Code
C1243
HUMMER
C — Chassis
BPMV Pump Motor Stalled
Views:
UK: 16
EN: 25
RU: 16
AI status
Completed
Completed
100%
Causes
- Failed or seized pump motor (internal mechanical failure)
- Open or shorted wiring to pump motor
- Corroded or loose connector at pump motor
- Blown fuse or faulty pump relay
- Faulty ABS/ESC control module or driver circuit
- Hydraulic block or valves mechanically locked, preventing pump rotation
Symptoms
- ABS and/or traction/stability warning lamp illuminated
- ABS pump does not run or is unusually quiet when stability control activates
- Reduced or altered brake feel during ABS or ESC events
- Possible brake warning lamp if combined systems detect failure
- No pump noise during self-test or when commanded via scan tool
What to check
- Read and record all stored ABS/ESC fault codes and freeze frame data with a capable scan tool
- Verify battery voltage (should be ~12–14 V) and good battery condition
- Visually inspect pump electrical connector for corrosion, bent pins, water intrusion, or loose terminals
- Check related fuses and pump relay continuity and operation
- Command pump ON with scan tool while listening and observing for motor operation
- Back-probe pump power and ground while commanding to verify presence of supply voltage and switching
Signal parameters
- Supply voltage at pump when commanded: approximately vehicle battery voltage (~12 V); should be present at motor power terminal when activated
- Control signal: ABS/ESC module typically applies switched/pulsed power to motor — expect voltage switching rather than a steady low-voltage signal during activation
- Motor winding resistance: finite low resistance (continuity). An open circuit indicates wiring/motor open; a near short may indicate internal winding fault
- Current behavior: a running pump draws moderate to high current; a stalled motor may draw higher-than-normal current or no current if open/driver-limited. Use clamp meter to verify
- No voltage at pump when commanded suggests supply/fuse/relay or module driver fault
Diagnostic algorithm
- Connect a full-function scan tool, read all ABS/ESC DTCs and clear codes. Attempt to reproduce C1243 and note conditions (ignition state, wheel movement, self-test).
- Verify battery charge and system voltage. Low voltage can prevent pump operation; recharge or replace battery if needed before further testing.
- Inspect pump connector and wiring harness for damage, corrosion, chafing, or water entry. Repair any wiring issues.
- Check fuses and swap/test the pump relay (if externally fused/relayed). Replace suspect items.
- With vehicle stationary and wheels chocked, command the ABS pump ON via scan tool while an assistant monitors: listen for pump, feel for vibration, and observe pressure build if possible.
- Back-probe power and ground at the pump connector while commanding pump. Confirm battery voltage at the power terminal and a good ground. If voltage is present and pump does not run, suspect motor or mechanical seizure.
- Measure motor winding resistance (disconnect connector first). An open circuit => replace motor; very low resistance or shorted winding => replace motor.
- If power is absent at connector when commanded, trace wiring back to fuse/relay and ABS module. Check continuity and repair open/short circuits. Test relay and associated circuits.
- If wiring and power are good but motor does not run, remove and bench-test pump assembly (apply 12 V briefly with proper safety precautions) to confirm motor stall/seizure. Replace pump/hydraulic unit if it fails bench test.
- If bench test pump runs but stalls when installed, inspect ABS hydraulic block/valves for mechanical lock or internal restriction and consider replacing hydraulic assembly or valve block.
- If suspected ABS module driver failure and all wiring/pump checks OK, consider module reprogram/repair or replacement per manufacturer guidance.
- After repair or component replacement, clear codes, perform required system bleed/calibration procedures, and verify no reoccurrence through road test and scan-tool functional tests.
