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Home / DTC / C1256 — EBCM Internal Malfunction

C1256 — EBCM Internal Malfunction

Detailed page for trouble code C1256.

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Code

C1256

HUMMER C — Chassis

EBCM Internal Malfunction

Brand: HUMMER
Type: C — Chassis
Views: UK: 11 EN: 26 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty EBCM (internal hardware or firmware failure)
  • Low or intermittent battery voltage / poor charging system
  • Corroded, loose or damaged power/ground connectors at the EBCM
  • CAN bus communication faults or wiring damage
  • Faulty wheel speed sensor(s) or damaged sensor wiring
  • Blown fuse or failed relay supplying the EBCM

Symptoms

  • ABS, Traction Control (TCS) and/or StabiliTrak/ESC warning lights illuminated
  • Brake system warning light illuminated; possible degraded braking features
  • Loss of ABS and traction control functionality
  • Diagnostic trouble codes stored in EBCM and possibly other modules
  • Pump motor may run continuously or fail to operate during self-test
  • Possible reduced engine/traction performance or limp-home behavior

What to check

  • Read all stored DTCs and freeze frame data with a capable scan tool; record codes from all modules
  • Verify battery voltage at rest and with starter load (should be ~12.4–12.8V resting, >13.5V charging)
  • Inspect EBCM connector(s) for corrosion, bent pins, water intrusion, or damage
  • Check related fuses and relays for continuity and proper operation
  • Confirm proper ground(s) at the EBCM (measure resistance to chassis ground)
  • Check CAN bus integrity: measure bus voltage levels and verify termination and communication

Signal parameters

  • Module supply voltage: ~11–14.5 V with engine running
  • Module ground continuity:
  • CAN high/low idle voltages: approximately CAN High ~2.5–3.5 V, CAN Low ~1.5–1.0 V (verify against vehicle-specific values)
  • Wheel speed sensor AC output (passive sensors): amplitude and frequency proportional to wheel speed (typical few hundred mV up to several volts depending on speed)
  • Hall/active sensor reference: 5 V reference and digital square wave outputs where applicable
  • Pump motor current draw: within manufacturer spec during operation (excessive or no draw indicates motor/driver problem)

Diagnostic algorithm

  1. Connect a manufacturer-capable scan tool. Read and record all stored codes and freeze frame data from the EBCM and other modules. Note any U-codes indicating communication loss.
  2. Attempt to clear codes and perform a key/engine cycle to see if C1256 returns. Intermittent faults may reappear and help narrow cause.
  3. Verify battery state-of-charge and charging system operation. Recharge or replace weak battery before further testing.
  4. Visually inspect the EBCM housing and connectors for water, corrosion, contamination or physical damage. Repair or replace damaged wiring or connectors.
  5. Check fuses and relays that supply the EBCM and ABS pump. Replace any blown fuses and test relays.
  6. With connector(s) disconnected, back-probe the EBCM power and ground pins. Verify stable 12V supply and good ground continuity to chassis. Repair wiring or grounds that exceed expected resistance.
  7. Check CAN bus lines at the EBCM for correct idle voltages and ability to communicate. If no CAN traffic or abnormal levels are present, trace/repair bus wiring and terminations.
  8. Test wheel speed sensors: measure resistance for open/short, and measure AC output while spinning each wheel (or use scan tool to view wheel speed readings while driving slowly). Repair faulty sensors/wiring.
  9. If available, run EBCM self-tests and active tests with the scan tool to exercise pump motor and valves. Observe motor current draw and module responses.
  10. If wiring, power/grounds, sensors and CAN network are confirmed good and the fault persists, consider module internal failure. Check for available technical service bulletins or software updates before replacement.
  11. If replacement EBCM is required, follow manufacturer procedure for module programming and configuration. After repair, clear codes and perform road test to confirm proper operation.
  12. Re-scan all modules to ensure no related codes remain and that communications are restored.

