C0064 — Roll Rate Sensor (Subfault)

What does OBD2 code C0064 mean?

OBD2 code C0064 flags a problem with the sensor and actuator circuits (C0064 — roll rate sensor (subfault): causes, symptoms & fix). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, open or shorted wiring in the circuit.

Will C0064 clear itself?

Sometimes C0064 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How do I diagnose C0064 myself?

Start with a scan: confirm C0064, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

What is the most common cause of C0064?

The most common causes are: blown fuse feeding the circuit, corroded, loose or damaged connector, open or shorted wiring in the circuit.

What are the symptoms of C0064?

Drivers most often notice: increased fuel consumption in some cases, the affected system operates intermittently or not at all, Check Engine Light on, possible limp mode depending on the affected component.

The roll rate sensor is a micro-electromechanical device mounted somewhere in the vehicle's body—commonly the trunk floor, spare tire well, or center console area. Its job is to measure how quickly the car is rolling around its longitudinal axis. The stability control module uses this data, combined with inputs from the yaw rate sensor and wheel speed sensors, to determine whether the vehicle is sliding or about to flip. When C0064 sets, it means the control module has lost confidence in the roll rate signal or detected a fault inside the sensor circuit itself.

C0064 is classified as a subfault, which typically indicates a problem within a larger safety system rather than a standalone failure. In this case the affected system is the vehicle stability system, a network of sensors and actuators that work together to prevent rollovers and maintain traction during hard cornering or emergency maneuvers. When the roll rate signal goes missing or reads out of range, the stability system can no longer calculate safe intervention thresholds, and the module stores C0064 to flag the fault.

The engine or powertrain control module monitors this sensor continuously. After the roll rate signal stays outside its acceptable window for a preset number of drive cycles, the module stores C0064 and turns on the check engine light. Freeze frame data captured at the same time records engine RPM, load, coolant temperature, and vehicle speed the instant the fault triggered. That snapshot is extremely useful during diagnosis because it tells you exactly what conditions caused the module to flag C0064.

Symptoms of C0064

• The check engine light or stability control warning lamp is illuminated on the dashboard
• The stability control system may be disabled or operating in a limited-capacity mode
• The anti-lock brakes could react unpredictably or feel different during hard braking
• Fuel economy may increase slightly due to compensatory limp-mode tuning
• The vehicle may enter a reduced-power limp mode, particularly on higher-end models with integrated safety networks
• In some cases the driver notices no symptoms at all until the code is pulled during routine service
• A persistent or recurring C0064 after clearing suggests the underlying fault has not been resolved

Common Causes of C0064

• Broken, chafed, or corroded wiring in the roll rate sensor circuit
• An open or short somewhere in the sensor's power, ground, or signal line
• A blown fuse feeding voltage to the roll rate sensor or its control module
• Water intrusion or corrosion at the sensor electrical connector, leading to poor pin contact
• The roll rate sensor itself has failed internally
• Insufficient or interrupted ground at the sensor mounting point
• A secondary sensor fault—sometimes a failing wheel speed sensor or yaw rate sensor triggers a cascade that also flags C0064

How to Diagnose C0064

1. Connect a compatible OBD2 scanner and confirm C0064 is stored in the control module. Save all freeze frame data associated with the code before clearing anything—this is your roadmap to the conditions under which the fault appeared.
2. Check for any additional trouble codes. Related sensor codes in the same family can point toward a shared power supply or ground problem that is affecting multiple circuits simultaneously.
3. Locate the roll rate sensor using your make's service information and inspect the connector and mounting area. Look for moisture damage, bent pins, broken clips, or obvious wire damage. Many sensors in this application sit in low spots where water and road salt can cause trouble over time.
4. With the key on and engine off, verify reference voltage, ground continuity, and signal wire integrity at the sensor connector using a digital multimeter. Compare your readings against the specifications in the service manual for your vehicle.
5. Perform a wiggle test on the harness while monitoring live data on the scanner. Any dropouts or signal interruptions point to intermittent wiring issues—often a broken strand inside the insulation that only fails under vibration.
6. After addressing any wiring or connector issues, clear the codes and complete a drive cycle that recreates the freeze frame conditions—hard corners, varying speeds, and brake applications if applicable. Re-scan to confirm C0064 does not return.

Repair Options for C0064

Wiring or connector repair — $80–$250: If inspection reveals damaged wires, corroded pins, or a poor connector seal, repair or replace the affected harness section. This is usually the least expensive path and the most common root cause.

Sensor replacement — $150–$500: If the sensor itself is confirmed faulty through voltage and signal checks, replacement is the standard fix. The part cost varies by make and model; labor is typically straightforward since the sensor is usually accessible.

Control module repair or replacement — $300–$1,000: In rare cases where the issue traces back to the stability control module rather than the sensor, repair or replacement is required. This is the most expensive scenario and should be confirmed through thorough wiring diagnosis before proceeding.

Total out-of-pocket for C0064 typically falls between $80 and $1,000 depending on what is actually faulty. An accurate diagnosis before purchasing parts almost always prevents overspending on a control module when the real problem was simply a corroded connector.

Driving Safety Verdict for C0064

In most vehicles C0064 does not render the car undriveable, though the stability control system may be partially or fully disabled depending on how the manufacturer programs the fault response. Some models reduce engine power or alter brake bias when this code is active. If you experience stalling, no-start conditions, or warning lights specifically for brakes or steering, treat the issue as urgent and have it diagnosed immediately. Otherwise, schedule service at your earliest convenience—do not ignore a recurring check engine light related to safety-critical sensors.