Likely causes
- Pump motor bearings seized or rotor locked by debris
- Open circuit or poor pin contact in pump motor connector
- Power supply fuse or relay failed
- ABS module driver transistor failed (no current to motor)
- Hydraulic side blockage causing excessive load and stall
Fault status
Status
BPMV pump motor stalled — ABS/ESC pump failed to operate when commanded. Possible electrical or mechanical pump failure or driver/wiring fault.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
C1243
HYUNDAI
C — Chassis
Front Left(FL) Height Sensor | Height Sensor - Front Left
Views:
UK: 18
EN: 24
RU: 20
AI status
Completed
Completed
100%
Causes
- Failed or seized pump motor (internal mechanical failure)
- Open or shorted wiring to pump motor
- Corroded or loose connector at pump motor
- Blown fuse or faulty pump relay
- Faulty ABS/ESC control module or driver circuit
- Hydraulic block or valves mechanically locked, preventing pump rotation
Symptoms
- ABS and/or traction/stability warning lamp illuminated
- ABS pump does not run or is unusually quiet when stability control activates
- Reduced or altered brake feel during ABS or ESC events
- Possible brake warning lamp if combined systems detect failure
- No pump noise during self-test or when commanded via scan tool
What to check
- Read and record all stored ABS/ESC fault codes and freeze frame data with a capable scan tool
- Verify battery voltage (should be ~12–14 V) and good battery condition
- Visually inspect pump electrical connector for corrosion, bent pins, water intrusion, or loose terminals
- Check related fuses and pump relay continuity and operation
- Command pump ON with scan tool while listening and observing for motor operation
- Back-probe pump power and ground while commanding to verify presence of supply voltage and switching
Signal parameters
- Supply voltage at pump when commanded: approximately vehicle battery voltage (~12 V); should be present at motor power terminal when activated
- Control signal: ABS/ESC module typically applies switched/pulsed power to motor — expect voltage switching rather than a steady low-voltage signal during activation
- Motor winding resistance: finite low resistance (continuity). An open circuit indicates wiring/motor open; a near short may indicate internal winding fault
- Current behavior: a running pump draws moderate to high current; a stalled motor may draw higher-than-normal current or no current if open/driver-limited. Use clamp meter to verify
- No voltage at pump when commanded suggests supply/fuse/relay or module driver fault
Diagnostic algorithm
- Connect a full-function scan tool, read all ABS/ESC DTCs and clear codes. Attempt to reproduce C1243 and note conditions (ignition state, wheel movement, self-test).
- Verify battery charge and system voltage. Low voltage can prevent pump operation; recharge or replace battery if needed before further testing.
- Inspect pump connector and wiring harness for damage, corrosion, chafing, or water entry. Repair any wiring issues.
- Check fuses and swap/test the pump relay (if externally fused/relayed). Replace suspect items.
- With vehicle stationary and wheels chocked, command the ABS pump ON via scan tool while an assistant monitors: listen for pump, feel for vibration, and observe pressure build if possible.
- Back-probe power and ground at the pump connector while commanding pump. Confirm battery voltage at the power terminal and a good ground. If voltage is present and pump does not run, suspect motor or mechanical seizure.
- Measure motor winding resistance (disconnect connector first). An open circuit => replace motor; very low resistance or shorted winding => replace motor.
- If power is absent at connector when commanded, trace wiring back to fuse/relay and ABS module. Check continuity and repair open/short circuits. Test relay and associated circuits.
- If wiring and power are good but motor does not run, remove and bench-test pump assembly (apply 12 V briefly with proper safety precautions) to confirm motor stall/seizure. Replace pump/hydraulic unit if it fails bench test.
- If bench test pump runs but stalls when installed, inspect ABS hydraulic block/valves for mechanical lock or internal restriction and consider replacing hydraulic assembly or valve block.
- If suspected ABS module driver failure and all wiring/pump checks OK, consider module reprogram/repair or replacement per manufacturer guidance.
- After repair or component replacement, clear codes, perform required system bleed/calibration procedures, and verify no reoccurrence through road test and scan-tool functional tests.
