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Home / DTC / C1273 — Right Front TCS Master Cylinder Isolation Valve Malfunction

C1273 — Right Front TCS Master Cylinder Isolation Valve Malfunction

Detailed page for trouble code C1273.

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C1273

HUMMER C — Chassis

Right Front TCS Master Cylinder Isolation Valve Malfunction

Brand: HUMMER
Type: C — Chassis
Views: UK: 14 EN: 12 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in valve wiring or connector
  • Corroded, loose, or missing connector pins at valve
  • Blown fuse or poor power supply to ABS/TCS module
  • Faulty right front master cylinder isolation valve (stuck, clogged, or internal short)
  • ABS/TCS control module output driver failure
  • Contamination or hydraulic blockage in brake circuit near the master cylinder/valve

Symptoms

  • TCS/ESC warning lamp illuminated
  • ABS light may also be on
  • Traction control or stability assist may be disabled or limited
  • Brake pedal feel altered or inconsistent during ABS/TCS events
  • Diagnostic trouble codes stored for right front isolation valve
  • Possible vehicle stability warnings or reduced brake modulation

What to check

  • Read all stored and pending codes and freeze frame data with a capable scan tool
  • Check for related ABS/TCS or CAN communication codes
  • Visually inspect right front isolation valve connector and wiring for damage, corrosion, or loose pins
  • Check fuses and power/ground circuits for ABS/TCS module
  • Perform wiggle test on harness while monitoring live data and codes
  • Use a scan tool to command the right front isolation valve on/off (actuator test) and monitor response

Signal parameters

  • Supply voltage at valve connector: approx. battery voltage (typically 11–14.5 V) when powered
  • Ground: solid chassis/ECU ground (0 Ω to small fraction) to supply return
  • Control signal: PWM or switched output from ABS/TCS module; duty cycle 0–100% depending on commanded state (scan tool will show commanded % if supported)
  • Typical solenoid coil resistance (nominal): commonly in the low-ohm range — often about 5–40 Ω (manufacturer-specific). Expect stable reading without intermittent spikes
  • No PWM or open circuit indicates wiring/connector/valve open; short to ground or low resistance to ground indicates shorted coil or shorted harness

Diagnostic algorithm

  1. Verify and record all DTCs and freeze frame data with an OEM-level scan tool.
  2. Inspect connector and harness at right front master cylinder isolation valve for corrosion, bent pins, water intrusion, or physical damage. Repair any damage and re-test.
  3. Check fuses and verify ABS/TCS module has proper battery power and ground. Repair any power/ground issues.
  4. With ignition ON, measure battery voltage at valve power pin; expect ~11–14 V. If missing, trace back to fuse/relay/ignition feed.
  5. Using DVOM, measure resistance of the valve solenoid coil at the valve connector (with harness disconnected). Compare to specification or expected range (low-ohm). Replace valve if open or shorted.
  6. Reconnect harness. Use scan tool actuator/test function to command the right front valve while monitoring voltage and current at the connector. Observe for PWM signal and coil activation. If module outputs command but valve does not respond and coil is good, inspect for mechanical/hydraulic blockage.
  7. If no command from module, backprobe the module output circuit and verify module driver operation. Check for related module faults and CAN communication errors.
  8. If wiring and module outputs are good but valve intermittently fails, perform a wiggle test along the harness while commanding the valve to identify intermittent opens/shorts.
  9. Inspect brake master cylinder and hydraulic lines near the valve for contamination, debris, or internal leakage. Flush or repair hydraulic components as required.
  10. After repairs, clear codes and perform a road test with live data to confirm the fault does not return. Re-scan for pending codes.

