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Home / DTC / C1261 — Left Front Inlet Valve Solenoid Malfunction

C1261 — Left Front Inlet Valve Solenoid Malfunction

Detailed page for trouble code C1261.

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C1261

HUMMER C — Chassis

Left Front Inlet Valve Solenoid Malfunction

Brand: HUMMER
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high resistance in solenoid wiring harness
  • Corroded, loose or damaged connector at the ABS hydraulic unit
  • Failed inlet valve solenoid coil or internal valve mechanism
  • Contamination or debris in hydraulic block causing valve to stick
  • Faulty ABS/ESC hydraulic control module or driver transistor
  • Low battery or poor power/ground to ABS module

Symptoms

  • ABS and/or traction control warning lamp illuminated
  • Possible ESC/Traction control reduced functionality or disabled message
  • ABS may engage incorrectly or fail to modulate braking at the left front wheel
  • Longer stopping distance or unusual brake feel during ABS events
  • Stored DTC C1261 with related ABS codes
  • Occasional pump/motor noise from ABS module during self-tests

What to check

  • Retrieve all stored ABS/ESC codes and freeze-frame data with a capable scan tool
  • Check vehicle battery voltage and charging system; low voltage can corrupt tests
  • Visually inspect wiring and connector at the left-front inlet solenoid and ABS hydraulic unit for corrosion, bent pins, or water ingress
  • Check for related wheel speed sensor codes and address them first if present
  • Perform a wiggle test on harness while monitoring live data or stored codes for intermittent faults
  • Check ABS module fuses and power/ground circuits

Signal parameters

  • Solenoid coil resistance (typical range) – approximately 5–20 ohms (varies by model; compare to factory spec)
  • Supply voltage at solenoid connector when commanded – should be near battery voltage for direct-drive solenoids (~11–14 V) or pulsed/PWM for proportional solenoids
  • PWM duty cycle when modulated – varies with ABS demand; check scan tool commanded duty
  • Current draw when energized – coil should draw current consistent with its resistance (use clamp meter or bench test)
  • Activation response time – solenoid should respond quickly when commanded (milliseconds); slow/no response indicates mechanical or electrical fault)

Diagnostic algorithm

  1. Read and record ABS/ESC codes and live data with a bi-directional scan tool. Note any related codes (wheel speed, pressure sensor, other solenoids).
  2. Verify battery voltage (12.4 V+) and good grounds. Replace or charge battery if low before testing.
  3. Visually inspect the left-front inlet solenoid connector and harness for damage, corrosion, water intrusion, or pin deformation. Repair as needed.
  4. With ignition ON and engine OFF, backprobe the solenoid connector while commanding the solenoid on/off with a scan tool. Verify the expected control voltage/pulse and a good ground. If no command signal, suspect module or wiring upstream.
  5. Measure coil resistance at the connector (with connector disconnected from module). Compare to factory spec (or typical range provided). Open/infinite or shorted readings indicate bad coil or short to ground/power.
  6. Perform a continuity check from the module pin to the solenoid connector pin to identify opens/shorts in the harness. Repair any faults.
  7. If electrical checks are good but solenoid does not operate, remove and bench-test the solenoid/valve assembly (apply correct test voltage/pulses per service manual or use manufacturer test adapter). Observe mechanical movement and current draw.
  8. Inspect brake fluid condition and hydraulic block for contamination if valve is mechanically sticking. Replace or service hydraulic unit per factory procedures.
  9. If solenoid and harness test good but code persists, consider ABS hydraulic control module failure. Confirm with manufacturer-recommended tests before replacing module; module replacement may require programming/initialization.
  10. After repairs, clear codes and perform an ABS self-test and a road test to confirm proper operation and no return of C1261.

