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Home / DTC / C001D — Right rear discharge valve

C001D — Right rear discharge valve

Detailed page for trouble code C001D.

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C001D

ALFA ROMEO C — Chassis

Right rear discharge valve

Brand: ALFA ROMEO
Type: C — Chassis
Views: UK: 5 EN: 7 RU: 6
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short circuit in the right rear discharge valve wiring
  • Corroded, contaminated or loose connector at the valve or ABS modulator
  • Faulty right rear discharge valve (stuck, coil open/shorted)
  • Internal failure in the ABS/ESP hydraulic unit (modulator/pump assembly)
  • Poor ground or low battery/voltage supply to ABS module
  • Intermittent wiring fault (broken conductor, chaffed cable)

Symptoms

  • ABS and/or ESP warning lamp illuminated
  • Traction control/ESP disabled or limited functionality
  • ABS intervention may be absent or irregular during braking
  • Possible altered brake feel or pulsation under ABS activation
  • Stored fault code(s) related to ABS hydraulic valves

What to check

  • Read all stored and pending ABS/ESP codes with a capable scanner and record freeze frame data
  • Perform a visual inspection of the wiring harness and connectors at the right rear discharge valve and ABS hydraulic unit for damage or corrosion
  • Check battery voltage and fuses/relays related to ABS/ESP power supply
  • Measure resistance of the right rear discharge valve coil at the valve connector (with connector disconnected)
  • Check for continuity and shorts to ground/power between the valve connector and ABS control module connector
  • Use a diagnostic tool to perform an ABS/ESP actuator/solenoid test to confirm valve activation

Signal parameters

  • Supply voltage: approx. battery voltage (~12 V) at ABS module power feed; expect 11–14 V with engine on
  • Control signal: ABS module typically drives discharge valves with a PWM current/duty cycle; duty cycle ranges 0–100% depending on command
  • Typical PWM frequency: varies by manufacturer (commonly 50–200 Hz); consult OEM data
  • Valve coil resistance: typically low (example ranges 5–40 ohms) — consult Alfa Romeo OEM spec for exact value
  • Expected behavior during actuator test: measurable current draw and audible/physical valve activation; live-data duty cycle should change when commanded

Diagnostic algorithm

  1. Connect a professional diagnostic scanner and read all ABS/ESP codes and freeze frame data. Note any related codes.
  2. Clear codes and attempt to re-create the fault under conditions noted in freeze frame (safe road test or bench activation) to verify persistence.
  3. Visually inspect right rear discharge valve connector and wiring for damage, corrosion, water ingress, or pin deformation. Repair or clean as needed.
  4. With ignition off, disconnect the valve connector and measure coil resistance across the valve pins. Compare to OEM specification or to the opposite side valve if possible.
  5. Check for short to ground or to battery using a multimeter between each valve pin and vehicle ground/battery positive.
  6. Backprobe the valve connector and command the valve using the diagnostic tool (actuator test). Measure voltage/pulse and confirm the ABS module is commanding the valve (observe duty cycle/current draw).
  7. Perform a wiggle test on harness while commanding the valve to detect intermittent faults.
  8. If wiring and connector tests are good but valve fails resistance or actuator test, replace the right rear discharge valve or hydraulic modulator assembly as required. If valve replacement is not separately available, replacement of the hydraulic unit may be necessary.
  9. If wiring and valve are good, inspect/replace ABS module or repair internal module faults only after confirming module commands and power/ground are correct. Consider module reprogramming or bench repair per OEM guidance.
  10. After repair, clear codes and perform a road test with diagnostics connected to confirm the fault is resolved and no new codes appear.