Likely causes

  • Poor power/ground to the EBCM (loose connector, corrosion, weak battery)
  • CAN bus communication loss or intermittent wiring fault
  • Internal EBCM hardware or firmware failure
  • Faulty wheel speed sensor causing invalid inputs to the EBCM

Fault status

⚠️ Status
EBCM internal malfunction — Electronic Brake Control Module has detected an internal fault or invalid internal conditions. ABS/Traction functionality may be disabled until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

C1250 C1251 C1255 C1258 C1246 U0121
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Code

C1256

HYUNDAI C — Chassis

Rear Right(RR) Height Sensor Abnormal | EMS Indicates CAN Engine Torque Intervention Fault

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 16 EN: 29 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty EBCM (internal hardware or firmware failure)
  • Low or intermittent battery voltage / poor charging system
  • Corroded, loose or damaged power/ground connectors at the EBCM
  • CAN bus communication faults or wiring damage
  • Faulty wheel speed sensor(s) or damaged sensor wiring
  • Blown fuse or failed relay supplying the EBCM

Symptoms

  • ABS, Traction Control (TCS) and/or StabiliTrak/ESC warning lights illuminated
  • Brake system warning light illuminated; possible degraded braking features
  • Loss of ABS and traction control functionality
  • Diagnostic trouble codes stored in EBCM and possibly other modules
  • Pump motor may run continuously or fail to operate during self-test
  • Possible reduced engine/traction performance or limp-home behavior

What to check

  • Read all stored DTCs and freeze frame data with a capable scan tool; record codes from all modules
  • Verify battery voltage at rest and with starter load (should be ~12.4–12.8V resting, >13.5V charging)
  • Inspect EBCM connector(s) for corrosion, bent pins, water intrusion, or damage
  • Check related fuses and relays for continuity and proper operation
  • Confirm proper ground(s) at the EBCM (measure resistance to chassis ground)
  • Check CAN bus integrity: measure bus voltage levels and verify termination and communication

Signal parameters

  • Module supply voltage: ~11–14.5 V with engine running
  • Module ground continuity:
  • CAN high/low idle voltages: approximately CAN High ~2.5–3.5 V, CAN Low ~1.5–1.0 V (verify against vehicle-specific values)
  • Wheel speed sensor AC output (passive sensors): amplitude and frequency proportional to wheel speed (typical few hundred mV up to several volts depending on speed)
  • Hall/active sensor reference: 5 V reference and digital square wave outputs where applicable
  • Pump motor current draw: within manufacturer spec during operation (excessive or no draw indicates motor/driver problem)

Diagnostic algorithm

  1. Connect a manufacturer-capable scan tool. Read and record all stored codes and freeze frame data from the EBCM and other modules. Note any U-codes indicating communication loss.
  2. Attempt to clear codes and perform a key/engine cycle to see if C1256 returns. Intermittent faults may reappear and help narrow cause.
  3. Verify battery state-of-charge and charging system operation. Recharge or replace weak battery before further testing.
  4. Visually inspect the EBCM housing and connectors for water, corrosion, contamination or physical damage. Repair or replace damaged wiring or connectors.
  5. Check fuses and relays that supply the EBCM and ABS pump. Replace any blown fuses and test relays.
  6. With connector(s) disconnected, back-probe the EBCM power and ground pins. Verify stable 12V supply and good ground continuity to chassis. Repair wiring or grounds that exceed expected resistance.
  7. Check CAN bus lines at the EBCM for correct idle voltages and ability to communicate. If no CAN traffic or abnormal levels are present, trace/repair bus wiring and terminations.
  8. Test wheel speed sensors: measure resistance for open/short, and measure AC output while spinning each wheel (or use scan tool to view wheel speed readings while driving slowly). Repair faulty sensors/wiring.
  9. If available, run EBCM self-tests and active tests with the scan tool to exercise pump motor and valves. Observe motor current draw and module responses.
  10. If wiring, power/grounds, sensors and CAN network are confirmed good and the fault persists, consider module internal failure. Check for available technical service bulletins or software updates before replacement.
  11. If replacement EBCM is required, follow manufacturer procedure for module programming and configuration. After repair, clear codes and perform road test to confirm proper operation.
  12. Re-scan all modules to ensure no related codes remain and that communications are restored.

