Faulty speed control switch assembly, with a worn or stuck contact in the steering wheel or stalk switch; Clockspring (spiral cable) fault in the steering column giving a high or open circuit reading; Switch signal wire shorted to voltage or damaged wiring harness; Corroded, loose or contaminated connector terminals in the switch circuit; Open or poor circuit ground or damaged sensor return in the switch circuit; Faulty powertrain control module.

P1596

Speed Control Switch Always High.

Jeep
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
5: AreaVehicle speed, idle control and auxiliary inputs
96: FaultThe specific fault in that area

What it means

On Jeep vehicles P1596 means the powertrain control module has seen the speed control (cruise control) switch circuit sitting at a high voltage for longer than it should, as if a switch button were stuck or the circuit were shorted to voltage. The module cannot read the switch properly, so cruise control is usually unavailable while the fault is present.

Symptoms

Cruise control will not engage or set
Cruise control cancels itself unexpectedly
Cruise control buttons do nothing or behave erratically
Malfunction indicator lamp on, or cruise lamp flashing on some models
Fault may come and go depending on steering wheel position

Possible causes

Faulty speed control switch assembly, with a worn or stuck contact in the steering wheel or stalk switchlikely
Clockspring (spiral cable) fault in the steering column giving a high or open circuit readinglikely
Switch signal wire shorted to voltage or damaged wiring harnesspossible
Corroded, loose or contaminated connector terminals in the switch circuitpossible
Open or poor circuit ground or damaged sensor return in the switch circuitpossible
Faulty powertrain control modulerare

How to diagnose

Read the stored and pending codes and freeze frame data, noting whether other cruise, brake switch or steering wheel switch codes are present
Check whether cruise control works at all and whether the switch buttons feel stuck, sticky or worn
Inspect the switch, clockspring and PCM connectors and wiring for damage, corrosion, moisture or pushed-back terminals
Using a scan tool live data, watch the speed control switch voltage or status while pressing each button and turning the steering wheel, looking for a stuck high reading
Check the switch circuit for a short to voltage and for open circuit or poor ground using a multimeter and the wiring diagram for the specific model
Test the switch resistance in each button position against the manufacturer specification, which varies by model and year
Test the clockspring continuity and resistance, taking care with airbag safety precautions and following the correct procedure for the vehicle
Only after wiring and switch are proven good, consider the PCM and check for any applicable software updates

How to fix

Replace the faulty speed control switch assembly
Replace the clockspring following the manufacturer procedure, observing airbag safety precautions
Repair or replace damaged wiring that is shorted to voltage or open circuit
Clean or repair corroded connectors and secure loose terminals
Restore the circuit ground or sensor return connection if faulty
Replace or reprogram the PCM only if confirmed faulty or if an outdated calibration is a known cause for that model

Can I keep driving?

Low severity

The car can normally be driven as usual, as the main effect is loss of cruise control. Book it in soon, particularly if the steering wheel controls or airbag warning lamp are also affected.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.