P0591
Speed Control Multiplexed Switch Performance
Generic code
Vehicle Speed and Idle Control System
Low severity
Moderate repair
Free on OBD DashX
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What P0591 means
- The fault code P0591 refers to a malfunction in the cruise control multi-function input circuit B. This may affect the proper functioning of the cruise control system.
Possible symptoms
- Illuminated check engine light
- Inability to set or maintain cruise control speed
- Unresponsive cruise control switches
- Malfunctioning cruise control system.
Possible causes
- Failed cruise control multi
- function switch B
- Corroded or damaged electrical connections
- Failed cruise control module
- Failed powertrain control module (PCM)
Related parts
- Vehicle Speed Sensor:
Possible solutions
- Replace/repair the cruise control switch if necessary
- Check and repair any damaged or corroded connections in the circuit
- Replace the cruise control module if necessary
- Replace the powertrain control module (PCM) if necessary
- Clear the fault code and test the system after each step to determine if the fault is resolved
Free on OBD DashX
P0591 on OBD DashX
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