Likely causes

  • Poor power/ground to the EBCM (loose connector, corrosion, weak battery)
  • CAN bus communication loss or intermittent wiring fault
  • Internal EBCM hardware or firmware failure
  • Faulty wheel speed sensor causing invalid inputs to the EBCM

Fault status

⚠️ Status
EBCM internal malfunction — Electronic Brake Control Module has detected an internal fault or invalid internal conditions. ABS/Traction functionality may be disabled until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

C1250 C1251 C1255 C1258 C1246 U0121
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1256

MITSUBISHI C — Chassis

RL inlet valve

Brand: MITSUBISHI
Type: C — Chassis
Views: UK: 11 EN: 23 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty EBCM (internal hardware or firmware failure)
  • Low or intermittent battery voltage / poor charging system
  • Corroded, loose or damaged power/ground connectors at the EBCM
  • CAN bus communication faults or wiring damage
  • Faulty wheel speed sensor(s) or damaged sensor wiring
  • Blown fuse or failed relay supplying the EBCM

Symptoms

  • ABS, Traction Control (TCS) and/or StabiliTrak/ESC warning lights illuminated
  • Brake system warning light illuminated; possible degraded braking features
  • Loss of ABS and traction control functionality
  • Diagnostic trouble codes stored in EBCM and possibly other modules
  • Pump motor may run continuously or fail to operate during self-test
  • Possible reduced engine/traction performance or limp-home behavior

What to check

  • Read all stored DTCs and freeze frame data with a capable scan tool; record codes from all modules
  • Verify battery voltage at rest and with starter load (should be ~12.4–12.8V resting, >13.5V charging)
  • Inspect EBCM connector(s) for corrosion, bent pins, water intrusion, or damage
  • Check related fuses and relays for continuity and proper operation
  • Confirm proper ground(s) at the EBCM (measure resistance to chassis ground)
  • Check CAN bus integrity: measure bus voltage levels and verify termination and communication

Signal parameters

  • Module supply voltage: ~11–14.5 V with engine running
  • Module ground continuity:
  • CAN high/low idle voltages: approximately CAN High ~2.5–3.5 V, CAN Low ~1.5–1.0 V (verify against vehicle-specific values)
  • Wheel speed sensor AC output (passive sensors): amplitude and frequency proportional to wheel speed (typical few hundred mV up to several volts depending on speed)
  • Hall/active sensor reference: 5 V reference and digital square wave outputs where applicable
  • Pump motor current draw: within manufacturer spec during operation (excessive or no draw indicates motor/driver problem)

Diagnostic algorithm

  1. Connect a manufacturer-capable scan tool. Read and record all stored codes and freeze frame data from the EBCM and other modules. Note any U-codes indicating communication loss.
  2. Attempt to clear codes and perform a key/engine cycle to see if C1256 returns. Intermittent faults may reappear and help narrow cause.
  3. Verify battery state-of-charge and charging system operation. Recharge or replace weak battery before further testing.
  4. Visually inspect the EBCM housing and connectors for water, corrosion, contamination or physical damage. Repair or replace damaged wiring or connectors.
  5. Check fuses and relays that supply the EBCM and ABS pump. Replace any blown fuses and test relays.
  6. With connector(s) disconnected, back-probe the EBCM power and ground pins. Verify stable 12V supply and good ground continuity to chassis. Repair wiring or grounds that exceed expected resistance.
  7. Check CAN bus lines at the EBCM for correct idle voltages and ability to communicate. If no CAN traffic or abnormal levels are present, trace/repair bus wiring and terminations.
  8. Test wheel speed sensors: measure resistance for open/short, and measure AC output while spinning each wheel (or use scan tool to view wheel speed readings while driving slowly). Repair faulty sensors/wiring.
  9. If available, run EBCM self-tests and active tests with the scan tool to exercise pump motor and valves. Observe motor current draw and module responses.
  10. If wiring, power/grounds, sensors and CAN network are confirmed good and the fault persists, consider module internal failure. Check for available technical service bulletins or software updates before replacement.
  11. If replacement EBCM is required, follow manufacturer procedure for module programming and configuration. After repair, clear codes and perform road test to confirm proper operation.
  12. Re-scan all modules to ensure no related codes remain and that communications are restored.

Likely causes

  • Poor power/ground to the EBCM (loose connector, corrosion, weak battery)
  • CAN bus communication loss or intermittent wiring fault
  • Internal EBCM hardware or firmware failure
  • Faulty wheel speed sensor causing invalid inputs to the EBCM

Fault status

⚠️ Status
EBCM internal malfunction — Electronic Brake Control Module has detected an internal fault or invalid internal conditions. ABS/Traction functionality may be disabled until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

C1250 C1251 C1255 C1258 C1246 U0121
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1256