Likely causes

  • Damaged or corroded connector at the right rear discharge valve
  • Open or high resistance in the valve coil (wiring or valve)
  • Valve coil shorted to ground or to supply
  • Failed valve or hydraulic unit internal fault

Fault status

⚠️ Status
Right rear discharge valve circuit fault detected (electrical or functional issue in ABS hydraulic unit).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C001C C001E C0035 C0040 C0120
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Code

C001D

FIAT C — Chassis

Right rear discharge valve

Brand: FIAT
Type: C — Chassis
Views: UK: 5 EN: 7 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short circuit in the right rear discharge valve wiring
  • Corroded, contaminated or loose connector at the valve or ABS modulator
  • Faulty right rear discharge valve (stuck, coil open/shorted)
  • Internal failure in the ABS/ESP hydraulic unit (modulator/pump assembly)
  • Poor ground or low battery/voltage supply to ABS module
  • Intermittent wiring fault (broken conductor, chaffed cable)

Symptoms

  • ABS and/or ESP warning lamp illuminated
  • Traction control/ESP disabled or limited functionality
  • ABS intervention may be absent or irregular during braking
  • Possible altered brake feel or pulsation under ABS activation
  • Stored fault code(s) related to ABS hydraulic valves

What to check

  • Read all stored and pending ABS/ESP codes with a capable scanner and record freeze frame data
  • Perform a visual inspection of the wiring harness and connectors at the right rear discharge valve and ABS hydraulic unit for damage or corrosion
  • Check battery voltage and fuses/relays related to ABS/ESP power supply
  • Measure resistance of the right rear discharge valve coil at the valve connector (with connector disconnected)
  • Check for continuity and shorts to ground/power between the valve connector and ABS control module connector
  • Use a diagnostic tool to perform an ABS/ESP actuator/solenoid test to confirm valve activation

Signal parameters

  • Supply voltage: approx. battery voltage (~12 V) at ABS module power feed; expect 11–14 V with engine on
  • Control signal: ABS module typically drives discharge valves with a PWM current/duty cycle; duty cycle ranges 0–100% depending on command
  • Typical PWM frequency: varies by manufacturer (commonly 50–200 Hz); consult OEM data
  • Valve coil resistance: typically low (example ranges 5–40 ohms) — consult Alfa Romeo OEM spec for exact value
  • Expected behavior during actuator test: measurable current draw and audible/physical valve activation; live-data duty cycle should change when commanded

Diagnostic algorithm

  1. Connect a professional diagnostic scanner and read all ABS/ESP codes and freeze frame data. Note any related codes.
  2. Clear codes and attempt to re-create the fault under conditions noted in freeze frame (safe road test or bench activation) to verify persistence.
  3. Visually inspect right rear discharge valve connector and wiring for damage, corrosion, water ingress, or pin deformation. Repair or clean as needed.
  4. With ignition off, disconnect the valve connector and measure coil resistance across the valve pins. Compare to OEM specification or to the opposite side valve if possible.
  5. Check for short to ground or to battery using a multimeter between each valve pin and vehicle ground/battery positive.
  6. Backprobe the valve connector and command the valve using the diagnostic tool (actuator test). Measure voltage/pulse and confirm the ABS module is commanding the valve (observe duty cycle/current draw).
  7. Perform a wiggle test on harness while commanding the valve to detect intermittent faults.
  8. If wiring and connector tests are good but valve fails resistance or actuator test, replace the right rear discharge valve or hydraulic modulator assembly as required. If valve replacement is not separately available, replacement of the hydraulic unit may be necessary.
  9. If wiring and valve are good, inspect/replace ABS module or repair internal module faults only after confirming module commands and power/ground are correct. Consider module reprogramming or bench repair per OEM guidance.
  10. After repair, clear codes and perform a road test with diagnostics connected to confirm the fault is resolved and no new codes appear.

