completed
Completed
100%
Causes
- Low or dropped battery voltage
- Loose or corroded battery terminals or ground connections
- Blown fuse or faulty power/relay feeding the brake control module
- Intermittent power supply to the ABS/EBCM module
- Faulty ABS/EBCM module or internal software fault
- CAN-bus or module communication interruptions
Symptoms
- ABS warning lamp illuminated
- Traction control or stability lamp illuminated
- Loss of ABS and traction-control functionality
- Stored related ABS/communication codes in brake module and/or PCM
- Intermittent or permanent fault condition after key cycles
- Possible degradation of brake assist or anti-lock operation
What to check
- Scan for all stored codes in ABS/EBCM and powertrain modules; record freeze-frame data
- Check vehicle battery state-of-charge and charging system (battery voltage at rest and during cranking)
- Visually inspect battery terminals, main ground(s), and chassis/motor grounds for tightness and corrosion
- Verify fuses and relays that supply the ABS/EBCM are present and intact
- Inspect ABS/EBCM connectors and wiring for damage, corrosion, or water ingress
- Check CAN-bus/network for other modules reporting communication errors
Signal parameters
- Battery voltage (key on / cranking) — nominal 12.4–12.8 V (rest) and 13.5–14.8 V (engine running)
- ABS/EBCM module supply voltage at pin — should match battery, no intermittent drops
- Module ground resistance — low ohms to chassis (typically
- CAN high/low differential idle ~2.5 V each (2.5 V ±0.5) with ~1–2 V differential during activity
- Wheel speed sensor signals — present and within expected amplitude when rotating
- Pump motor current draw when commanded (if applicable)
Diagnostic algorithm
- Retrieve and record all DTCs and freeze-frame data from ABS/EBCM and powertrain modules. Note any communication U-codes.
- Clear codes and perform a key cycle and short test drive to see if C1254 returns and under what conditions.
- Check battery voltage and charging system; ensure battery terminals and main grounds are clean and tight. Repair as needed.
- Inspect fuses and relays supplying the ABS/EBCM. Substitute known-good relay if intermittent.
- Visually and electrically inspect the ABS/EBCM power and ground circuits at the module connector for loose pins, corrosion, or damaged wires. Wiggle-test wiring while monitoring supply voltage for intermittent loss.
- Monitor module supply voltage and CAN communication with a multimeter and preferably a lab scope while performing key-on and crank cycles to detect momentary drops or noise.
- Address any CAN-bus comms faults (loose connector, damaged wiring, termination issues). Repair wiring as required.
- If wiring and power are confirmed good, check for software updates or reflash/perform module reset per manufacturer service procedures.
- If abnormal shutdown persists and wiring/software verified, consider module replacement and follow programming/initialization procedures.
- After repairs, clear codes and road-test to confirm no recurrence. Re-scan all network modules for related codes.
Likely causes
- Weak or discharged battery or poor battery connections
- Intermittent main power/ground to ABS/EBCM (loose harness, corroded connector)
- Faulty ABS/EBCM module or failed internal component
- Faulty ignition switch or relay causing momentary loss of power
- CAN bus short or open causing module restart
Fault status
Status
C1254 — Abnormal Shutdown Detected: the brake/vehicle stability control module logged an unexpected shutdown or loss of power/communication. ABS/traction systems may be disabled until the cause is found and corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
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Code
C1254
Other
C — Chassis
ABS Inlet Valve Coil RR Circuit Failure
Views:
UK: 19
EN: 28
RU: 26
AI status
Completed
Completed
100%
Causes
- Low or dropped battery voltage
- Loose or corroded battery terminals or ground connections
- Blown fuse or faulty power/relay feeding the brake control module
- Intermittent power supply to the ABS/EBCM module
- Faulty ABS/EBCM module or internal software fault
- CAN-bus or module communication interruptions
Symptoms
- ABS warning lamp illuminated
- Traction control or stability lamp illuminated
- Loss of ABS and traction-control functionality
- Stored related ABS/communication codes in brake module and/or PCM
- Intermittent or permanent fault condition after key cycles
- Possible degradation of brake assist or anti-lock operation
What to check
- Scan for all stored codes in ABS/EBCM and powertrain modules; record freeze-frame data
- Check vehicle battery state-of-charge and charging system (battery voltage at rest and during cranking)
- Visually inspect battery terminals, main ground(s), and chassis/motor grounds for tightness and corrosion
- Verify fuses and relays that supply the ABS/EBCM are present and intact
- Inspect ABS/EBCM connectors and wiring for damage, corrosion, or water ingress
- Check CAN-bus/network for other modules reporting communication errors
Signal parameters
- Battery voltage (key on / cranking) — nominal 12.4–12.8 V (rest) and 13.5–14.8 V (engine running)
- ABS/EBCM module supply voltage at pin — should match battery, no intermittent drops
- Module ground resistance — low ohms to chassis (typically
- CAN high/low differential idle ~2.5 V each (2.5 V ±0.5) with ~1–2 V differential during activity
- Wheel speed sensor signals — present and within expected amplitude when rotating
- Pump motor current draw when commanded (if applicable)
Diagnostic algorithm
- Retrieve and record all DTCs and freeze-frame data from ABS/EBCM and powertrain modules. Note any communication U-codes.
- Clear codes and perform a key cycle and short test drive to see if C1254 returns and under what conditions.
- Check battery voltage and charging system; ensure battery terminals and main grounds are clean and tight. Repair as needed.
- Inspect fuses and relays supplying the ABS/EBCM. Substitute known-good relay if intermittent.
- Visually and electrically inspect the ABS/EBCM power and ground circuits at the module connector for loose pins, corrosion, or damaged wires. Wiggle-test wiring while monitoring supply voltage for intermittent loss.
- Monitor module supply voltage and CAN communication with a multimeter and preferably a lab scope while performing key-on and crank cycles to detect momentary drops or noise.
- Address any CAN-bus comms faults (loose connector, damaged wiring, termination issues). Repair wiring as required.
- If wiring and power are confirmed good, check for software updates or reflash/perform module reset per manufacturer service procedures.
- If abnormal shutdown persists and wiring/software verified, consider module replacement and follow programming/initialization procedures.
- After repairs, clear codes and road-test to confirm no recurrence. Re-scan all network modules for related codes.
Likely causes
- Weak or discharged battery or poor battery connections
- Intermittent main power/ground to ABS/EBCM (loose harness, corroded connector)
- Faulty ABS/EBCM module or failed internal component
- Faulty ignition switch or relay causing momentary loss of power
- CAN bus short or open causing module restart
Fault status
Status
C1254 — Abnormal Shutdown Detected: the brake/vehicle stability control module logged an unexpected shutdown or loss of power/communication. ABS/traction systems may be disabled until the cause is found and corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email