Likely causes

  • Open/short/high-resistance wiring or poor connector at the left-front solenoid
  • Contaminated or mechanically stuck inlet valve solenoid
  • Failed solenoid coil or internal valve assembly
  • Faulty ABS hydraulic control module (less common)

Fault status

⚠️ Status
Left front inlet valve solenoid electrical or mechanical malfunction detected by ABS hydraulic control unit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1260 C1262 C1234 C1251 U0121
Repair manuals

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Code

C1261

HYUNDAI C — Chassis

Steering Sensor - Low | Steering Angle Sensor Not Calibrated

Brand: HYUNDAI
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high resistance in solenoid wiring harness
  • Corroded, loose or damaged connector at the ABS hydraulic unit
  • Failed inlet valve solenoid coil or internal valve mechanism
  • Contamination or debris in hydraulic block causing valve to stick
  • Faulty ABS/ESC hydraulic control module or driver transistor
  • Low battery or poor power/ground to ABS module

Symptoms

  • ABS and/or traction control warning lamp illuminated
  • Possible ESC/Traction control reduced functionality or disabled message
  • ABS may engage incorrectly or fail to modulate braking at the left front wheel
  • Longer stopping distance or unusual brake feel during ABS events
  • Stored DTC C1261 with related ABS codes
  • Occasional pump/motor noise from ABS module during self-tests

What to check

  • Retrieve all stored ABS/ESC codes and freeze-frame data with a capable scan tool
  • Check vehicle battery voltage and charging system; low voltage can corrupt tests
  • Visually inspect wiring and connector at the left-front inlet solenoid and ABS hydraulic unit for corrosion, bent pins, or water ingress
  • Check for related wheel speed sensor codes and address them first if present
  • Perform a wiggle test on harness while monitoring live data or stored codes for intermittent faults
  • Check ABS module fuses and power/ground circuits

Signal parameters

  • Solenoid coil resistance (typical range) – approximately 5–20 ohms (varies by model; compare to factory spec)
  • Supply voltage at solenoid connector when commanded – should be near battery voltage for direct-drive solenoids (~11–14 V) or pulsed/PWM for proportional solenoids
  • PWM duty cycle when modulated – varies with ABS demand; check scan tool commanded duty
  • Current draw when energized – coil should draw current consistent with its resistance (use clamp meter or bench test)
  • Activation response time – solenoid should respond quickly when commanded (milliseconds); slow/no response indicates mechanical or electrical fault)

Diagnostic algorithm

  1. Read and record ABS/ESC codes and live data with a bi-directional scan tool. Note any related codes (wheel speed, pressure sensor, other solenoids).
  2. Verify battery voltage (12.4 V+) and good grounds. Replace or charge battery if low before testing.
  3. Visually inspect the left-front inlet solenoid connector and harness for damage, corrosion, water intrusion, or pin deformation. Repair as needed.
  4. With ignition ON and engine OFF, backprobe the solenoid connector while commanding the solenoid on/off with a scan tool. Verify the expected control voltage/pulse and a good ground. If no command signal, suspect module or wiring upstream.
  5. Measure coil resistance at the connector (with connector disconnected from module). Compare to factory spec (or typical range provided). Open/infinite or shorted readings indicate bad coil or short to ground/power.
  6. Perform a continuity check from the module pin to the solenoid connector pin to identify opens/shorts in the harness. Repair any faults.
  7. If electrical checks are good but solenoid does not operate, remove and bench-test the solenoid/valve assembly (apply correct test voltage/pulses per service manual or use manufacturer test adapter). Observe mechanical movement and current draw.
  8. Inspect brake fluid condition and hydraulic block for contamination if valve is mechanically sticking. Replace or service hydraulic unit per factory procedures.
  9. If solenoid and harness test good but code persists, consider ABS hydraulic control module failure. Confirm with manufacturer-recommended tests before replacing module; module replacement may require programming/initialization.
  10. After repairs, clear codes and perform an ABS self-test and a road test to confirm proper operation and no return of C1261.

