What Does P0588 Mean?
The ECM has detected that the cruise control vent solenoid circuit is reading high, meaning the voltage on the control circuit is above the expected level. This high condition typically indicates an open in the vent solenoid winding, a disconnected connector, or the ECM driver cannot pull the circuit low to energize the solenoid. The vent function may be stuck open or closed depending on the solenoid design.
Common Causes
35%
Open circuit in the vent solenoid coil winding preventing current flow and causing the control pin to float high
30%
Disconnected vent solenoid connector causing the ECM control wire to float to supply voltage
20%
Open wire in the vent solenoid circuit between ECM and solenoid
15%
ECM solenoid driver failed open, unable to ground the vent solenoid circuit
Diagnostic Steps
1
Step 1: Verify the vent solenoid connector is fully connected with the locking tab engaged. A disconnected connector is the simplest cause of a high circuit reading.
2
Step 2: Disconnect the solenoid and measure coil resistance (typically 30-60 ohms). An open reading confirms a failed solenoid.
3
Step 3: With the solenoid connected, backprobe the ECM control pin. Command cruise control active and verify the ECM pulls the pin low. If the voltage remains high, either the solenoid is open or the driver is faulty.
4
Step 4: Check continuity of both wires from the solenoid connector back to the ECM. An open on the power supply or control wire will prevent the circuit from functioning.
5
Step 5: Replace the vent solenoid if the coil is open. If wiring is the issue, repair the open circuit. After repair, verify the vent solenoid clicks when commanded and cruise engages/disengages properly.
Estimated Repair Cost
$30 - $250
Parts + labor, varies by vehicle and location
The ECM has detected that the cruise control vent solenoid circuit is reading high, meaning the voltage on the control circuit is above the expected level. This high condition typically indicates an open in the vent solenoid winding, a disconnected connector, or the ECM driver cannot pull the circui...
The most common cause of P0588 (Cruise Control Vent Control Circuit High) is: Open circuit in the vent solenoid coil winding preventing current flow and causing the control pin to float high
Typical repair costs for P0588 range from $30 to $250, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vent solenoid cannot be controlled by the ECM. Depending on the solenoid's de-energized state (normally open or normally closed), cruise may either fail to engage or fail to release. The ECM disables cruise control, and the brake pedal provides mechanical override.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0588 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cruise Control System (Vacuum-Actuated)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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