Likely causes
- Pump motor bearings seized or rotor locked by debris
- Open circuit or poor pin contact in pump motor connector
- Power supply fuse or relay failed
- ABS module driver transistor failed (no current to motor)
- Hydraulic side blockage causing excessive load and stall
Fault status
Status
BPMV pump motor stalled — ABS/ESC pump failed to operate when commanded. Possible electrical or mechanical pump failure or driver/wiring fault.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
C1243
Other
C — Chassis
ABS Outlet Valve Coil LR Circuit Open
Views:
UK: 23
EN: 31
RU: 26
AI status
Completed
Completed
100%
Causes
- Failed or seized pump motor (internal mechanical failure)
- Open or shorted wiring to pump motor
- Corroded or loose connector at pump motor
- Blown fuse or faulty pump relay
- Faulty ABS/ESC control module or driver circuit
- Hydraulic block or valves mechanically locked, preventing pump rotation
Symptoms
- ABS and/or traction/stability warning lamp illuminated
- ABS pump does not run or is unusually quiet when stability control activates
- Reduced or altered brake feel during ABS or ESC events
- Possible brake warning lamp if combined systems detect failure
- No pump noise during self-test or when commanded via scan tool
What to check
- Read and record all stored ABS/ESC fault codes and freeze frame data with a capable scan tool
- Verify battery voltage (should be ~12–14 V) and good battery condition
- Visually inspect pump electrical connector for corrosion, bent pins, water intrusion, or loose terminals
- Check related fuses and pump relay continuity and operation
- Command pump ON with scan tool while listening and observing for motor operation
- Back-probe pump power and ground while commanding to verify presence of supply voltage and switching
Signal parameters
- Supply voltage at pump when commanded: approximately vehicle battery voltage (~12 V); should be present at motor power terminal when activated
- Control signal: ABS/ESC module typically applies switched/pulsed power to motor — expect voltage switching rather than a steady low-voltage signal during activation
- Motor winding resistance: finite low resistance (continuity). An open circuit indicates wiring/motor open; a near short may indicate internal winding fault
- Current behavior: a running pump draws moderate to high current; a stalled motor may draw higher-than-normal current or no current if open/driver-limited. Use clamp meter to verify
- No voltage at pump when commanded suggests supply/fuse/relay or module driver fault
Diagnostic algorithm
- Connect a full-function scan tool, read all ABS/ESC DTCs and clear codes. Attempt to reproduce C1243 and note conditions (ignition state, wheel movement, self-test).
- Verify battery charge and system voltage. Low voltage can prevent pump operation; recharge or replace battery if needed before further testing.
- Inspect pump connector and wiring harness for damage, corrosion, chafing, or water entry. Repair any wiring issues.
- Check fuses and swap/test the pump relay (if externally fused/relayed). Replace suspect items.
- With vehicle stationary and wheels chocked, command the ABS pump ON via scan tool while an assistant monitors: listen for pump, feel for vibration, and observe pressure build if possible.
- Back-probe power and ground at the pump connector while commanding pump. Confirm battery voltage at the power terminal and a good ground. If voltage is present and pump does not run, suspect motor or mechanical seizure.
- Measure motor winding resistance (disconnect connector first). An open circuit => replace motor; very low resistance or shorted winding => replace motor.
- If power is absent at connector when commanded, trace wiring back to fuse/relay and ABS module. Check continuity and repair open/short circuits. Test relay and associated circuits.
- If wiring and power are good but motor does not run, remove and bench-test pump assembly (apply 12 V briefly with proper safety precautions) to confirm motor stall/seizure. Replace pump/hydraulic unit if it fails bench test.
- If bench test pump runs but stalls when installed, inspect ABS hydraulic block/valves for mechanical lock or internal restriction and consider replacing hydraulic assembly or valve block.
- If suspected ABS module driver failure and all wiring/pump checks OK, consider module reprogram/repair or replacement per manufacturer guidance.
- After repair or component replacement, clear codes, perform required system bleed/calibration procedures, and verify no reoccurrence through road test and scan-tool functional tests.
Likely causes
- Pump motor bearings seized or rotor locked by debris
- Open circuit or poor pin contact in pump motor connector
- Power supply fuse or relay failed
- ABS module driver transistor failed (no current to motor)
- Hydraulic side blockage causing excessive load and stall
Fault status
Status
BPMV pump motor stalled — ABS/ESC pump failed to operate when commanded. Possible electrical or mechanical pump failure or driver/wiring fault.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Workshop ManualYour experience will help others
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