Code
C0588
Generic
C — Chassis
Brake Booster Motor A Position Sensor Circuit Low
Views:
UK: 17
EN: 36
RU: 20
AI status
Completed
Completed
100%
Causes
- Damaged or shorted wiring in the position sensor circuit (short to ground).
- Corroded, loose, or damaged sensor connector or terminals.
- Faulty Brake Booster Motor A position sensor (internal failure).
- Failed brake booster motor assembly or internal wiring fault.
- Blown sensor reference fuse or loss of reference voltage from control module.
- Faulty body/ABS/ECU receiving the sensor signal (rare).
Symptoms
- ABS/traction/brake system warning lamp on.
- Reduced or degraded power brake assist (electric booster) or limp mode for brake assist.
- Brake pedal feel abnormal or inconsistent.
- Logged DTC C0588 in scan tool with related braking faults.
What to check
- Read fault code and freeze frame data with a scan tool; note ignition state and vehicle speed.
- Visually inspect wiring harness and connector at brake booster motor for damage, corrosion, pin push-out, or water ingress.
- Back-probe sensor connector and measure reference voltage and ground with ignition on.
- Using a lab scope or multimeter, monitor the sensor output while moving the booster input (or with pedal travel) to see if signal changes.
- Check for related fuses and module grounds; wiggle harness while monitoring live data to reproduce the fault.
- Clear codes after repairs and perform a controlled road test or actuator test per manufacturer procedure.
Signal parameters
- Typical sensor supply/reference voltage: ~5.0 V (verify to OEM spec).
- Expected sensor output: approximate linear range 0.5–4.5 V proportional to booster position; signal considered 'low' when below ~0.2–0.3 V (OEM-specific).
- At rest, some designs show a defined idle voltage — compare to OEM expected value.
- Continuity: signal and ground circuits should show low resistance (
Diagnostic algorithm
- Retrieve DTC details and freeze frame/registers with a scan tool; note stored conditions. 2) Visually inspect the brake booster motor and harness; repair/secure any visible damage. 3) With ignition ON (engine off), back-probe the sensor connector: verify reference voltage and ground presence. 4) Measure sensor output voltage; if low or 0 V, check for short to ground on signal wire between sensor and module. 5) If wiring appears intact, wiggle harness while monitoring signal for intermittent faults. 6) If wiring tests good, bench-test or apply OEM actuator test (if available) to command the booster motor and observe position sensor response. 7) Replace the position sensor or brake booster motor assembly if the sensor output fails or is out of specification. 8) After repair, clear codes and perform functional/road test; verify no reoccurrence and that related systems operate normally.
Likely causes
- Open or shorted sensor ground or signal wire (most common).
- Corroded connector at booster or module.
- Failed position sensor within brake booster motor assembly.
Fault status
Status
Brake Booster Motor A position sensor signal below expected threshold (circuit low) stored by control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
C0588
HUMMER
C — Chassis
Left Rear Solenoid Circuit High
Views:
UK: 14
EN: 11
RU: 12
AI status
Completed
Completed
100%
Causes
- Damaged or shorted wiring in the position sensor circuit (short to ground).
- Corroded, loose, or damaged sensor connector or terminals.
- Faulty Brake Booster Motor A position sensor (internal failure).
- Failed brake booster motor assembly or internal wiring fault.
- Blown sensor reference fuse or loss of reference voltage from control module.
- Faulty body/ABS/ECU receiving the sensor signal (rare).
Symptoms
- ABS/traction/brake system warning lamp on.
- Reduced or degraded power brake assist (electric booster) or limp mode for brake assist.
- Brake pedal feel abnormal or inconsistent.
- Logged DTC C0588 in scan tool with related braking faults.
What to check
- Read fault code and freeze frame data with a scan tool; note ignition state and vehicle speed.
- Visually inspect wiring harness and connector at brake booster motor for damage, corrosion, pin push-out, or water ingress.
- Back-probe sensor connector and measure reference voltage and ground with ignition on.
- Using a lab scope or multimeter, monitor the sensor output while moving the booster input (or with pedal travel) to see if signal changes.
- Check for related fuses and module grounds; wiggle harness while monitoring live data to reproduce the fault.
- Clear codes after repairs and perform a controlled road test or actuator test per manufacturer procedure.
Signal parameters
- Typical sensor supply/reference voltage: ~5.0 V (verify to OEM spec).
- Expected sensor output: approximate linear range 0.5–4.5 V proportional to booster position; signal considered 'low' when below ~0.2–0.3 V (OEM-specific).
- At rest, some designs show a defined idle voltage — compare to OEM expected value.
- Continuity: signal and ground circuits should show low resistance (
Diagnostic algorithm
- Retrieve DTC details and freeze frame/registers with a scan tool; note stored conditions. 2) Visually inspect the brake booster motor and harness; repair/secure any visible damage. 3) With ignition ON (engine off), back-probe the sensor connector: verify reference voltage and ground presence. 4) Measure sensor output voltage; if low or 0 V, check for short to ground on signal wire between sensor and module. 5) If wiring appears intact, wiggle harness while monitoring signal for intermittent faults. 6) If wiring tests good, bench-test or apply OEM actuator test (if available) to command the booster motor and observe position sensor response. 7) Replace the position sensor or brake booster motor assembly if the sensor output fails or is out of specification. 8) After repair, clear codes and perform functional/road test; verify no reoccurrence and that related systems operate normally.
Likely causes
- Open or shorted sensor ground or signal wire (most common).
- Corroded connector at booster or module.
- Failed position sensor within brake booster motor assembly.
Fault status
Status
Brake Booster Motor A position sensor signal below expected threshold (circuit low) stored by control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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HTML ManualYour experience will help others
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