Likely causes

  • Damaged or corroded connector at the right rear discharge valve
  • Open or high resistance in the valve coil (wiring or valve)
  • Valve coil shorted to ground or to supply
  • Failed valve or hydraulic unit internal fault

Fault status

⚠️ Status
Right rear discharge valve circuit fault detected (electrical or functional issue in ABS hydraulic unit).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C001C C001E C0035 C0040 C0120
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Code

C001D

Generic C — Chassis

Right Rear Outlet Control

Brand: Generic
Type: C — Chassis
Views: UK: 24 EN: 26 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short circuit in the right rear discharge valve wiring
  • Corroded, contaminated or loose connector at the valve or ABS modulator
  • Faulty right rear discharge valve (stuck, coil open/shorted)
  • Internal failure in the ABS/ESP hydraulic unit (modulator/pump assembly)
  • Poor ground or low battery/voltage supply to ABS module
  • Intermittent wiring fault (broken conductor, chaffed cable)

Symptoms

  • ABS and/or ESP warning lamp illuminated
  • Traction control/ESP disabled or limited functionality
  • ABS intervention may be absent or irregular during braking
  • Possible altered brake feel or pulsation under ABS activation
  • Stored fault code(s) related to ABS hydraulic valves

What to check

  • Read all stored and pending ABS/ESP codes with a capable scanner and record freeze frame data
  • Perform a visual inspection of the wiring harness and connectors at the right rear discharge valve and ABS hydraulic unit for damage or corrosion
  • Check battery voltage and fuses/relays related to ABS/ESP power supply
  • Measure resistance of the right rear discharge valve coil at the valve connector (with connector disconnected)
  • Check for continuity and shorts to ground/power between the valve connector and ABS control module connector
  • Use a diagnostic tool to perform an ABS/ESP actuator/solenoid test to confirm valve activation

Signal parameters

  • Supply voltage: approx. battery voltage (~12 V) at ABS module power feed; expect 11–14 V with engine on
  • Control signal: ABS module typically drives discharge valves with a PWM current/duty cycle; duty cycle ranges 0–100% depending on command
  • Typical PWM frequency: varies by manufacturer (commonly 50–200 Hz); consult OEM data
  • Valve coil resistance: typically low (example ranges 5–40 ohms) — consult Alfa Romeo OEM spec for exact value
  • Expected behavior during actuator test: measurable current draw and audible/physical valve activation; live-data duty cycle should change when commanded

Diagnostic algorithm

  1. Connect a professional diagnostic scanner and read all ABS/ESP codes and freeze frame data. Note any related codes.
  2. Clear codes and attempt to re-create the fault under conditions noted in freeze frame (safe road test or bench activation) to verify persistence.
  3. Visually inspect right rear discharge valve connector and wiring for damage, corrosion, water ingress, or pin deformation. Repair or clean as needed.
  4. With ignition off, disconnect the valve connector and measure coil resistance across the valve pins. Compare to OEM specification or to the opposite side valve if possible.
  5. Check for short to ground or to battery using a multimeter between each valve pin and vehicle ground/battery positive.
  6. Backprobe the valve connector and command the valve using the diagnostic tool (actuator test). Measure voltage/pulse and confirm the ABS module is commanding the valve (observe duty cycle/current draw).
  7. Perform a wiggle test on harness while commanding the valve to detect intermittent faults.
  8. If wiring and connector tests are good but valve fails resistance or actuator test, replace the right rear discharge valve or hydraulic modulator assembly as required. If valve replacement is not separately available, replacement of the hydraulic unit may be necessary.
  9. If wiring and valve are good, inspect/replace ABS module or repair internal module faults only after confirming module commands and power/ground are correct. Consider module reprogramming or bench repair per OEM guidance.
  10. After repair, clear codes and perform a road test with diagnostics connected to confirm the fault is resolved and no new codes appear.

