P0576 — Cruise Control Input Circuit Low

Can I safely drive with P0576?

P0576 normally leaves ordinary acceleration and braking unchanged, but cruise control may be unavailable or cancel unexpectedly. Avoid using cruise control until the input circuit has been diagnosed and repaired.

Does P0576 mean the brake system has failed?

No. P0576 identifies a low signal in the cruise-control input circuit, not low brake pressure or a failed brake booster. Any loss of braking ability still requires immediate diagnosis.

Will clearing the P0576 code fix the problem?

No. Clearing P0576 only erases the stored record; it does not correct a defective cruise switch, shorted wire, bad connector, or failed PCM input circuit.

What should be checked first for P0576?

Start with the cruise-control switch, its connector, and the input voltage or resistance at the PCM. These checks can distinguish a switch fault from wiring or reference-circuit problems.

P0576 is an OBD2 diagnostic trouble code that falls under the powertrain category, meaning it relates to the engine or transmission control systems. When the PCM or body control module detects that a cruise control input circuit is holding voltage too far below its expected operating range — essentially sitting near ground potential — it logs P0576. The official description reads "Cruise Control Input Circuit Low." In plain terms, the circuit is not receiving the voltage it should, which points to one of two root causes: either the wiring is shorted to ground, draining the signal low, or the component responsible for driving that circuit is failing and pulling the voltage down on its own.

The module does not set P0576 off a single bad reading. To prevent false flags, the ECU requires the fault to repeat under specific conditions — typically multiple ignition cycles with the cruise control circuit active — before illuminating the Check Engine light. When P0576 is stored, the associated freeze frame data is gold. It records engine load, RPM, vehicle speed, coolant temperature, and other sensor values at the exact moment the fault occurred. That snapshot tells you whether the problem happens at highway speed, during acceleration, when the brakes are pressed, or under any other specific circumstance, and that is where your diagnosis should begin.

Common Symptoms of P0576

• The Check Engine light is illuminated and stays on.
• The cruise control system stops responding or operates inconsistently.
• The vehicle may enter a limited-performance mode, depending on which module controls the cruise circuit.
• Fuel consumption can increase if the cruise control engages and disengages erratically.
• The brake or clutch input signal may be affected, since many cruise control systems share circuits with the brake switch.
• In rare cases, the vehicle feels sluggish or reluctant to accelerate under power, though this is more common if a related code is also present.

What Causes P0576?

• The cruise control input sensor or actuator itself has failed, dragging the circuit voltage low.
• A chafed or pinched signal wire has shorted to ground somewhere in the harness.
• The cruise control circuit is missing its supply voltage, leaving the input floating at ground.
• An open or shorted wire exists somewhere along the cruise control input circuit.
• A connector is corroded, pushed apart, or has damaged pins that prevent a solid electrical connection.
• A weak or intermittent ground connection is pulling the signal down.
• A blown fuse is cutting power to the cruise control circuit entirely.

How to Diagnose P0576

1. Connect a quality OBD2 scanner, read all stored codes, and record the freeze frame data alongside P0576. Note the specific driving conditions recorded — speed, load, and whether the brake was applied — and replicate them during your test drive.
2. Look for any related diagnostic trouble codes. P0562, P0563, P0571, and other power or brake-related codes often appear alongside P0576 and can point you toward the root cause faster than inspecting the cruise circuit alone. Check manufacturer TSBs for your specific make and model using the VIN on the manufacturer's website or NHTSA — many P0xxx codes have published technical service bulletins with known fixes or software updates.
3. Perform a thorough visual inspection of the wiring harness and connectors in the cruise control circuit. Look for cracked insulation, bare copper strands, corrosion buildup, or pins that are pushed out of their sockets. Pay close attention to areas where the harness bends or passes near heat sources.
4. With the ignition on and the cruise control circuit powered, check for supply voltage at the cruise control input connector. Then, with the connector disconnected, measure resistance from the signal wire to ground — a reading near zero ohms confirms a short to ground in the harness.
5. At the component side of the connector, verify reference voltage, good ground, and signal continuity end-to-end. Any broken connection or unexpected resistance will show up here.
6. Perform a wiggle test on the harness while monitoring the live data stream. Any signal dropout or intermittent voltage collapse while moving the wires confirms a broken or pinched conductor.
7. Clear all codes, complete a full drive cycle that reproduces the freeze frame conditions, and verify that P0576 does not return before declaring the repair complete.

Repair Options and Cost to Fix P0576

The right repair depends entirely on what your diagnosis uncovers. Never replace an expensive control module before ruling out wiring issues and simple connector problems — those account for the majority of P0576 cases.

• Wiring repair or connector replacement: $80–$250. This is the most common and least expensive fix. If you find a chafed wire, corroded connector, or blown fuse, repair or replace those components and clear the code.
• Faulty sensor or actuator replacement: $150–$500. If the cruise control switch, brake switch, or speed sensor driving the circuit is the culprit, replacing the failed component resolves the code.
• Control module repair or replacement: $300–$1,000. In rare cases the PCM or body control module itself is at fault, either through internal circuit failure or a software calibration issue requiring an update.

Overall, fixing P0576 typically runs between $80 and $1,000 depending on the root cause. The wide range reflects how simple some fixes are — a bad connector pin or blown fuse on the low end — versus a failed module on the high end. An accurate diagnosis before purchasing parts is the single most effective way to keep costs down.

Can You Drive with P0576?

P0576 carries a short-term driving-safety severity rating. In most vehicles the car remains fully drivable with the cruise control simply unavailable, which is an inconvenience rather than a safety concern. However, if the underlying fault begins affecting brake switch inputs or other shared circuits, you could experience stalling, disabled start-stop functionality, or unresponsive adaptive cruise features. If the vehicle exhibits stalling, hard starting, or brake/steering warnings alongside P0576, treat it as urgent and have it diagnosed before your next long trip. For the majority of cases involving only the cruise control circuit, scheduling repair within a week or two is reasonable without compromising safety.

Related OBD2 Codes

• P0500: Vehicle Speed Sensor "A" Malfunction
• P0501: Vehicle Speed Sensor "A" Range/Performance
• P0502: Vehicle Speed Sensor "A" Low Input
• P0503: Vehicle Speed Sensor "A" Intermittent/Erratic/High
• P0504: Brake Switch "A"/"B" Correlation
• P0505: Idle Control System Malfunction