P1564 - FAULT CODE - OBD2

P1564 BUICK, CADILLAC, CHEVROLET, GMC: CRUISE CONTROL SYSTEM VEHICLE ACCELERATION TOO HIGH

The cruise control is a feedback control system installed in many modern vehicles. The purpose of this system is to maintain a constant car speed despite external conditions, such as wind changes or similar. To achieve this, the vehicle’s speed is measured and compared to the desired or reference speed and the throttle is automatically adjusted.

The duct updates the vehicle manually through the use of a button, with which the cruise control is adjusted to the current speed. The system takes its speed signal from a rotating driveshaft, a speedometer cable, and a Wheel Speed Sensor. Most cruise control systems do not allow the use of the system below a speed of about 40 km/h. The vehicle maintains the desired speed with the use of a vacuum-powered servo mechanism or by electronics integrated into the car, in the case of using the DBW (Cable Driving System).

When the diagnostic code P1564 OBDII is set, it is because with the engine running and the cruise control enabled and activated, the PCM (Powertrain Control Module) detects a vehicle acceleration rate, which is considered extremely fast.

• The Check Engine lamp lights up.
• Irregular operation of the cruise control.

The DTC code P1564 OBD2 is stored for one or more of the following reasons:

• The cruise control system circuit may have damage to the wires or connectors in your circuit.
• The electrical connections of the cruise control may have deficiencies that cause the malfunction.
• The Cruise Control System may be in poor condition.

To solve the fault code P1564 OBDI, consider the following steps:

• Check out the TSB.
• Scan the vehicle and check if additional codes are stored in the P1564. In this case, the diagnosis of the codes must be according to the order shown in the tools.
• Check the condition of all electrical components related to the Cruise Control System. If you discover burns on the wires or corrosion on the connectors, make the respective corrections.
• Measure the cruise control circuit voltages and verify that they match those specified by the manufacturer. If you detect an out-of-range voltage, make the appropriate adjustments.