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Home / DTC / P0575 — Cruise Control Input Circuit

P0575 — Cruise Control Input Circuit

Detailed page for trouble code P0575.

34,405codes
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11,914generic
22,491specific
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Code

P0575

Generic P — Powertrain

Cruise Control Input Circuit

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

Causes

  • Faulty cruise control/steering-wheel switch or module
  • Open or shorted wiring between switch and PCM/BCM
  • Corroded, loose or damaged connector at the switch or module
  • Blown fuse or poor power/ground to the circuit
  • Water intrusion or damaged insulation at the steering column
  • Faulty PCM/BCM or internal input driver (less common)

Symptoms

  • Cruise control does not engage or cannot be set
  • Cruise control intermittently cancels or will not resume
  • Malfunction Indicator Lamp (MIL) or cruise warning message on dash
  • No response from cruise control switch inputs when monitored with a scan tool

What to check

  • Retrieve DTC(s) and freeze frame data with a scan tool; note related codes
  • Visually inspect fuses and relays for the cruise control system
  • Inspect connectors and wiring at the cruise switch, steering column, and PCM/BCM for damage, corrosion or looseness
  • Operate the cruise switch while watching live data to confirm signal changes (or lack thereof)
  • Backprobe the input circuit at the switch and at the PCM/BCM to compare voltages and continuity
  • Perform a wiggle test on the harness while observing the input signal for intermittent faults

Signal parameters

  • Typical input behavior: a switched logic signal that changes state when the cruise switch is pressed (either pulled to ground or to a reference voltage)
  • Common voltage levels: 0 V (ground state), ~5 V (logic reference) or battery voltage (~12 V) depending on vehicle design
  • When switch is open: steady reference voltage (commonly ~5 V) or battery voltage; when closed: pulled to ground (~0 V) or vice versa
  • Closed-switch resistance: near 0 ohms; open-switch = infinite/very high resistance

Diagnostic algorithm

  1. Verify P0575 and any other stored codes; record freeze frame and live data. Note whether the input appears stuck high/low or intermittent.
  2. Check related fuses and power/ground for the cruise system; replace blown fuses and retest.
  3. Visually inspect the steering-wheel switch assembly, clock spring, and harness for damage, corrosion, or water intrusion. Repair visible damage.
  4. Using a DVOM or scope, backprobe the cruise input at the switch and at the PCM/BCM. With key ON, observe resting voltage; operate the switch and verify the expected change in voltage/state.
  5. If the input doesn’t change at the switch, remove the switch and bench-test or substitute a known-good switch. If switch tests good, check continuity and resistance from the switch connector to the PCM/BCM pin(s).
  6. If continuity is OK at rest but signal changes intermittently, perform a wiggle/stress test along the harness (steering column flex) while monitoring the input to find intermittent breaks.
  7. If a short to power or ground is suspected, isolate the circuit and measure resistance to power/ground with connectors disconnected to locate short location.
  8. Repair or replace the faulty wiring, connector, clock spring, or cruise switch as found. If wiring and switch check good but input driver at PCM/BCM is faulty, consider module replacement or manufacturer guidance.
  9. Clear codes, perform function test and road test to confirm repair. Re-scan for codes after test drive.

Likely causes

  • Faulty cruise control switch in steering wheel
  • Open/short in harness at steering column (wire chaffing or broken pin)
  • Corroded/loose connector at the PCM/BCM or switch
  • Blown fuse or missing power/ground to the input circuit

Fault status

⚠️ Status
Cruise control unavailable — electrical input fault (P0575). Service required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

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P0571 P0572 P0573 P0576 U0121
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Code

P0575

GWM P — Powertrain

- Cruise control system malfunction

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

Causes

  • Faulty cruise control/steering-wheel switch or module
  • Open or shorted wiring between switch and PCM/BCM
  • Corroded, loose or damaged connector at the switch or module
  • Blown fuse or poor power/ground to the circuit
  • Water intrusion or damaged insulation at the steering column
  • Faulty PCM/BCM or internal input driver (less common)

Symptoms

  • Cruise control does not engage or cannot be set
  • Cruise control intermittently cancels or will not resume
  • Malfunction Indicator Lamp (MIL) or cruise warning message on dash
  • No response from cruise control switch inputs when monitored with a scan tool

What to check

  • Retrieve DTC(s) and freeze frame data with a scan tool; note related codes
  • Visually inspect fuses and relays for the cruise control system
  • Inspect connectors and wiring at the cruise switch, steering column, and PCM/BCM for damage, corrosion or looseness
  • Operate the cruise switch while watching live data to confirm signal changes (or lack thereof)
  • Backprobe the input circuit at the switch and at the PCM/BCM to compare voltages and continuity
  • Perform a wiggle test on the harness while observing the input signal for intermittent faults