Likely causes

  • Damaged harness/connector at right front isolation valve
  • Valve solenoid coil shorted or open
  • Connector corrosion allowing high resistance or intermittent contact
  • ABS/TCS module not providing correct command or PWM due to internal driver failure
  • Brake fluid contamination or debris preventing valve movement

Fault status

⚠️ Status
Right Front TCS Master Cylinder Isolation Valve Malfunction — electrical or mechanical fault detected in the right front valve circuit or valve operation. May disable traction/stability control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1271 C1272 C1274 C1235 C1241
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Code

C1273

HYUNDAI C — Chassis

Engine Speed - No Signal

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 15 EN: 14 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in valve wiring or connector
  • Corroded, loose, or missing connector pins at valve
  • Blown fuse or poor power supply to ABS/TCS module
  • Faulty right front master cylinder isolation valve (stuck, clogged, or internal short)
  • ABS/TCS control module output driver failure
  • Contamination or hydraulic blockage in brake circuit near the master cylinder/valve

Symptoms

  • TCS/ESC warning lamp illuminated
  • ABS light may also be on
  • Traction control or stability assist may be disabled or limited
  • Brake pedal feel altered or inconsistent during ABS/TCS events
  • Diagnostic trouble codes stored for right front isolation valve
  • Possible vehicle stability warnings or reduced brake modulation

What to check

  • Read all stored and pending codes and freeze frame data with a capable scan tool
  • Check for related ABS/TCS or CAN communication codes
  • Visually inspect right front isolation valve connector and wiring for damage, corrosion, or loose pins
  • Check fuses and power/ground circuits for ABS/TCS module
  • Perform wiggle test on harness while monitoring live data and codes
  • Use a scan tool to command the right front isolation valve on/off (actuator test) and monitor response

Signal parameters

  • Supply voltage at valve connector: approx. battery voltage (typically 11–14.5 V) when powered
  • Ground: solid chassis/ECU ground (0 Ω to small fraction) to supply return
  • Control signal: PWM or switched output from ABS/TCS module; duty cycle 0–100% depending on commanded state (scan tool will show commanded % if supported)
  • Typical solenoid coil resistance (nominal): commonly in the low-ohm range — often about 5–40 Ω (manufacturer-specific). Expect stable reading without intermittent spikes
  • No PWM or open circuit indicates wiring/connector/valve open; short to ground or low resistance to ground indicates shorted coil or shorted harness

Diagnostic algorithm

  1. Verify and record all DTCs and freeze frame data with an OEM-level scan tool.
  2. Inspect connector and harness at right front master cylinder isolation valve for corrosion, bent pins, water intrusion, or physical damage. Repair any damage and re-test.
  3. Check fuses and verify ABS/TCS module has proper battery power and ground. Repair any power/ground issues.
  4. With ignition ON, measure battery voltage at valve power pin; expect ~11–14 V. If missing, trace back to fuse/relay/ignition feed.
  5. Using DVOM, measure resistance of the valve solenoid coil at the valve connector (with harness disconnected). Compare to specification or expected range (low-ohm). Replace valve if open or shorted.
  6. Reconnect harness. Use scan tool actuator/test function to command the right front valve while monitoring voltage and current at the connector. Observe for PWM signal and coil activation. If module outputs command but valve does not respond and coil is good, inspect for mechanical/hydraulic blockage.
  7. If no command from module, backprobe the module output circuit and verify module driver operation. Check for related module faults and CAN communication errors.
  8. If wiring and module outputs are good but valve intermittently fails, perform a wiggle test along the harness while commanding the valve to identify intermittent opens/shorts.
  9. Inspect brake master cylinder and hydraulic lines near the valve for contamination, debris, or internal leakage. Flush or repair hydraulic components as required.
  10. After repairs, clear codes and perform a road test with live data to confirm the fault does not return. Re-scan for pending codes.