Likely causes

  • Open/short/high-resistance wiring or poor connector at the left-front solenoid
  • Contaminated or mechanically stuck inlet valve solenoid
  • Failed solenoid coil or internal valve assembly
  • Faulty ABS hydraulic control module (less common)

Fault status

⚠️ Status
Left front inlet valve solenoid electrical or mechanical malfunction detected by ABS hydraulic control unit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1260 C1262 C1234 C1251 U0121
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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Code

C1261

LAND ROVER C — Chassis

Left rear sensor - wheel speed comparison Failure in the power relay circuit of the ABS valve in the detection of disturbances

Brand: LAND ROVER
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high resistance in solenoid wiring harness
  • Corroded, loose or damaged connector at the ABS hydraulic unit
  • Failed inlet valve solenoid coil or internal valve mechanism
  • Contamination or debris in hydraulic block causing valve to stick
  • Faulty ABS/ESC hydraulic control module or driver transistor
  • Low battery or poor power/ground to ABS module

Symptoms

  • ABS and/or traction control warning lamp illuminated
  • Possible ESC/Traction control reduced functionality or disabled message
  • ABS may engage incorrectly or fail to modulate braking at the left front wheel
  • Longer stopping distance or unusual brake feel during ABS events
  • Stored DTC C1261 with related ABS codes
  • Occasional pump/motor noise from ABS module during self-tests

What to check

  • Retrieve all stored ABS/ESC codes and freeze-frame data with a capable scan tool
  • Check vehicle battery voltage and charging system; low voltage can corrupt tests
  • Visually inspect wiring and connector at the left-front inlet solenoid and ABS hydraulic unit for corrosion, bent pins, or water ingress
  • Check for related wheel speed sensor codes and address them first if present
  • Perform a wiggle test on harness while monitoring live data or stored codes for intermittent faults
  • Check ABS module fuses and power/ground circuits

Signal parameters

  • Solenoid coil resistance (typical range) – approximately 5–20 ohms (varies by model; compare to factory spec)
  • Supply voltage at solenoid connector when commanded – should be near battery voltage for direct-drive solenoids (~11–14 V) or pulsed/PWM for proportional solenoids
  • PWM duty cycle when modulated – varies with ABS demand; check scan tool commanded duty
  • Current draw when energized – coil should draw current consistent with its resistance (use clamp meter or bench test)
  • Activation response time – solenoid should respond quickly when commanded (milliseconds); slow/no response indicates mechanical or electrical fault)

Diagnostic algorithm

  1. Read and record ABS/ESC codes and live data with a bi-directional scan tool. Note any related codes (wheel speed, pressure sensor, other solenoids).
  2. Verify battery voltage (12.4 V+) and good grounds. Replace or charge battery if low before testing.
  3. Visually inspect the left-front inlet solenoid connector and harness for damage, corrosion, water intrusion, or pin deformation. Repair as needed.
  4. With ignition ON and engine OFF, backprobe the solenoid connector while commanding the solenoid on/off with a scan tool. Verify the expected control voltage/pulse and a good ground. If no command signal, suspect module or wiring upstream.
  5. Measure coil resistance at the connector (with connector disconnected from module). Compare to factory spec (or typical range provided). Open/infinite or shorted readings indicate bad coil or short to ground/power.
  6. Perform a continuity check from the module pin to the solenoid connector pin to identify opens/shorts in the harness. Repair any faults.
  7. If electrical checks are good but solenoid does not operate, remove and bench-test the solenoid/valve assembly (apply correct test voltage/pulses per service manual or use manufacturer test adapter). Observe mechanical movement and current draw.
  8. Inspect brake fluid condition and hydraulic block for contamination if valve is mechanically sticking. Replace or service hydraulic unit per factory procedures.
  9. If solenoid and harness test good but code persists, consider ABS hydraulic control module failure. Confirm with manufacturer-recommended tests before replacing module; module replacement may require programming/initialization.
  10. After repairs, clear codes and perform an ABS self-test and a road test to confirm proper operation and no return of C1261.