Likely causes

  • Damaged or corroded connector at the right rear discharge valve
  • Open or high resistance in the valve coil (wiring or valve)
  • Valve coil shorted to ground or to supply
  • Failed valve or hydraulic unit internal fault

Fault status

⚠️ Status
Right rear discharge valve circuit fault detected (electrical or functional issue in ABS hydraulic unit).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C001C C001E C0035 C0040 C0120
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Code

C001D

HYUNDAI C — Chassis

Right Rear Outlet Control (Subfault)

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 11 EN: 15 RU: 13
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short circuit in the right rear discharge valve wiring
  • Corroded, contaminated or loose connector at the valve or ABS modulator
  • Faulty right rear discharge valve (stuck, coil open/shorted)
  • Internal failure in the ABS/ESP hydraulic unit (modulator/pump assembly)
  • Poor ground or low battery/voltage supply to ABS module
  • Intermittent wiring fault (broken conductor, chaffed cable)

Symptoms

  • ABS and/or ESP warning lamp illuminated
  • Traction control/ESP disabled or limited functionality
  • ABS intervention may be absent or irregular during braking
  • Possible altered brake feel or pulsation under ABS activation
  • Stored fault code(s) related to ABS hydraulic valves

What to check

  • Read all stored and pending ABS/ESP codes with a capable scanner and record freeze frame data
  • Perform a visual inspection of the wiring harness and connectors at the right rear discharge valve and ABS hydraulic unit for damage or corrosion
  • Check battery voltage and fuses/relays related to ABS/ESP power supply
  • Measure resistance of the right rear discharge valve coil at the valve connector (with connector disconnected)
  • Check for continuity and shorts to ground/power between the valve connector and ABS control module connector
  • Use a diagnostic tool to perform an ABS/ESP actuator/solenoid test to confirm valve activation

Signal parameters

  • Supply voltage: approx. battery voltage (~12 V) at ABS module power feed; expect 11–14 V with engine on
  • Control signal: ABS module typically drives discharge valves with a PWM current/duty cycle; duty cycle ranges 0–100% depending on command
  • Typical PWM frequency: varies by manufacturer (commonly 50–200 Hz); consult OEM data
  • Valve coil resistance: typically low (example ranges 5–40 ohms) — consult Alfa Romeo OEM spec for exact value
  • Expected behavior during actuator test: measurable current draw and audible/physical valve activation; live-data duty cycle should change when commanded

Diagnostic algorithm

  1. Connect a professional diagnostic scanner and read all ABS/ESP codes and freeze frame data. Note any related codes.
  2. Clear codes and attempt to re-create the fault under conditions noted in freeze frame (safe road test or bench activation) to verify persistence.
  3. Visually inspect right rear discharge valve connector and wiring for damage, corrosion, water ingress, or pin deformation. Repair or clean as needed.
  4. With ignition off, disconnect the valve connector and measure coil resistance across the valve pins. Compare to OEM specification or to the opposite side valve if possible.
  5. Check for short to ground or to battery using a multimeter between each valve pin and vehicle ground/battery positive.
  6. Backprobe the valve connector and command the valve using the diagnostic tool (actuator test). Measure voltage/pulse and confirm the ABS module is commanding the valve (observe duty cycle/current draw).
  7. Perform a wiggle test on harness while commanding the valve to detect intermittent faults.
  8. If wiring and connector tests are good but valve fails resistance or actuator test, replace the right rear discharge valve or hydraulic modulator assembly as required. If valve replacement is not separately available, replacement of the hydraulic unit may be necessary.
  9. If wiring and valve are good, inspect/replace ABS module or repair internal module faults only after confirming module commands and power/ground are correct. Consider module reprogramming or bench repair per OEM guidance.
  10. After repair, clear codes and perform a road test with diagnostics connected to confirm the fault is resolved and no new codes appear.