Likely causes

  • Damaged harness/connector at right front isolation valve
  • Valve solenoid coil shorted or open
  • Connector corrosion allowing high resistance or intermittent contact
  • ABS/TCS module not providing correct command or PWM due to internal driver failure
  • Brake fluid contamination or debris preventing valve movement

Fault status

⚠️ Status
Right Front TCS Master Cylinder Isolation Valve Malfunction — electrical or mechanical fault detected in the right front valve circuit or valve operation. May disable traction/stability control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1271 C1272 C1274 C1235 C1241
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1273

MITSUBISHI C — Chassis

Motor drive circuit stuck off

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

Causes

  • Open or short in valve wiring or connector
  • Corroded, loose, or missing connector pins at valve
  • Blown fuse or poor power supply to ABS/TCS module
  • Faulty right front master cylinder isolation valve (stuck, clogged, or internal short)
  • ABS/TCS control module output driver failure
  • Contamination or hydraulic blockage in brake circuit near the master cylinder/valve

Symptoms

  • TCS/ESC warning lamp illuminated
  • ABS light may also be on
  • Traction control or stability assist may be disabled or limited
  • Brake pedal feel altered or inconsistent during ABS/TCS events
  • Diagnostic trouble codes stored for right front isolation valve
  • Possible vehicle stability warnings or reduced brake modulation

What to check

  • Read all stored and pending codes and freeze frame data with a capable scan tool
  • Check for related ABS/TCS or CAN communication codes
  • Visually inspect right front isolation valve connector and wiring for damage, corrosion, or loose pins
  • Check fuses and power/ground circuits for ABS/TCS module
  • Perform wiggle test on harness while monitoring live data and codes
  • Use a scan tool to command the right front isolation valve on/off (actuator test) and monitor response

Signal parameters

  • Supply voltage at valve connector: approx. battery voltage (typically 11–14.5 V) when powered
  • Ground: solid chassis/ECU ground (0 Ω to small fraction) to supply return
  • Control signal: PWM or switched output from ABS/TCS module; duty cycle 0–100% depending on commanded state (scan tool will show commanded % if supported)
  • Typical solenoid coil resistance (nominal): commonly in the low-ohm range — often about 5–40 Ω (manufacturer-specific). Expect stable reading without intermittent spikes
  • No PWM or open circuit indicates wiring/connector/valve open; short to ground or low resistance to ground indicates shorted coil or shorted harness

Diagnostic algorithm

  1. Verify and record all DTCs and freeze frame data with an OEM-level scan tool.
  2. Inspect connector and harness at right front master cylinder isolation valve for corrosion, bent pins, water intrusion, or physical damage. Repair any damage and re-test.
  3. Check fuses and verify ABS/TCS module has proper battery power and ground. Repair any power/ground issues.
  4. With ignition ON, measure battery voltage at valve power pin; expect ~11–14 V. If missing, trace back to fuse/relay/ignition feed.
  5. Using DVOM, measure resistance of the valve solenoid coil at the valve connector (with harness disconnected). Compare to specification or expected range (low-ohm). Replace valve if open or shorted.
  6. Reconnect harness. Use scan tool actuator/test function to command the right front valve while monitoring voltage and current at the connector. Observe for PWM signal and coil activation. If module outputs command but valve does not respond and coil is good, inspect for mechanical/hydraulic blockage.
  7. If no command from module, backprobe the module output circuit and verify module driver operation. Check for related module faults and CAN communication errors.
  8. If wiring and module outputs are good but valve intermittently fails, perform a wiggle test along the harness while commanding the valve to identify intermittent opens/shorts.
  9. Inspect brake master cylinder and hydraulic lines near the valve for contamination, debris, or internal leakage. Flush or repair hydraulic components as required.
  10. After repairs, clear codes and perform a road test with live data to confirm the fault does not return. Re-scan for pending codes.

