Faulty clutch pedal position switch (clutch switch) or its connector; Open or high-resistance wiring in the clutch control circuit; Short to voltage on the signal wire between the switch and the PCM; Corroded or damaged PCM connector pins; Internal PCM fault (rare but possible); Aftermarket accessories or wiring tapped into the clutch circuit

DTC codes / Chrysler codes / P1588

P1588 · ChryslerCruise Control Clutch Control Circuit High

Q: What does code P1588 mean?

Cruise Control Clutch Control Circuit High. P1588 on Chrysler vehicles indicates the powertrain control module (PCM) has detected a high voltage condition on the cruise control clutch control circuit, which is the electrical path that tells the PCM whether the clutch pedal is depressed. The PCM expects a specific voltage range on this circuit and sets the code when the signal exceeds that range, typically because the circuit is open, shorted to voltage, or the switch is faulty.

P1588 on Chrysler vehicles indicates the powertrain control module (PCM) has detected a high voltage condition on the cruise control clutch control circuit, which is the electrical path that tells the PCM whether the clutch pedal is depressed. The PCM expects a specific voltage range on this circuit and sets the code when the signal exceeds that range, typically because the circuit is open, shorted to voltage, or the switch is faulty.

SystemPowertrain

Code typeChrysler specific

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

Cruise control may not engage or may disengage unexpectedly when the clutch pedal is pressed
The cruise control indicator light may flash or fail to illuminate
Often no symptoms besides the warning light, especially if the fault is intermittent
On manual-transmission vehicles, the engine may not disengage cruise control when the clutch is depressed
Possible stored code in the PCM with no drivability complaints

Common causes, most likely first

Faulty clutch pedal position switch (clutch switch) or its connector
Open or high-resistance wiring in the clutch control circuit
Short to voltage on the signal wire between the switch and the PCM
Corroded or damaged PCM connector pins
Internal PCM fault (rare but possible)
Aftermarket accessories or wiring tapped into the clutch circuit

How to diagnose and fix it

Verify the code with a scan tool and check for any related codes in the PCM and other modules
Inspect the clutch pedal switch and connector for damage, corrosion, or loose pins
Measure resistance and voltage on the clutch control circuit according to the factory wiring diagram
Check for continuity and shorts to voltage on the signal wire from the switch to the PCM
Test the clutch switch operation with a multimeter while pressing and releasing the pedal
If the switch and wiring are good, check the PCM connector and perform a wiggle test on the harness
Replace the faulty clutch switch or repair the wiring as needed, then clear codes and verify the repair

Clutch switch checks before PCM replacement

A common oversight is assuming the clutch switch is bad when the real problem is a chafed wire near the pedal assembly or a corroded connector that only acts up in damp weather.
The code can set intermittently and may not turn on the check engine light on some Chrysler models, so a stored code without a light is still worth diagnosing.
Aftermarket floor mats or pedal covers that interfere with the clutch pedal travel can cause the switch to read incorrectly and set this code.
Do not replace the PCM until you have verified the entire circuit, because a shorted signal wire can mimic a failed PCM and the new unit will set the same code.
On some vehicles, the clutch switch shares a ground with other pedals or sensors, so a bad ground can affect multiple circuits and set related codes.

Can I keep driving with P1588?

The vehicle is safe to drive because this fault primarily affects cruise control operation and does not impair engine or transmission function. Avoid using cruise control until the repair is completed, and be aware that on a manual transmission the engine may not disengage cruise control when you press the clutch, which could be dangerous in an emergency.

Tools that help

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Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.