Code
C1255
HUMMER
C — Chassis
EBCM Internal Malfunction
Views:
UK: 19
EN: 32
RU: 20
AI status
Completed
Completed
100%
Causes
- Internal EBCM hardware failure (processor, memory, PCB components)
- Corrupted or failed EBCM software/firmware
- Intermittent or low power supply to EBCM (battery/charging/ignition circuit)
- Poor or corroded ground or connector damage at the EBCM
- Water intrusion or physical damage to module or connector
- Severe CAN bus or communication errors affecting the EBCM
Symptoms
- ABS warning lamp ON
- Traction control/ESC warning lamp ON or disabled
- Loss of ABS and traction control functions (longer stopping distances under ABS events)
- Stored or intermittent ABS/EBCM diagnostic trouble codes
- Possible warning chimes or reduced vehicle stability assistance
What to check
- Read all stored and pending codes and freeze frame with a capable scan tool
- Confirm battery voltage and charging system (measure with engine off and running)
- Inspect EBCM connector for corrosion, bent pins, water intrusion and secure fit
- Check ABS/EBM-related fuses and relays
- Verify good chassis and battery ground connections, especially near module
- Check CAN bus communication to EBCM (loss-of-communication codes, bus voltage)
Signal parameters
- Battery supply voltage to EBCM: ~11–15 V (key on, engine running ≈12–14.8 V)
- EBCM ground continuity: near 0 Ω to chassis
- CAN high/low differential: approx. 2.5 V idle, ± differential ~1 V (varies by vehicle) — verify communications present
- Wheel speed sensor signals: AC or digital pulses proportional to wheel speed (should be present and consistent across wheels during wheel rotation)
- Pump motor current draw: should match factory spec during pump operation (excessive or no current indicates pump or control fault)
Diagnostic algorithm
- Connect a professional scan tool that supports ABS/EBCM, record all codes and freeze frame data.
- Confirm if C1255 is current or historic; clear codes and attempt a test drive to reproduce.
- Measure battery voltage at the EBCM connector with key on/engine running; verify within acceptable range.
- Inspect and secure power and ground wires at EBCM; clean corrosion and reseal connectors if needed.
- Check fuses/relays for ABS/EBCM circuits; test/replace if faulty.
- Use scan tool to check for CAN bus communication and other communication-related trouble codes (U-codes).
- Monitor live data: wheel speed sensors, pump request/status, and any internal EBCM status messages.
- Perform wiggle tests of wiring harness while monitoring live data to reveal intermittent faults.
- If power/ground/communication and sensors are good, check for available software updates/TSBs and attempt module reflash/reprogram per manufacturer procedure.
- If internal module fault persists after all external causes are ruled out and reflashing fails, replace EBCM and perform required relearns and programming.
- After repair or replacement, clear codes and perform a full road test to confirm ABS/EBCM functionality and ensure no related codes return.
Likely causes
- Bad ground or low battery voltage to EBCM
- Corroded/wet connector at the EBCM
- Module internal component failure
- Software corruption needing reflash/reprogram
- CAN bus wiring fault or another module putting bus into error
Fault status
Status
The EBCM has detected an internal malfunction. ABS and traction control features may be disabled. Inspect power, ground, connectors and communications; module reflash or replacement may be required.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
69
Browse 69 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
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Code
C1255
HYUNDAI
C — Chassis
Rear Right(RR) Height Sensor | Height Sensor - Rear Right | Height Sensor Range Over
Views:
UK: 25
EN: 35
RU: 23
AI status
Completed
Completed
100%
Causes
- Internal EBCM hardware failure (processor, memory, PCB components)
- Corrupted or failed EBCM software/firmware
- Intermittent or low power supply to EBCM (battery/charging/ignition circuit)
- Poor or corroded ground or connector damage at the EBCM
- Water intrusion or physical damage to module or connector
- Severe CAN bus or communication errors affecting the EBCM
Symptoms
- ABS warning lamp ON
- Traction control/ESC warning lamp ON or disabled
- Loss of ABS and traction control functions (longer stopping distances under ABS events)
- Stored or intermittent ABS/EBCM diagnostic trouble codes
- Possible warning chimes or reduced vehicle stability assistance
What to check
- Read all stored and pending codes and freeze frame with a capable scan tool
- Confirm battery voltage and charging system (measure with engine off and running)
- Inspect EBCM connector for corrosion, bent pins, water intrusion and secure fit
- Check ABS/EBM-related fuses and relays
- Verify good chassis and battery ground connections, especially near module
- Check CAN bus communication to EBCM (loss-of-communication codes, bus voltage)
Signal parameters
- Battery supply voltage to EBCM: ~11–15 V (key on, engine running ≈12–14.8 V)
- EBCM ground continuity: near 0 Ω to chassis
- CAN high/low differential: approx. 2.5 V idle, ± differential ~1 V (varies by vehicle) — verify communications present
- Wheel speed sensor signals: AC or digital pulses proportional to wheel speed (should be present and consistent across wheels during wheel rotation)
- Pump motor current draw: should match factory spec during pump operation (excessive or no current indicates pump or control fault)
Diagnostic algorithm
- Connect a professional scan tool that supports ABS/EBCM, record all codes and freeze frame data.