Likely causes

  • Damaged harness/connector at right front isolation valve
  • Valve solenoid coil shorted or open
  • Connector corrosion allowing high resistance or intermittent contact
  • ABS/TCS module not providing correct command or PWM due to internal driver failure
  • Brake fluid contamination or debris preventing valve movement

Fault status

⚠️ Status
Right Front TCS Master Cylinder Isolation Valve Malfunction — electrical or mechanical fault detected in the right front valve circuit or valve operation. May disable traction/stability control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1271 C1272 C1274 C1235 C1241
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1273

Other C — Chassis

Motor # 2 Input Circuit Short to Vbat

Brand: Other
Type: C — Chassis
Views: UK: 18 EN: 27 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in valve wiring or connector
  • Corroded, loose, or missing connector pins at valve
  • Blown fuse or poor power supply to ABS/TCS module
  • Faulty right front master cylinder isolation valve (stuck, clogged, or internal short)
  • ABS/TCS control module output driver failure
  • Contamination or hydraulic blockage in brake circuit near the master cylinder/valve

Symptoms

  • TCS/ESC warning lamp illuminated
  • ABS light may also be on
  • Traction control or stability assist may be disabled or limited
  • Brake pedal feel altered or inconsistent during ABS/TCS events
  • Diagnostic trouble codes stored for right front isolation valve
  • Possible vehicle stability warnings or reduced brake modulation

What to check

  • Read all stored and pending codes and freeze frame data with a capable scan tool
  • Check for related ABS/TCS or CAN communication codes
  • Visually inspect right front isolation valve connector and wiring for damage, corrosion, or loose pins
  • Check fuses and power/ground circuits for ABS/TCS module
  • Perform wiggle test on harness while monitoring live data and codes
  • Use a scan tool to command the right front isolation valve on/off (actuator test) and monitor response

Signal parameters

  • Supply voltage at valve connector: approx. battery voltage (typically 11–14.5 V) when powered
  • Ground: solid chassis/ECU ground (0 Ω to small fraction) to supply return
  • Control signal: PWM or switched output from ABS/TCS module; duty cycle 0–100% depending on commanded state (scan tool will show commanded % if supported)
  • Typical solenoid coil resistance (nominal): commonly in the low-ohm range — often about 5–40 Ω (manufacturer-specific). Expect stable reading without intermittent spikes
  • No PWM or open circuit indicates wiring/connector/valve open; short to ground or low resistance to ground indicates shorted coil or shorted harness

Diagnostic algorithm

  1. Verify and record all DTCs and freeze frame data with an OEM-level scan tool.
  2. Inspect connector and harness at right front master cylinder isolation valve for corrosion, bent pins, water intrusion, or physical damage. Repair any damage and re-test.
  3. Check fuses and verify ABS/TCS module has proper battery power and ground. Repair any power/ground issues.
  4. With ignition ON, measure battery voltage at valve power pin; expect ~11–14 V. If missing, trace back to fuse/relay/ignition feed.
  5. Using DVOM, measure resistance of the valve solenoid coil at the valve connector (with harness disconnected). Compare to specification or expected range (low-ohm). Replace valve if open or shorted.
  6. Reconnect harness. Use scan tool actuator/test function to command the right front valve while monitoring voltage and current at the connector. Observe for PWM signal and coil activation. If module outputs command but valve does not respond and coil is good, inspect for mechanical/hydraulic blockage.
  7. If no command from module, backprobe the module output circuit and verify module driver operation. Check for related module faults and CAN communication errors.
  8. If wiring and module outputs are good but valve intermittently fails, perform a wiggle test along the harness while commanding the valve to identify intermittent opens/shorts.
  9. Inspect brake master cylinder and hydraulic lines near the valve for contamination, debris, or internal leakage. Flush or repair hydraulic components as required.
  10. After repairs, clear codes and perform a road test with live data to confirm the fault does not return. Re-scan for pending codes.

Likely causes

  • Damaged harness/connector at right front isolation valve
  • Valve solenoid coil shorted or open
  • Connector corrosion allowing high resistance or intermittent contact
  • ABS/TCS module not providing correct command or PWM due to internal driver failure
  • Brake fluid contamination or debris preventing valve movement

Fault status

⚠️ Status
Right Front TCS Master Cylinder Isolation Valve Malfunction — electrical or mechanical fault detected in the right front valve circuit or valve operation. May disable traction/stability control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1271 C1272 C1274 C1235 C1241
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  • 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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