P0585 Fault Code

Cruise Control Multi-Function Input A / B Correlation

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0585 fault code indicates an issue with the Cruise Control Multi-Function Input A / B correlation. This code is triggered when the Engine Control Module (ECM) detects a mismatch between the signals sent from the cruise control switches.

• Cruise Control System: This system allows the vehicle to maintain a certain speed without needing to keep the accelerator pedal pressed.
• Multi-Function Inputs: Typically includes signals from switches that control cruise control settings, such as 'set', 'resume', and 'cancel'.
• Correlation Check: The ECM constantly verifies that the input from both input A and input B match to ensure proper functionality of cruise control features.

What are the symptoms of the P0585 code?

Drivers experiencing a P0585 fault code may notice:

• Cruise control system becoming non-functional or erratic.
• Difficulty in setting or maintaining a desired speed.
• A warning light on the dashboard, indicating a malfunction in the cruise control system.
• In some cases, drivers may feel the vehicle accelerating or decelerating unexpectedly.

What causes the P0585 code?

Several factors can lead to the P0585 code being triggered, including:

• Faulty cruise control switches that may be sending inaccurate signals.
• Damaged wiring or poor connections in the cruise control circuit.
• Issues with the ECM such as software glitches or internal faults.
• Problems with the throttle position sensor that could affect cruise control performance.

How to fix P0585?

To resolve the P0585 code, the following steps may be taken:

• Inspect the cruise control switches for proper operation and any signs of damage.
• Check wiring and connectors for corrosion, frays, or breaks, and repair as necessary.
• Test the ECM for any software updates or internal faults that may need addressing.
• Evaluate the throttle position sensor and replace it if it is found to be faulty.

After repairs, clear the fault code and test drive the vehicle to ensure functionality.