- Confirm if C1255 is current or historic; clear codes and attempt a test drive to reproduce.
- Measure battery voltage at the EBCM connector with key on/engine running; verify within acceptable range.
- Inspect and secure power and ground wires at EBCM; clean corrosion and reseal connectors if needed.
- Check fuses/relays for ABS/EBCM circuits; test/replace if faulty.
- Use scan tool to check for CAN bus communication and other communication-related trouble codes (U-codes).
- Monitor live data: wheel speed sensors, pump request/status, and any internal EBCM status messages.
- Perform wiggle tests of wiring harness while monitoring live data to reveal intermittent faults.
- If power/ground/communication and sensors are good, check for available software updates/TSBs and attempt module reflash/reprogram per manufacturer procedure.
- If internal module fault persists after all external causes are ruled out and reflashing fails, replace EBCM and perform required relearns and programming.
- After repair or replacement, clear codes and perform a full road test to confirm ABS/EBCM functionality and ensure no related codes return.
Likely causes
- Bad ground or low battery voltage to EBCM
- Corroded/wet connector at the EBCM
- Module internal component failure
- Software corruption needing reflash/reprogram
- CAN bus wiring fault or another module putting bus into error
Fault status
Status
The EBCM has detected an internal malfunction. ABS and traction control features may be disabled. Inspect power, ground, connectors and communications; module reflash or replacement may be required.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
84
Browse 84 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HYUNDAI
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Accent
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HYUNDAI: 2020
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Veloster N
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Code
C1255
Other
C — Chassis
ABS Inlet Valve Coil RR Circuit Open
Views:
UK: 23
EN: 39
RU: 22
AI status
Completed
Completed
100%
Causes
- Internal EBCM hardware failure (processor, memory, PCB components)
- Corrupted or failed EBCM software/firmware
- Intermittent or low power supply to EBCM (battery/charging/ignition circuit)
- Poor or corroded ground or connector damage at the EBCM
- Water intrusion or physical damage to module or connector
- Severe CAN bus or communication errors affecting the EBCM
Symptoms
- ABS warning lamp ON
- Traction control/ESC warning lamp ON or disabled
- Loss of ABS and traction control functions (longer stopping distances under ABS events)
- Stored or intermittent ABS/EBCM diagnostic trouble codes
- Possible warning chimes or reduced vehicle stability assistance
What to check
- Read all stored and pending codes and freeze frame with a capable scan tool
- Confirm battery voltage and charging system (measure with engine off and running)
- Inspect EBCM connector for corrosion, bent pins, water intrusion and secure fit
- Check ABS/EBM-related fuses and relays
- Verify good chassis and battery ground connections, especially near module
- Check CAN bus communication to EBCM (loss-of-communication codes, bus voltage)
Signal parameters
- Battery supply voltage to EBCM: ~11–15 V (key on, engine running ≈12–14.8 V)
- EBCM ground continuity: near 0 Ω to chassis
- CAN high/low differential: approx. 2.5 V idle, ± differential ~1 V (varies by vehicle) — verify communications present
- Wheel speed sensor signals: AC or digital pulses proportional to wheel speed (should be present and consistent across wheels during wheel rotation)
- Pump motor current draw: should match factory spec during pump operation (excessive or no current indicates pump or control fault)
Diagnostic algorithm
- Connect a professional scan tool that supports ABS/EBCM, record all codes and freeze frame data.
- Confirm if C1255 is current or historic; clear codes and attempt a test drive to reproduce.
- Measure battery voltage at the EBCM connector with key on/engine running; verify within acceptable range.
- Inspect and secure power and ground wires at EBCM; clean corrosion and reseal connectors if needed.
- Check fuses/relays for ABS/EBCM circuits; test/replace if faulty.
- Use scan tool to check for CAN bus communication and other communication-related trouble codes (U-codes).
- Monitor live data: wheel speed sensors, pump request/status, and any internal EBCM status messages.
- Perform wiggle tests of wiring harness while monitoring live data to reveal intermittent faults.
- If power/ground/communication and sensors are good, check for available software updates/TSBs and attempt module reflash/reprogram per manufacturer procedure.
- If internal module fault persists after all external causes are ruled out and reflashing fails, replace EBCM and perform required relearns and programming.
- After repair or replacement, clear codes and perform a full road test to confirm ABS/EBCM functionality and ensure no related codes return.
Likely causes
- Bad ground or low battery voltage to EBCM
- Corroded/wet connector at the EBCM
- Module internal component failure
- Software corruption needing reflash/reprogram
- CAN bus wiring fault or another module putting bus into error
Fault status
Status
The EBCM has detected an internal malfunction. ABS and traction control features may be disabled. Inspect power, ground, connectors and communications; module reflash or replacement may be required.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Brands with available manuals
2,559
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