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Home / DTC / C0022 — Brake Booster Solenoid

C0022 — Brake Booster Solenoid

Detailed page for trouble code C0022.

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11,914generic
22,491specific
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Code

C0022

Generic C — Chassis

Brake Booster Solenoid

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

Causes

  • Damaged or disconnected electrical connector/wiring to the brake booster solenoid
  • Open or shorted solenoid coil
  • Corroded terminals or poor ground connection
  • Blown fuse or relay supplying the solenoid circuit
  • Failed brake booster solenoid (mechanical or internal electrical failure)
  • Control module or ECU output driver fault

Symptoms

  • Brake warning lamp or ABS/ESC warning illuminated
  • Reduced or no brake assist leading to harder brake pedal
  • ABS/traction control faults or limited functionality
  • Intermittent assist or delayed pedal return
  • Stored C0022 fault repeats after clearing
  • Possible abnormal noises from the booster area if mechanical binding present

What to check

  • Read freeze frame and fault details with scan tool (conditions when fault set)
  • Visually inspect connectors, terminals and wiring to the booster solenoid for damage, corrosion, or looseness
  • Check fuses and relays for the brake/boost circuits
  • Verify battery voltage at ignition on and during cranking
  • Back-probe solenoid connector to measure supply voltage, ground and control signal with ignition on and while commanding the solenoid with a scan tool
  • Measure solenoid coil resistance with meter (compare to manufacturer spec)

Signal parameters

  • Typical supply voltage: battery voltage (~12 V) at ignition ON (may be switched via relay)
  • Ground: chassis ground or module-driven low-side switch
  • Control signal: switched +12 V or PWM/low-side driver from ABS/BCM (duty cycle varies by vehicle)
  • Expected coil resistance: typically 10–100 ohms (manufacturer-specific) — measure cold and compare to spec
  • Activation behavior: audible click or change in vacuum/pressure within 0.1–1.0 seconds when energized

Diagnostic algorithm

  1. Retrieve C0022 and any related codes. Record freeze frame and operating conditions when the code set.
  2. Perform visual inspection of connector, wiring harness and vacuum/pressure lines for damage, corrosion or disconnection.
  3. Check relevant fuses/relays and verify battery voltage at the solenoid connector with ignition ON.
  4. Back-probe the solenoid connector: verify correct supply voltage, ground and control signal while commanding the solenoid with a scan tool. Note presence/absence of PWM or switched voltage.
  5. With vehicle off, measure solenoid coil resistance. If resistance is open or shorted vs spec, replace solenoid.
  6. If electricals are correct but solenoid does not operate, apply bench 12 V (through a fused lead) to test mechanical operation (observe click and movement). Only do this if safe and recommended by manufacturer.

Likely causes

  • Wiring harness chafing near steering column or firewall causing intermittent short/open
  • Corroded connector pins at solenoid or module
  • Solenoid coil burned from over-voltage or water ingress
  • Failed ground at chassis or module mounting point
  • Blocked vacuum/pressure hose or check valve causing the solenoid to appear nonfunctional

Fault status

⚠️ Status
Brake Booster Solenoid: electrical or functional fault detected (open/short/intermittent or failed actuator).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

C0022

HYUNDAI C — Chassis

Brake Booster Solenoid (Subfault)

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

Causes

  • Damaged or disconnected electrical connector/wiring to the brake booster solenoid
  • Open or shorted solenoid coil
  • Corroded terminals or poor ground connection
  • Blown fuse or relay supplying the solenoid circuit
  • Failed brake booster solenoid (mechanical or internal electrical failure)
  • Control module or ECU output driver fault

Symptoms

  • Brake warning lamp or ABS/ESC warning illuminated
  • Reduced or no brake assist leading to harder brake pedal
  • ABS/traction control faults or limited functionality
  • Intermittent assist or delayed pedal return
  • Stored C0022 fault repeats after clearing
  • Possible abnormal noises from the booster area if mechanical binding present

What to check

  • Read freeze frame and fault details with scan tool (conditions when fault set)
  • Visually inspect connectors, terminals and wiring to the booster solenoid for damage, corrosion, or looseness
  • Check fuses and relays for the brake/boost circuits
  • Verify battery voltage at ignition on and during cranking
  • Back-probe solenoid connector to measure supply voltage, ground and control signal with ignition on and while commanding the solenoid with a scan tool
  • Measure solenoid coil resistance with meter (compare to manufacturer spec)

Signal parameters

  • Typical supply voltage: battery voltage (~12 V) at ignition ON (may be switched via relay)
  • Ground: chassis ground or module-driven low-side switch
  • Control signal: switched +12 V or PWM/low-side driver from ABS/BCM (duty cycle varies by vehicle)
  • Expected coil resistance: typically 10–100 ohms (manufacturer-specific) — measure cold and compare to spec
  • Activation behavior: audible click or change in vacuum/pressure within 0.1–1.0 seconds when energized

