Faulty speed control switch or stuck button, often worn or contaminated; Clock spring (spiral cable) fault in the steering wheel, where the switches are wheel-mounted; Signal wire short to voltage or open circuit in the switch signal or ground wire; Corroded, damaged or loose connector at the switch, steering column or control unit; Poor ground connection for the switch circuit; Faulty powertrain control unit input circuit.

P1596

Speed Control Switch Always High.

Dodge
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 Dodge vehicles P1596 means the speed control (cruise control) switch signal has been seen at a high voltage constantly. The engine or powertrain control unit expects the voltage to change as the driver presses the cruise buttons, but it reads a permanently high signal, which points to a stuck switch, a short to voltage or an open circuit fault. Exact wiring and switch layout vary by model and year.

Symptoms

Cruise control will not set, resume or accelerate
Cruise control switches have no effect
Cruise control cancels itself unexpectedly
Engine warning light on
Cruise indicator light not working or flashing

Possible causes

Faulty speed control switch or stuck button, often worn or contaminatedlikely
Clock spring (spiral cable) fault in the steering wheel, where the switches are wheel-mountedlikely
Signal wire short to voltage or open circuit in the switch signal or ground wirepossible
Corroded, damaged or loose connector at the switch, steering column or control unitpossible
Poor ground connection for the switch circuitpossible
Faulty powertrain control unit input circuitrare

How to diagnose

Read the stored and pending codes and note the freeze frame data, then check for other cruise, brake switch or body control codes
Check the cruise control buttons for a sticking action, spillage or visible damage, and see if the cruise indicator behaves normally
Using live data, watch the speed control switch reading while pressing each button and see if it stays high or fails to change
Inspect the wiring and connectors at the steering wheel, clock spring, column and control unit for damage, corrosion or pushed-out pins
Check the switch circuit's reference voltage, signal and ground against the wiring diagram for the specific model
Test the switch resistance in each button position against the manufacturer's specification for that model
Wiggle-test the wiring and clock spring while watching live data to find intermittent faults
Check the control unit's power and grounds before suspecting the unit itself

How to fix

Replace the faulty speed control switch or switch assembly
Replace the clock spring if it is open circuit or intermittent, following the correct airbag safety and centring procedure
Repair any wiring short, open circuit or poor ground in the switch circuit
Clean, repair or replace damaged connectors and terminals
Replace or reprogram the control unit only after all wiring and switch faults are ruled out and confirmed by the manufacturer's procedure

Can I keep driving?

Low severity

The car is normally safe to drive because only the cruise control is affected. Book it in for repair at your convenience, and take extra care if the fault is in the steering wheel, as airbag components may be involved.

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