Likely causes

  • Damaged or corroded connector at the right rear discharge valve
  • Open or high resistance in the valve coil (wiring or valve)
  • Valve coil shorted to ground or to supply
  • Failed valve or hydraulic unit internal fault

Fault status

⚠️ Status
Right rear discharge valve circuit fault detected (electrical or functional issue in ABS hydraulic unit).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C001C C001E C0035 C0040 C0120
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Code

C001D

LAND ROVER C — Chassis

Right rear exit control

Brand: LAND ROVER
Type: C — Chassis
Views: UK: 6 EN: 9 RU: 5
AI status
Completed
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Page language: EN

Causes

  • Open or short circuit in the right rear discharge valve wiring
  • Corroded, contaminated or loose connector at the valve or ABS modulator
  • Faulty right rear discharge valve (stuck, coil open/shorted)
  • Internal failure in the ABS/ESP hydraulic unit (modulator/pump assembly)
  • Poor ground or low battery/voltage supply to ABS module
  • Intermittent wiring fault (broken conductor, chaffed cable)

Symptoms

  • ABS and/or ESP warning lamp illuminated
  • Traction control/ESP disabled or limited functionality
  • ABS intervention may be absent or irregular during braking
  • Possible altered brake feel or pulsation under ABS activation
  • Stored fault code(s) related to ABS hydraulic valves

What to check

  • Read all stored and pending ABS/ESP codes with a capable scanner and record freeze frame data
  • Perform a visual inspection of the wiring harness and connectors at the right rear discharge valve and ABS hydraulic unit for damage or corrosion
  • Check battery voltage and fuses/relays related to ABS/ESP power supply
  • Measure resistance of the right rear discharge valve coil at the valve connector (with connector disconnected)
  • Check for continuity and shorts to ground/power between the valve connector and ABS control module connector
  • Use a diagnostic tool to perform an ABS/ESP actuator/solenoid test to confirm valve activation

Signal parameters

  • Supply voltage: approx. battery voltage (~12 V) at ABS module power feed; expect 11–14 V with engine on
  • Control signal: ABS module typically drives discharge valves with a PWM current/duty cycle; duty cycle ranges 0–100% depending on command
  • Typical PWM frequency: varies by manufacturer (commonly 50–200 Hz); consult OEM data
  • Valve coil resistance: typically low (example ranges 5–40 ohms) — consult Alfa Romeo OEM spec for exact value
  • Expected behavior during actuator test: measurable current draw and audible/physical valve activation; live-data duty cycle should change when commanded

Diagnostic algorithm

  1. Connect a professional diagnostic scanner and read all ABS/ESP codes and freeze frame data. Note any related codes.
  2. Clear codes and attempt to re-create the fault under conditions noted in freeze frame (safe road test or bench activation) to verify persistence.
  3. Visually inspect right rear discharge valve connector and wiring for damage, corrosion, water ingress, or pin deformation. Repair or clean as needed.
  4. With ignition off, disconnect the valve connector and measure coil resistance across the valve pins. Compare to OEM specification or to the opposite side valve if possible.
  5. Check for short to ground or to battery using a multimeter between each valve pin and vehicle ground/battery positive.
  6. Backprobe the valve connector and command the valve using the diagnostic tool (actuator test). Measure voltage/pulse and confirm the ABS module is commanding the valve (observe duty cycle/current draw).
  7. Perform a wiggle test on harness while commanding the valve to detect intermittent faults.
  8. If wiring and connector tests are good but valve fails resistance or actuator test, replace the right rear discharge valve or hydraulic modulator assembly as required. If valve replacement is not separately available, replacement of the hydraulic unit may be necessary.
  9. If wiring and valve are good, inspect/replace ABS module or repair internal module faults only after confirming module commands and power/ground are correct. Consider module reprogramming or bench repair per OEM guidance.
  10. After repair, clear codes and perform a road test with diagnostics connected to confirm the fault is resolved and no new codes appear.

Likely causes

  • Damaged or corroded connector at the right rear discharge valve
  • Open or high resistance in the valve coil (wiring or valve)
  • Valve coil shorted to ground or to supply
  • Failed valve or hydraulic unit internal fault

Fault status

⚠️ Status
Right rear discharge valve circuit fault detected (electrical or functional issue in ABS hydraulic unit).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C001C C001E C0035 C0040 C0120
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Contents
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Download
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