Likely causes

  • Open/short/high-resistance wiring or poor connector at the left-front solenoid
  • Contaminated or mechanically stuck inlet valve solenoid
  • Failed solenoid coil or internal valve assembly
  • Faulty ABS hydraulic control module (less common)

Fault status

⚠️ Status
Left front inlet valve solenoid electrical or mechanical malfunction detected by ABS hydraulic control unit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1260 C1262 C1234 C1251 U0121
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

C1261

MITSUBISHI C — Chassis

RL outlet valve

Brand: MITSUBISHI
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high resistance in solenoid wiring harness
  • Corroded, loose or damaged connector at the ABS hydraulic unit
  • Failed inlet valve solenoid coil or internal valve mechanism
  • Contamination or debris in hydraulic block causing valve to stick
  • Faulty ABS/ESC hydraulic control module or driver transistor
  • Low battery or poor power/ground to ABS module

Symptoms

  • ABS and/or traction control warning lamp illuminated
  • Possible ESC/Traction control reduced functionality or disabled message
  • ABS may engage incorrectly or fail to modulate braking at the left front wheel
  • Longer stopping distance or unusual brake feel during ABS events
  • Stored DTC C1261 with related ABS codes
  • Occasional pump/motor noise from ABS module during self-tests

What to check

  • Retrieve all stored ABS/ESC codes and freeze-frame data with a capable scan tool
  • Check vehicle battery voltage and charging system; low voltage can corrupt tests
  • Visually inspect wiring and connector at the left-front inlet solenoid and ABS hydraulic unit for corrosion, bent pins, or water ingress
  • Check for related wheel speed sensor codes and address them first if present
  • Perform a wiggle test on harness while monitoring live data or stored codes for intermittent faults
  • Check ABS module fuses and power/ground circuits

Signal parameters

  • Solenoid coil resistance (typical range) – approximately 5–20 ohms (varies by model; compare to factory spec)
  • Supply voltage at solenoid connector when commanded – should be near battery voltage for direct-drive solenoids (~11–14 V) or pulsed/PWM for proportional solenoids
  • PWM duty cycle when modulated – varies with ABS demand; check scan tool commanded duty
  • Current draw when energized – coil should draw current consistent with its resistance (use clamp meter or bench test)
  • Activation response time – solenoid should respond quickly when commanded (milliseconds); slow/no response indicates mechanical or electrical fault)

Diagnostic algorithm

  1. Read and record ABS/ESC codes and live data with a bi-directional scan tool. Note any related codes (wheel speed, pressure sensor, other solenoids).
  2. Verify battery voltage (12.4 V+) and good grounds. Replace or charge battery if low before testing.
  3. Visually inspect the left-front inlet solenoid connector and harness for damage, corrosion, water intrusion, or pin deformation. Repair as needed.
  4. With ignition ON and engine OFF, backprobe the solenoid connector while commanding the solenoid on/off with a scan tool. Verify the expected control voltage/pulse and a good ground. If no command signal, suspect module or wiring upstream.
  5. Measure coil resistance at the connector (with connector disconnected from module). Compare to factory spec (or typical range provided). Open/infinite or shorted readings indicate bad coil or short to ground/power.
  6. Perform a continuity check from the module pin to the solenoid connector pin to identify opens/shorts in the harness. Repair any faults.
  7. If electrical checks are good but solenoid does not operate, remove and bench-test the solenoid/valve assembly (apply correct test voltage/pulses per service manual or use manufacturer test adapter). Observe mechanical movement and current draw.
  8. Inspect brake fluid condition and hydraulic block for contamination if valve is mechanically sticking. Replace or service hydraulic unit per factory procedures.
  9. If solenoid and harness test good but code persists, consider ABS hydraulic control module failure. Confirm with manufacturer-recommended tests before replacing module; module replacement may require programming/initialization.
  10. After repairs, clear codes and perform an ABS self-test and a road test to confirm proper operation and no return of C1261.

