Code
C0589
Generic
C — Chassis
Brake Booster Motor A Position Sensor Circuit High
Views:
UK: 22
EN: 26
RU: 27
AI status
Completed
Completed
100%
Causes
- Short to battery (positive) on the position sensor signal wire
- Faulty/failed brake booster motor A position sensor (open/internally shorted)
- Corroded, damaged, or loose connector at the sensor or control module
- Broken insulation allowing contact with 12V conductor or accessory circuits
- Poor or missing ground at sensor reference/ground circuit causing floating voltages
- Faulty ABS/Brake control module or internal driver circuitry (less common)
Symptoms
- Brake warning lamp or ABS/ESC warning lamp illuminated
- Reduced or altered brake assist feel (harder pedal) if booster motor/actuator affected
- Stored/active DTC C0589 in ABS/Brake control module
- Possible limp/limited brake-assist mode depending on vehicle strategy
- No-change or frozen sensor value in scan tool live data (stuck high)
What to check
- Read and record freeze frame and related DTCs with a scan tool; note conditions when code set
- Visual inspection of wiring harness and connectors at brake booster motor, sensor, and control module for damage/corrosion
- Check for recent service or modifications near the harness that might have disturbed wires
- Verify relevant fuses and power supplies for brake/ABS system
- Using a DVOM or oscilloscope, backprobe the sensor connector and check reference voltage, signal voltage, and ground with ignition ON (do not start)
Signal parameters
- Reference voltage: typically 5.0 V (nominal) from control module (verify with vehicle wiring diagram)
- Expected sensor output: normally within ~0.1–4.9 V across full travel; typical valid range ~0.5–4.5 V depending on design
- Circuit‑high threshold: usually >4.7–4.9 V or equal to battery voltage when code stores (varies by manufacturer)
- Signal should change smoothly as booster motor/actuator moves; a stuck/high constant indicates fault
Diagnostic algorithm
- Retrieve DTC details and related codes; note freeze frame data and vehicle conditions when set.
- Perform a careful visual inspection of harness, connector, and sensor at the brake booster for damage, corrosion, or moisture; repair any obvious faults.
- With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (≈5V), sensor output voltage (should be within expected range), and ground continuity. Record values.
- If signal voltage is high (>4.7V): disconnect the sensor connector. If the high voltage disappears at the connector on the harness side, suspect short to battery upstream or a module issue. If it remains high with sensor disconnected, check wiring for short to 12V and inspect harness continuity to the control module.
- Wiggle harness and operate steering/brake components while monitoring signal for intermittent shorts. Check for pin-to-pin shorts between signal and ignition power circuits.
- Measure resistance/continuity between sensor signal and control module input using wiring diagram to verify no open/shorts. Inspect connector pins for oxide or bent pins and repair/replace as needed.
- If wiring and connectors are good, bench-check or replace the position sensor and verify proper output across travel. Re-test with new sensor installed.
- If sensor replacement does not clear the issue and wiring is verified, suspect internal control module driver failure—consult manufacturer procedures before replacing module.
- After repairs, clear codes and perform road/operation test to confirm code does not return and sensor signal behaves normally.
- Document repairs and recheck all related systems for proper operation.
Likely causes
- Damaged harness near the brake booster or along routing (chafing, pinched)
- Connector corrosion or bent pins at sensor or module
- Sensor internal electronics failed and output stuck high
- Aftermarket equipment or recent work disturbed wiring (repair error)
- Intermittent short to battery when steering/brake components move
Fault status
Status
Brake Booster Motor A Position Sensor Circuit High — sensor output voltage above allowable threshold. Possible short to battery, sensor failure, or wiring/connective fault. May trigger brake/ABS warning and affect brake assist.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
C0589
HUMMER
C — Chassis
Left Rear Solenoid Circuit Open
Views:
UK: 10
EN: 15
RU: 16
AI status
Completed
Completed
100%
Causes
- Short to battery (positive) on the position sensor signal wire
- Faulty/failed brake booster motor A position sensor (open/internally shorted)
- Corroded, damaged, or loose connector at the sensor or control module
- Broken insulation allowing contact with 12V conductor or accessory circuits
- Poor or missing ground at sensor reference/ground circuit causing floating voltages
- Faulty ABS/Brake control module or internal driver circuitry (less common)
Symptoms
- Brake warning lamp or ABS/ESC warning lamp illuminated
- Reduced or altered brake assist feel (harder pedal) if booster motor/actuator affected
- Stored/active DTC C0589 in ABS/Brake control module
- Possible limp/limited brake-assist mode depending on vehicle strategy
- No-change or frozen sensor value in scan tool live data (stuck high)
What to check
- Read and record freeze frame and related DTCs with a scan tool; note conditions when code set
- Visual inspection of wiring harness and connectors at brake booster motor, sensor, and control module for damage/corrosion
- Check for recent service or modifications near the harness that might have disturbed wires
- Verify relevant fuses and power supplies for brake/ABS system
- Using a DVOM or oscilloscope, backprobe the sensor connector and check reference voltage, signal voltage, and ground with ignition ON (do not start)
Signal parameters
- Reference voltage: typically 5.0 V (nominal) from control module (verify with vehicle wiring diagram)
- Expected sensor output: normally within ~0.1–4.9 V across full travel; typical valid range ~0.5–4.5 V depending on design
- Circuit‑high threshold: usually >4.7–4.9 V or equal to battery voltage when code stores (varies by manufacturer)
- Signal should change smoothly as booster motor/actuator moves; a stuck/high constant indicates fault
Diagnostic algorithm
- Retrieve DTC details and related codes; note freeze frame data and vehicle conditions when set.
- Perform a careful visual inspection of harness, connector, and sensor at the brake booster for damage, corrosion, or moisture; repair any obvious faults.
- With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (≈5V), sensor output voltage (should be within expected range), and ground continuity. Record values.
- If signal voltage is high (>4.7V): disconnect the sensor connector. If the high voltage disappears at the connector on the harness side, suspect short to battery upstream or a module issue. If it remains high with sensor disconnected, check wiring for short to 12V and inspect harness continuity to the control module.
- Wiggle harness and operate steering/brake components while monitoring signal for intermittent shorts. Check for pin-to-pin shorts between signal and ignition power circuits.
- Measure resistance/continuity between sensor signal and control module input using wiring diagram to verify no open/shorts. Inspect connector pins for oxide or bent pins and repair/replace as needed.
- If wiring and connectors are good, bench-check or replace the position sensor and verify proper output across travel. Re-test with new sensor installed.
- If sensor replacement does not clear the issue and wiring is verified, suspect internal control module driver failure—consult manufacturer procedures before replacing module.
- After repairs, clear codes and perform road/operation test to confirm code does not return and sensor signal behaves normally.
- Document repairs and recheck all related systems for proper operation.
Likely causes
- Damaged harness near the brake booster or along routing (chafing, pinched)
- Connector corrosion or bent pins at sensor or module
- Sensor internal electronics failed and output stuck high
- Aftermarket equipment or recent work disturbed wiring (repair error)
- Intermittent short to battery when steering/brake components move
Fault status
Status
Brake Booster Motor A Position Sensor Circuit High — sensor output voltage above allowable threshold. Possible short to battery, sensor failure, or wiring/connective fault. May trigger brake/ABS warning and affect brake assist.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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