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Home / DTC / P0577 — Cruise Control Input Circuit High

P0577 — Cruise Control Input Circuit High

Detailed page for trouble code P0577.

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23,694specific
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Code

P0577

Generic P — Powertrain

Cruise Control Input Circuit High

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty cruise control switch (ON/OFF, set, resume) or steering wheel module
  • Short to battery voltage (wiring harness pin shorted to +12V)
  • Poor or corroded connector or pin at the switch, clockspring, or PCM/BCM
  • Open or damaged wiring that allows the input to float to a high level
  • Faulty PCM/BCM or input circuit driver
  • Aftermarket equipment or poor repairs affecting steering-wheel wiring or clockspring

Symptoms

  • Malfunction Indicator Lamp (MIL) or CHECK ENGINE light ON
  • Cruise control inoperative or disabled
  • Cruise may not engage or may disengage immediately
  • Stored DTC P0577 and possibly related codes
  • Intermittent cruise operation if wiring breaks or shorts intermittently

What to check

  • Retrieve DTC(s) and freeze frame / live data with a scan tool
  • Verify vehicle-specific wiring diagram and identify the PCM/BCM pin for the cruise input
  • Visually inspect steering column, clockspring, switch connectors, and harness for damage, corrosion, pin push-out or aftermarket splices
  • Check fuses and power/ground circuits related to the cruise and steering wheel controls
  • Backprobe the cruise input with a multimeter/scan tool to monitor voltage while operating switches
  • Perform a wiggle test on the steering wheel, harness and connectors while monitoring the input

Signal parameters

  • Normal logic expected: approximately 0–1 V (low/ground) when active and ~4.5–5 V (high) when inactive on 5 V reference systems
  • Some vehicles may use battery voltage for the 'high' state (~12 V) — consult vehicle wiring diagram
  • High condition flagged when input voltage exceeds the controller's allowed threshold (typically >4.5 V on 5 V systems)
  • No or very low current draw expected for switch inputs (milliamps range)

Diagnostic algorithm

  1. Read and record stored codes and freeze-frame data; note whether only P0577 is present or other related codes.
  2. Review the vehicle wiring diagram to identify the cruise input wire, associated modules (steering wheel switches, clockspring, BCM/PCM), and any reference voltages.
  3. Visually inspect connectors, pins and wiring for damage, corrosion or aftermarket splices between the switch and the controller.
  4. With ignition ON (engine off), backprobe the cruise input at the switch and at the PCM pin. Observe idle/unpressed and pressed states while operating the switch. Compare voltages to expected signal parameters.
  5. If input reads high at the PCM but not at the switch, check continuity and resistance between the switch and PCM; look for short to battery (measure voltage to chassis ground at harness splice points).
  6. If the input is high at the switch connector, disconnect the switch and observe the input at the PCM; simulate the switch by grounding or applying the proper reference (per wiring diagram) to see if the PCM responds and the code clears.
  7. Repair any wiring faults (repair/replace damaged harness, connectors, or clockspring). Replace the cruise switch or steering wheel control module if found defective.
  8. If wiring and switch check good and the input remains high at the PCM, consider PCM/BCM input driver fault—verify with manufacturer-specific tests before replacement.
  9. After repairs, clear codes and perform a road test to confirm the cruise system operates and the code does not return.

Likely causes

  • Damaged/shorted wiring or connector at the cruise control switch or clockspring
  • Defective cruise control switch or steering wheel module
  • Short to battery voltage in the harness feeding the input
  • Failed PCM/BCM input driver (less common)

Fault status

⚠️ Status
Cruise Control Input Circuit High (P0577) - Cruise disabled; check cruise control switch, wiring and connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P0577

LAND ROVER P — Powertrain

Speed control input - high circuit

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty cruise control switch (ON/OFF, set, resume) or steering wheel module
  • Short to battery voltage (wiring harness pin shorted to +12V)
  • Poor or corroded connector or pin at the switch, clockspring, or PCM/BCM
  • Open or damaged wiring that allows the input to float to a high level
  • Faulty PCM/BCM or input circuit driver
  • Aftermarket equipment or poor repairs affecting steering-wheel wiring or clockspring

Symptoms

  • Malfunction Indicator Lamp (MIL) or CHECK ENGINE light ON
  • Cruise control inoperative or disabled
  • Cruise may not engage or may disengage immediately
  • Stored DTC P0577 and possibly related codes
  • Intermittent cruise operation if wiring breaks or shorts intermittently

What to check

  • Retrieve DTC(s) and freeze frame / live data with a scan tool
  • Verify vehicle-specific wiring diagram and identify the PCM/BCM pin for the cruise input
  • Visually inspect steering column, clockspring, switch connectors, and harness for damage, corrosion, pin push-out or aftermarket splices
  • Check fuses and power/ground circuits related to the cruise and steering wheel controls
  • Backprobe the cruise input with a multimeter/scan tool to monitor voltage while operating switches
  • Perform a wiggle test on the steering wheel, harness and connectors while monitoring the input

Signal parameters

  • Normal logic expected: approximately 0–1 V (low/ground) when active and ~4.5–5 V (high) when inactive on 5 V reference systems
  • Some vehicles may use battery voltage for the 'high' state (~12 V) — consult vehicle wiring diagram
  • High condition flagged when input voltage exceeds the controller's allowed threshold (typically >4.5 V on 5 V systems)
  • No or very low current draw expected for switch inputs (milliamps range)

Diagnostic algorithm

  1. Read and record stored codes and freeze-frame data; note whether only P0577 is present or other related codes.
  2. Review the vehicle wiring diagram to identify the cruise input wire, associated modules (steering wheel switches, clockspring, BCM/PCM), and any reference voltages.
  3. Visually inspect connectors, pins and wiring for damage, corrosion or aftermarket splices between the switch and the controller.
  4. With ignition ON (engine off), backprobe the cruise input at the switch and at the PCM pin. Observe idle/unpressed and pressed states while operating the switch. Compare voltages to expected signal parameters.
  5. If input reads high at the PCM but not at the switch, check continuity and resistance between the switch and PCM; look for short to battery (measure voltage to chassis ground at harness splice points).
  6. If the input is high at the switch connector, disconnect the switch and observe the input at the PCM; simulate the switch by grounding or applying the proper reference (per wiring diagram) to see if the PCM responds and the code clears.
  7. Repair any wiring faults (repair/replace damaged harness, connectors, or clockspring). Replace the cruise switch or steering wheel control module if found defective.
  8. If wiring and switch check good and the input remains high at the PCM, consider PCM/BCM input driver fault—verify with manufacturer-specific tests before replacement.
  9. After repairs, clear codes and perform a road test to confirm the cruise system operates and the code does not return.

Likely causes

  • Damaged/shorted wiring or connector at the cruise control switch or clockspring
  • Defective cruise control switch or steering wheel module
  • Short to battery voltage in the harness feeding the input
  • Failed PCM/BCM input driver (less common)

Fault status

⚠️ Status
Cruise Control Input Circuit High (P0577) - Cruise disabled; check cruise control switch, wiring and connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0576 P0562 P0563 U0121
413

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