Other C — Chassis

ABS Inlet Valve Coil RR Circuit Short To Battery

Brand: Other
Type: C — Chassis
Views: UK: 16 EN: 33 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty EBCM (internal hardware or firmware failure)
  • Low or intermittent battery voltage / poor charging system
  • Corroded, loose or damaged power/ground connectors at the EBCM
  • CAN bus communication faults or wiring damage
  • Faulty wheel speed sensor(s) or damaged sensor wiring
  • Blown fuse or failed relay supplying the EBCM

Symptoms

  • ABS, Traction Control (TCS) and/or StabiliTrak/ESC warning lights illuminated
  • Brake system warning light illuminated; possible degraded braking features
  • Loss of ABS and traction control functionality
  • Diagnostic trouble codes stored in EBCM and possibly other modules
  • Pump motor may run continuously or fail to operate during self-test
  • Possible reduced engine/traction performance or limp-home behavior

What to check

  • Read all stored DTCs and freeze frame data with a capable scan tool; record codes from all modules
  • Verify battery voltage at rest and with starter load (should be ~12.4–12.8V resting, >13.5V charging)
  • Inspect EBCM connector(s) for corrosion, bent pins, water intrusion, or damage
  • Check related fuses and relays for continuity and proper operation
  • Confirm proper ground(s) at the EBCM (measure resistance to chassis ground)
  • Check CAN bus integrity: measure bus voltage levels and verify termination and communication

Signal parameters

  • Module supply voltage: ~11–14.5 V with engine running
  • Module ground continuity:
  • CAN high/low idle voltages: approximately CAN High ~2.5–3.5 V, CAN Low ~1.5–1.0 V (verify against vehicle-specific values)
  • Wheel speed sensor AC output (passive sensors): amplitude and frequency proportional to wheel speed (typical few hundred mV up to several volts depending on speed)
  • Hall/active sensor reference: 5 V reference and digital square wave outputs where applicable
  • Pump motor current draw: within manufacturer spec during operation (excessive or no draw indicates motor/driver problem)

Diagnostic algorithm

  1. Connect a manufacturer-capable scan tool. Read and record all stored codes and freeze frame data from the EBCM and other modules. Note any U-codes indicating communication loss.
  2. Attempt to clear codes and perform a key/engine cycle to see if C1256 returns. Intermittent faults may reappear and help narrow cause.
  3. Verify battery state-of-charge and charging system operation. Recharge or replace weak battery before further testing.
  4. Visually inspect the EBCM housing and connectors for water, corrosion, contamination or physical damage. Repair or replace damaged wiring or connectors.
  5. Check fuses and relays that supply the EBCM and ABS pump. Replace any blown fuses and test relays.
  6. With connector(s) disconnected, back-probe the EBCM power and ground pins. Verify stable 12V supply and good ground continuity to chassis. Repair wiring or grounds that exceed expected resistance.
  7. Check CAN bus lines at the EBCM for correct idle voltages and ability to communicate. If no CAN traffic or abnormal levels are present, trace/repair bus wiring and terminations.
  8. Test wheel speed sensors: measure resistance for open/short, and measure AC output while spinning each wheel (or use scan tool to view wheel speed readings while driving slowly). Repair faulty sensors/wiring.
  9. If available, run EBCM self-tests and active tests with the scan tool to exercise pump motor and valves. Observe motor current draw and module responses.
  10. If wiring, power/grounds, sensors and CAN network are confirmed good and the fault persists, consider module internal failure. Check for available technical service bulletins or software updates before replacement.
  11. If replacement EBCM is required, follow manufacturer procedure for module programming and configuration. After repair, clear codes and perform road test to confirm proper operation.
  12. Re-scan all modules to ensure no related codes remain and that communications are restored.

Likely causes

  • Poor power/ground to the EBCM (loose connector, corrosion, weak battery)
  • CAN bus communication loss or intermittent wiring fault
  • Internal EBCM hardware or firmware failure
  • Faulty wheel speed sensor causing invalid inputs to the EBCM

Fault status

⚠️ Status
EBCM internal malfunction — Electronic Brake Control Module has detected an internal fault or invalid internal conditions. ABS/Traction functionality may be disabled until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

C1250 C1251 C1255 C1258 C1246 U0121
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  • 2.4 ESD (electrostatic discharge) workplace
  • 2.5 Routing and attachment of lines and wiring
  • 2.6 Identification plates
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)

Workshop Manual
Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

199,00 UAH
Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
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LAND ROVER 3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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