Signal parameters

  • Typical input behavior: a switched logic signal that changes state when the cruise switch is pressed (either pulled to ground or to a reference voltage)
  • Common voltage levels: 0 V (ground state), ~5 V (logic reference) or battery voltage (~12 V) depending on vehicle design
  • When switch is open: steady reference voltage (commonly ~5 V) or battery voltage; when closed: pulled to ground (~0 V) or vice versa
  • Closed-switch resistance: near 0 ohms; open-switch = infinite/very high resistance

Diagnostic algorithm

  1. Verify P0575 and any other stored codes; record freeze frame and live data. Note whether the input appears stuck high/low or intermittent.
  2. Check related fuses and power/ground for the cruise system; replace blown fuses and retest.
  3. Visually inspect the steering-wheel switch assembly, clock spring, and harness for damage, corrosion, or water intrusion. Repair visible damage.
  4. Using a DVOM or scope, backprobe the cruise input at the switch and at the PCM/BCM. With key ON, observe resting voltage; operate the switch and verify the expected change in voltage/state.
  5. If the input doesn’t change at the switch, remove the switch and bench-test or substitute a known-good switch. If switch tests good, check continuity and resistance from the switch connector to the PCM/BCM pin(s).
  6. If continuity is OK at rest but signal changes intermittently, perform a wiggle/stress test along the harness (steering column flex) while monitoring the input to find intermittent breaks.
  7. If a short to power or ground is suspected, isolate the circuit and measure resistance to power/ground with connectors disconnected to locate short location.
  8. Repair or replace the faulty wiring, connector, clock spring, or cruise switch as found. If wiring and switch check good but input driver at PCM/BCM is faulty, consider module replacement or manufacturer guidance.
  9. Clear codes, perform function test and road test to confirm repair. Re-scan for codes after test drive.

Likely causes

  • Faulty cruise control switch in steering wheel
  • Open/short in harness at steering column (wire chaffing or broken pin)
  • Corroded/loose connector at the PCM/BCM or switch
  • Blown fuse or missing power/ground to the input circuit

Fault status

⚠️ Status
Cruise control unavailable — electrical input fault (P0575). Service required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

P0571 P0572 P0573 P0576 U0121
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Code

P0575

HUMMER P — Powertrain

Cruise Control Related Malfunction

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

Causes

  • Faulty cruise control/steering-wheel switch or module
  • Open or shorted wiring between switch and PCM/BCM
  • Corroded, loose or damaged connector at the switch or module
  • Blown fuse or poor power/ground to the circuit
  • Water intrusion or damaged insulation at the steering column
  • Faulty PCM/BCM or internal input driver (less common)

Symptoms

  • Cruise control does not engage or cannot be set
  • Cruise control intermittently cancels or will not resume
  • Malfunction Indicator Lamp (MIL) or cruise warning message on dash
  • No response from cruise control switch inputs when monitored with a scan tool

What to check

  • Retrieve DTC(s) and freeze frame data with a scan tool; note related codes
  • Visually inspect fuses and relays for the cruise control system
  • Inspect connectors and wiring at the cruise switch, steering column, and PCM/BCM for damage, corrosion or looseness
  • Operate the cruise switch while watching live data to confirm signal changes (or lack thereof)
  • Backprobe the input circuit at the switch and at the PCM/BCM to compare voltages and continuity
  • Perform a wiggle test on the harness while observing the input signal for intermittent faults

Signal parameters

  • Typical input behavior: a switched logic signal that changes state when the cruise switch is pressed (either pulled to ground or to a reference voltage)
  • Common voltage levels: 0 V (ground state), ~5 V (logic reference) or battery voltage (~12 V) depending on vehicle design
  • When switch is open: steady reference voltage (commonly ~5 V) or battery voltage; when closed: pulled to ground (~0 V) or vice versa
  • Closed-switch resistance: near 0 ohms; open-switch = infinite/very high resistance