Likely causes

  • Open/short/high-resistance wiring or poor connector at the left-front solenoid
  • Contaminated or mechanically stuck inlet valve solenoid
  • Failed solenoid coil or internal valve assembly
  • Faulty ABS hydraulic control module (less common)

Fault status

⚠️ Status
Left front inlet valve solenoid electrical or mechanical malfunction detected by ABS hydraulic control unit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1260 C1262 C1234 C1251 U0121
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

C1261

Other C — Chassis

Speed Wheel LR Comparison Failure

Brand: Other
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high resistance in solenoid wiring harness
  • Corroded, loose or damaged connector at the ABS hydraulic unit
  • Failed inlet valve solenoid coil or internal valve mechanism
  • Contamination or debris in hydraulic block causing valve to stick
  • Faulty ABS/ESC hydraulic control module or driver transistor
  • Low battery or poor power/ground to ABS module

Symptoms

  • ABS and/or traction control warning lamp illuminated
  • Possible ESC/Traction control reduced functionality or disabled message
  • ABS may engage incorrectly or fail to modulate braking at the left front wheel
  • Longer stopping distance or unusual brake feel during ABS events
  • Stored DTC C1261 with related ABS codes
  • Occasional pump/motor noise from ABS module during self-tests

What to check

  • Retrieve all stored ABS/ESC codes and freeze-frame data with a capable scan tool
  • Check vehicle battery voltage and charging system; low voltage can corrupt tests
  • Visually inspect wiring and connector at the left-front inlet solenoid and ABS hydraulic unit for corrosion, bent pins, or water ingress
  • Check for related wheel speed sensor codes and address them first if present
  • Perform a wiggle test on harness while monitoring live data or stored codes for intermittent faults
  • Check ABS module fuses and power/ground circuits

Signal parameters

  • Solenoid coil resistance (typical range) – approximately 5–20 ohms (varies by model; compare to factory spec)
  • Supply voltage at solenoid connector when commanded – should be near battery voltage for direct-drive solenoids (~11–14 V) or pulsed/PWM for proportional solenoids
  • PWM duty cycle when modulated – varies with ABS demand; check scan tool commanded duty
  • Current draw when energized – coil should draw current consistent with its resistance (use clamp meter or bench test)
  • Activation response time – solenoid should respond quickly when commanded (milliseconds); slow/no response indicates mechanical or electrical fault)

Diagnostic algorithm

  1. Read and record ABS/ESC codes and live data with a bi-directional scan tool. Note any related codes (wheel speed, pressure sensor, other solenoids).
  2. Verify battery voltage (12.4 V+) and good grounds. Replace or charge battery if low before testing.
  3. Visually inspect the left-front inlet solenoid connector and harness for damage, corrosion, water intrusion, or pin deformation. Repair as needed.
  4. With ignition ON and engine OFF, backprobe the solenoid connector while commanding the solenoid on/off with a scan tool. Verify the expected control voltage/pulse and a good ground. If no command signal, suspect module or wiring upstream.
  5. Measure coil resistance at the connector (with connector disconnected from module). Compare to factory spec (or typical range provided). Open/infinite or shorted readings indicate bad coil or short to ground/power.
  6. Perform a continuity check from the module pin to the solenoid connector pin to identify opens/shorts in the harness. Repair any faults.
  7. If electrical checks are good but solenoid does not operate, remove and bench-test the solenoid/valve assembly (apply correct test voltage/pulses per service manual or use manufacturer test adapter). Observe mechanical movement and current draw.
  8. Inspect brake fluid condition and hydraulic block for contamination if valve is mechanically sticking. Replace or service hydraulic unit per factory procedures.
  9. If solenoid and harness test good but code persists, consider ABS hydraulic control module failure. Confirm with manufacturer-recommended tests before replacing module; module replacement may require programming/initialization.
  10. After repairs, clear codes and perform an ABS self-test and a road test to confirm proper operation and no return of C1261.

Likely causes

  • Open/short/high-resistance wiring or poor connector at the left-front solenoid
  • Contaminated or mechanically stuck inlet valve solenoid
  • Failed solenoid coil or internal valve assembly
  • Faulty ABS hydraulic control module (less common)

Fault status

⚠️ Status
Left front inlet valve solenoid electrical or mechanical malfunction detected by ABS hydraulic control unit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

C1260 C1262 C1234 C1251 U0121
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