Diagnostic algorithm

  1. Retrieve C0022 and any related codes. Record freeze frame and operating conditions when the code set.
  2. Perform visual inspection of connector, wiring harness and vacuum/pressure lines for damage, corrosion or disconnection.
  3. Check relevant fuses/relays and verify battery voltage at the solenoid connector with ignition ON.
  4. Back-probe the solenoid connector: verify correct supply voltage, ground and control signal while commanding the solenoid with a scan tool. Note presence/absence of PWM or switched voltage.
  5. With vehicle off, measure solenoid coil resistance. If resistance is open or shorted vs spec, replace solenoid.
  6. If electricals are correct but solenoid does not operate, apply bench 12 V (through a fused lead) to test mechanical operation (observe click and movement). Only do this if safe and recommended by manufacturer.

Likely causes

  • Wiring harness chafing near steering column or firewall causing intermittent short/open
  • Corroded connector pins at solenoid or module
  • Solenoid coil burned from over-voltage or water ingress
  • Failed ground at chassis or module mounting point
  • Blocked vacuum/pressure hose or check valve causing the solenoid to appear nonfunctional

Fault status

⚠️ Status
Brake Booster Solenoid: electrical or functional fault detected (open/short/intermittent or failed actuator).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0020 C0021 C0023 P0555 P0556 P0571
371

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+100 karma for a short comment :)
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Code

C0022

LAND ROVER C — Chassis

Brake accelerator performance Throttle brake solenoid

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

Causes

  • Damaged or disconnected electrical connector/wiring to the brake booster solenoid
  • Open or shorted solenoid coil
  • Corroded terminals or poor ground connection
  • Blown fuse or relay supplying the solenoid circuit
  • Failed brake booster solenoid (mechanical or internal electrical failure)
  • Control module or ECU output driver fault

Symptoms

  • Brake warning lamp or ABS/ESC warning illuminated
  • Reduced or no brake assist leading to harder brake pedal
  • ABS/traction control faults or limited functionality
  • Intermittent assist or delayed pedal return
  • Stored C0022 fault repeats after clearing
  • Possible abnormal noises from the booster area if mechanical binding present

What to check

  • Read freeze frame and fault details with scan tool (conditions when fault set)
  • Visually inspect connectors, terminals and wiring to the booster solenoid for damage, corrosion, or looseness
  • Check fuses and relays for the brake/boost circuits
  • Verify battery voltage at ignition on and during cranking
  • Back-probe solenoid connector to measure supply voltage, ground and control signal with ignition on and while commanding the solenoid with a scan tool
  • Measure solenoid coil resistance with meter (compare to manufacturer spec)

Signal parameters

  • Typical supply voltage: battery voltage (~12 V) at ignition ON (may be switched via relay)
  • Ground: chassis ground or module-driven low-side switch
  • Control signal: switched +12 V or PWM/low-side driver from ABS/BCM (duty cycle varies by vehicle)
  • Expected coil resistance: typically 10–100 ohms (manufacturer-specific) — measure cold and compare to spec
  • Activation behavior: audible click or change in vacuum/pressure within 0.1–1.0 seconds when energized

Diagnostic algorithm

  1. Retrieve C0022 and any related codes. Record freeze frame and operating conditions when the code set.
  2. Perform visual inspection of connector, wiring harness and vacuum/pressure lines for damage, corrosion or disconnection.
  3. Check relevant fuses/relays and verify battery voltage at the solenoid connector with ignition ON.
  4. Back-probe the solenoid connector: verify correct supply voltage, ground and control signal while commanding the solenoid with a scan tool. Note presence/absence of PWM or switched voltage.
  5. With vehicle off, measure solenoid coil resistance. If resistance is open or shorted vs spec, replace solenoid.
  6. If electricals are correct but solenoid does not operate, apply bench 12 V (through a fused lead) to test mechanical operation (observe click and movement). Only do this if safe and recommended by manufacturer.

Likely causes

  • Wiring harness chafing near steering column or firewall causing intermittent short/open
  • Corroded connector pins at solenoid or module
  • Solenoid coil burned from over-voltage or water ingress
  • Failed ground at chassis or module mounting point
  • Blocked vacuum/pressure hose or check valve causing the solenoid to appear nonfunctional

Fault status

⚠️ Status
Brake Booster Solenoid: electrical or functional fault detected (open/short/intermittent or failed actuator).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0020 C0021 C0023 P0555 P0556 P0571
320

Browse 320 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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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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