Diagnostic algorithm

  1. Verify P0575 and any other stored codes; record freeze frame and live data. Note whether the input appears stuck high/low or intermittent.
  2. Check related fuses and power/ground for the cruise system; replace blown fuses and retest.
  3. Visually inspect the steering-wheel switch assembly, clock spring, and harness for damage, corrosion, or water intrusion. Repair visible damage.
  4. Using a DVOM or scope, backprobe the cruise input at the switch and at the PCM/BCM. With key ON, observe resting voltage; operate the switch and verify the expected change in voltage/state.
  5. If the input doesn’t change at the switch, remove the switch and bench-test or substitute a known-good switch. If switch tests good, check continuity and resistance from the switch connector to the PCM/BCM pin(s).
  6. If continuity is OK at rest but signal changes intermittently, perform a wiggle/stress test along the harness (steering column flex) while monitoring the input to find intermittent breaks.
  7. If a short to power or ground is suspected, isolate the circuit and measure resistance to power/ground with connectors disconnected to locate short location.
  8. Repair or replace the faulty wiring, connector, clock spring, or cruise switch as found. If wiring and switch check good but input driver at PCM/BCM is faulty, consider module replacement or manufacturer guidance.
  9. Clear codes, perform function test and road test to confirm repair. Re-scan for codes after test drive.

Likely causes

  • Faulty cruise control switch in steering wheel
  • Open/short in harness at steering column (wire chaffing or broken pin)
  • Corroded/loose connector at the PCM/BCM or switch
  • Blown fuse or missing power/ground to the input circuit

Fault status

⚠️ Status
Cruise control unavailable — electrical input fault (P0575). Service required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

P0571 P0572 P0573 P0576 U0121
Repair manuals

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Code

P0575

MERCEDES-BENZ P — Powertrain

Cruise Control Related Malfunction

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty cruise control/steering-wheel switch or module
  • Open or shorted wiring between switch and PCM/BCM
  • Corroded, loose or damaged connector at the switch or module
  • Blown fuse or poor power/ground to the circuit
  • Water intrusion or damaged insulation at the steering column
  • Faulty PCM/BCM or internal input driver (less common)

Symptoms

  • Cruise control does not engage or cannot be set
  • Cruise control intermittently cancels or will not resume
  • Malfunction Indicator Lamp (MIL) or cruise warning message on dash
  • No response from cruise control switch inputs when monitored with a scan tool

What to check

  • Retrieve DTC(s) and freeze frame data with a scan tool; note related codes
  • Visually inspect fuses and relays for the cruise control system
  • Inspect connectors and wiring at the cruise switch, steering column, and PCM/BCM for damage, corrosion or looseness
  • Operate the cruise switch while watching live data to confirm signal changes (or lack thereof)
  • Backprobe the input circuit at the switch and at the PCM/BCM to compare voltages and continuity
  • Perform a wiggle test on the harness while observing the input signal for intermittent faults

Signal parameters

  • Typical input behavior: a switched logic signal that changes state when the cruise switch is pressed (either pulled to ground or to a reference voltage)
  • Common voltage levels: 0 V (ground state), ~5 V (logic reference) or battery voltage (~12 V) depending on vehicle design
  • When switch is open: steady reference voltage (commonly ~5 V) or battery voltage; when closed: pulled to ground (~0 V) or vice versa
  • Closed-switch resistance: near 0 ohms; open-switch = infinite/very high resistance

Diagnostic algorithm

  1. Verify P0575 and any other stored codes; record freeze frame and live data. Note whether the input appears stuck high/low or intermittent.
  2. Check related fuses and power/ground for the cruise system; replace blown fuses and retest.
  3. Visually inspect the steering-wheel switch assembly, clock spring, and harness for damage, corrosion, or water intrusion. Repair visible damage.
  4. Using a DVOM or scope, backprobe the cruise input at the switch and at the PCM/BCM. With key ON, observe resting voltage; operate the switch and verify the expected change in voltage/state.
  5. If the input doesn’t change at the switch, remove the switch and bench-test or substitute a known-good switch. If switch tests good, check continuity and resistance from the switch connector to the PCM/BCM pin(s).
  6. If continuity is OK at rest but signal changes intermittently, perform a wiggle/stress test along the harness (steering column flex) while monitoring the input to find intermittent breaks.
  7. If a short to power or ground is suspected, isolate the circuit and measure resistance to power/ground with connectors disconnected to locate short location.
  8. Repair or replace the faulty wiring, connector, clock spring, or cruise switch as found. If wiring and switch check good but input driver at PCM/BCM is faulty, consider module replacement or manufacturer guidance.
  9. Clear codes, perform function test and road test to confirm repair. Re-scan for codes after test drive.

Likely causes

  • Faulty cruise control switch in steering wheel
  • Open/short in harness at steering column (wire chaffing or broken pin)
  • Corroded/loose connector at the PCM/BCM or switch
  • Blown fuse or missing power/ground to the input circuit

Fault status

⚠️ Status
Cruise control unavailable — electrical input fault (P0575). Service required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

P0571 P0572 P0573 P0576 U0121
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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