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P1554

Cruise Engaged Circuit High Voltage.

  • Chrysler
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
5
AreaVehicle speed, idle control and auxiliary inputs
54
FaultThe specific fault in that area

What it means

P1554 on a Chrysler means the powertrain control module has seen a high voltage on the cruise engaged circuit. This is the circuit that tells the module when cruise control is active or being requested. The module flags the fault when the signal voltage sits higher than expected for the switch or brake input state, which points to a wiring, switch or module-side problem. Exact circuit layout and test values vary by model and year, so check the factory wiring information for your vehicle.

Symptoms

  • Cruise control will not engage or drops out unexpectedly
  • Cruise control indicator light behaves oddly or stays on
  • Check engine light on
  • Cruise set and resume buttons unresponsive
  • Brake lights or stop lamp behaviour may be abnormal on some models

Possible causes

  • Faulty cruise control switch or steering wheel switch assembly sending a high or stuck signallikely
  • Short to voltage or damaged wiring in the cruise engaged signal circuitlikely
  • Corroded, loose or pushed-out terminals in a connector on the circuitpossible
  • Faulty brake light switch or stop lamp switch feeding the cruise circuit (model dependent)possible
  • Worn or damaged clockspring affecting the switch signal on steering-wheel-mounted controlspossible
  • Fault inside the powertrain control modulerare

How to diagnose

  1. Read all stored and pending codes and record the freeze frame data before clearing anything
  2. Check for other codes related to brake switch, vehicle speed or cruise, as they can point to a shared cause
  3. Visually inspect the cruise switch, brake switch and related wiring and connectors for damage, moisture, corrosion or chafing
  4. Using a scan tool, watch the cruise switch and brake switch status while operating each control and look for stuck or implausible readings
  5. Check the brake light switch operation and that the brake lights work correctly
  6. With the ignition on, measure the circuit voltage at the module and switch against the factory wiring diagram and specification for that model
  7. Check the circuit for a short to voltage by disconnecting the switch and re-measuring, then test wiring continuity and resistance
  8. Inspect the clockspring and its connector if the switch is in the steering wheel, following the manufacturer's safety procedure for airbags

How to fix

  • Replace the faulty cruise control switch or switch assembly
  • Repair or replace damaged wiring and fix any short to voltage in the cruise engaged circuit
  • Clean, repair or replace corroded or damaged connectors and terminals
  • Replace or adjust the brake light switch if it is faulty or out of position
  • Replace the clockspring if testing shows it is faulty
  • Replace or reprogram the powertrain control module only after all wiring and switch faults are ruled out and the manufacturer confirms it

Can I keep driving?

Low severity

The car is normally safe to drive, though cruise control may not work. Book it in for diagnosis soon, and have the brake lights checked straight away if they are not working properly.

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

This code for other makes

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