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DTC codes / Chrysler codes / P1562

P1562 · ChryslerCruise Vacuum Solenoid

P1562 on Chrysler vehicles indicates that the powertrain control module (PCM) has detected an electrical fault in the cruise vacuum solenoid circuit, which controls vacuum to the cruise control servo. The PCM monitors the solenoid's command circuit and expects a specific current or voltage response; when the signal falls outside the expected range, it stores this code and disables cruise control.

SystemPowertrain
Code typeChrysler specific
SeverityLow
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • Cruise control will not engage or drops out intermittently while driving
  • The cruise indicator light may flash or fail to illuminate when the button is pressed
  • Often no symptoms besides the warning light, with cruise control simply becoming inoperative
  • Engine may exhibit a slightly rough idle if the solenoid is stuck open and creates a vacuum leak
  • Possible hissing sound from the engine bay near the cruise servo or vacuum lines
  • On some models, the transmission may shift differently if the vacuum leak affects engine load calculations

Common causes, most likely first

  1. Failed cruise vacuum solenoid, often due to an open or shorted internal coil
  2. Damaged, disconnected, or corroded electrical connector at the solenoid
  3. Broken or cracked vacuum hose between the intake manifold, solenoid, and cruise servo
  4. Faulty cruise control servo that draws excessive current or shorts the solenoid circuit
  5. Wiring harness damage such as chafed wires or a broken ground near the solenoid
  6. Corroded or loose pins at the PCM connector for the solenoid control circuit
  7. A stuck or leaking vacuum check valve in the cruise control system causing the solenoid to overwork

How to diagnose and fix it

  1. Inspect the vacuum hoses and electrical connector at the cruise vacuum solenoid for obvious damage or disconnection
  2. Use a scan tool to command the solenoid on and off while listening for a click and checking for vacuum at the servo
  3. Measure the solenoid's coil resistance with a multimeter and compare to the manufacturer's specification
  4. Check for battery voltage and ground at the solenoid connector with the key on and the cruise system active
  5. Perform a wiggle test on the wiring harness and connectors while monitoring solenoid operation to reveal intermittent faults
  6. If electrical checks pass, apply vacuum to the servo directly to confirm the servo and vacuum lines hold vacuum
  7. Replace the cruise vacuum solenoid if it fails electrical or functional testing, then clear the code and verify cruise operation

Cruise Vacuum Solenoid Faults You Might Overlook

  • A vacuum leak anywhere in the cruise control system can cause the solenoid to be commanded continuously, eventually setting P1562 due to excessive current draw or a feedback mismatch.
  • The PCM may set P1562 even when the solenoid coil is good, if the cruise servo's internal position sensor is faulty and sends implausible feedback that the PCM interprets as a solenoid circuit problem.
  • On many Chrysler models, the cruise vacuum solenoid shares a ground circuit with other engine bay components, so a corroded ground point can trigger this code along with unrelated symptoms.
  • A sticking cruise servo diaphragm can cause the solenoid to remain energized longer than expected, leading to an overcurrent condition that sets P1562 without any visible damage to the solenoid itself.
  • After replacing the solenoid, some Chrysler vehicles require a relearn or calibration procedure for the cruise control system to restore normal operation and prevent the code from returning.

Can I keep driving with P1562?

The vehicle remains safe to drive because the only immediate effect is that cruise control is disabled, but avoid using cruise control until the fault is repaired. If you notice a rough idle or hissing noise, have the vacuum leak checked promptly to prevent drivability issues.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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