Code
C0577
Generic
C — Chassis
Brake Pressure Sensor D Circuit/Open
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the sensor D signal, power, or ground circuit
- Corroded, loose or damaged connector at the sensor or module
- Failed or shorted brake pressure sensor D
- Water intrusion or contamination in connector
- Poor or missing ground at sensor circuit
- Intermittent connection due to chafed wiring or pin damage
Symptoms
- ABS or traction control warning lamp illuminated
- Brake warning lamp or message may be displayed
- Loss of ABS/traction control functionality; brakes may revert to non-ABS operation
- Possible inconsistent or no brake pressure readings in scan tool live data for sensor D
- Fault present on scan tool and may be stored with freeze-frame data
What to check
- Retrieve freeze-frame and live data with a scan tool; confirm C0577 is current or pending
- Visually inspect the sensor D connector and wiring for damage, corrosion, or water entry
- Wiggle test wiring and connectors while monitoring live data or DTC status for intermittent changes
- Back-probe sensor connector to verify reference voltage, signal voltage, and ground presence with key on
- Measure continuity between the sensor connector and the control module pin with ignition off
- Check for short to battery voltage or short to ground on the signal circuit
Signal parameters
- Reference voltage typically supplied by module (commonly 5 V) — verify with vehicle spec
- Signal output is an analog voltage proportional to brake pressure (example range ~0.5–4.5 V depending on pressure)
- Sensor impedance should be within manufacturer spec; open circuit shows infinite resistance
- No signal (open) or fixed voltage (short to power/ground) compared against live-data expected ramp with pressure change
Diagnostic algorithm
- Use a scan tool to confirm C0577 and note any related codes. Record live data for brake pressure sensor D.
- Visually inspect harness and connector at sensor D for corrosion, bent pins, damage, or water intrusion; repair or clean as necessary.
- With ignition on (engine off unless specified), back-probe connector: verify reference voltage and good ground at the connector per vehicle specifications.
- Measure signal voltage while applying brake pressure (or using hydraulic pressure tool) and watch for a corresponding change in the signal. If no change, proceed.
- With ignition off, check continuity between sensor signal/ground/power pins and the corresponding module pins. Repair any open circuits.
- Check for shorts: measure resistance from signal wire to battery (+) and to ground. Low resistance indicates short to power/ground respectively.
- If wiring and connections are good but signal is absent or out of range, replace the brake pressure sensor D.
- After repair, clear codes, re-check with scan tool, and road-test to confirm the fault does not return.
- If the fault persists with a known-good sensor and wiring, consider module input fault and refer to manufacturer diagnostics for control module testing.
Likely causes
- Bent or pushed-out terminal in the sensor connector causing an open circuit
- Chafed harness where wires have broken under insulation
- Corroded connector terminals allowing intermittent/open signal
- Sensor failed internally and no longer produces a signal
- Connector contaminated with moisture causing open or high-resistance connection
Fault status
Status
Brake Pressure Sensor D Circuit/Open — control module detects an open or interrupted electrical circuit for brake pressure sensor D.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
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Code
C0577
HUMMER
C — Chassis
Left Front Solenoid Circuit Low
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the sensor D signal, power, or ground circuit
- Corroded, loose or damaged connector at the sensor or module
- Failed or shorted brake pressure sensor D
- Water intrusion or contamination in connector
- Poor or missing ground at sensor circuit
- Intermittent connection due to chafed wiring or pin damage
Symptoms
- ABS or traction control warning lamp illuminated
- Brake warning lamp or message may be displayed
- Loss of ABS/traction control functionality; brakes may revert to non-ABS operation
- Possible inconsistent or no brake pressure readings in scan tool live data for sensor D
- Fault present on scan tool and may be stored with freeze-frame data
What to check
- Retrieve freeze-frame and live data with a scan tool; confirm C0577 is current or pending
- Visually inspect the sensor D connector and wiring for damage, corrosion, or water entry
- Wiggle test wiring and connectors while monitoring live data or DTC status for intermittent changes
- Back-probe sensor connector to verify reference voltage, signal voltage, and ground presence with key on
- Measure continuity between the sensor connector and the control module pin with ignition off
- Check for short to battery voltage or short to ground on the signal circuit
Signal parameters
- Reference voltage typically supplied by module (commonly 5 V) — verify with vehicle spec
- Signal output is an analog voltage proportional to brake pressure (example range ~0.5–4.5 V depending on pressure)
- Sensor impedance should be within manufacturer spec; open circuit shows infinite resistance
- No signal (open) or fixed voltage (short to power/ground) compared against live-data expected ramp with pressure change
Diagnostic algorithm
- Use a scan tool to confirm C0577 and note any related codes. Record live data for brake pressure sensor D.
- Visually inspect harness and connector at sensor D for corrosion, bent pins, damage, or water intrusion; repair or clean as necessary.
- With ignition on (engine off unless specified), back-probe connector: verify reference voltage and good ground at the connector per vehicle specifications.
- Measure signal voltage while applying brake pressure (or using hydraulic pressure tool) and watch for a corresponding change in the signal. If no change, proceed.
- With ignition off, check continuity between sensor signal/ground/power pins and the corresponding module pins. Repair any open circuits.
- Check for shorts: measure resistance from signal wire to battery (+) and to ground. Low resistance indicates short to power/ground respectively.
- If wiring and connections are good but signal is absent or out of range, replace the brake pressure sensor D.
- After repair, clear codes, re-check with scan tool, and road-test to confirm the fault does not return.
- If the fault persists with a known-good sensor and wiring, consider module input fault and refer to manufacturer diagnostics for control module testing.
Likely causes
- Bent or pushed-out terminal in the sensor connector causing an open circuit
- Chafed harness where wires have broken under insulation
- Corroded connector terminals allowing intermittent/open signal
- Sensor failed internally and no longer produces a signal
- Connector contaminated with moisture causing open or high-resistance connection
Fault status
Status
Brake Pressure Sensor D Circuit/Open — control module detects an open or interrupted electrical circuit for brake pressure sensor D.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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