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P1405

Exhaust Gas Recirculation System Valve 3.

  • Chrysler
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
4
AreaAuxiliary emission controls
05
FaultThe specific fault in that area

What it means

On Chrysler vehicles, P1405 relates to the exhaust gas recirculation (EGR) system, specifically 'valve 3'. The powertrain control module has detected a fault in the circuit or operation of that EGR valve or solenoid. How many EGR valves or solenoids are fitted, and which one is 'number 3', depends on the model and engine, so check the model-specific information.

Symptoms

  • Engine warning light on
  • Rough or unstable idle
  • Hesitation or surging at light throttle
  • Pinking or detonation under load
  • Failed emissions test with raised NOx
  • Slightly poorer fuel economy

Possible causes

  • EGR valve or solenoid number 3 faulty, sticking or clogged with carbonlikely
  • Wiring or connector fault in the EGR valve or solenoid circuit, such as corrosion, chafing, an open circuit or a shortlikely
  • Blocked EGR passages or pipework restricting flowpossible
  • Vacuum supply or hose fault feeding the EGR valve, on vacuum-operated systemspossible
  • Poor power or earth supply to the EGR circuitpossible
  • Fault inside the powertrain control module driver circuitrare

How to diagnose

  1. Read all stored and pending codes and note the freeze frame data, such as load, engine temperature and speed, when the code set.
  2. Look up the EGR system layout for the exact model and engine to find out what 'valve 3' refers to.
  3. Visually inspect the EGR valve or solenoid wiring, connectors and vacuum hoses for damage, corrosion, heat damage or splits.
  4. Check the EGR valve or solenoid supply voltage and earth with a multimeter against the model's wiring diagram.
  5. Measure the solenoid or actuator resistance and compare it with the manufacturer's specification.
  6. Use a scan tool to command the EGR valve and watch for a change in idle quality or in feedback readings.
  7. Remove the EGR valve and inspect it and the passages for carbon build-up or a stuck valve.
  8. Clear the code after repair and road test to confirm it does not return.

How to fix

  • Repair or replace damaged wiring or connectors in the EGR circuit.
  • Replace the faulty EGR valve or solenoid assembly.
  • Clean or clear blocked EGR passages and pipework, replacing any parts that cannot be restored.
  • Replace split, loose or perished vacuum hoses and repair any vacuum supply fault.
  • Repair power or earth supply faults found during testing.
  • Only if all else is proven good, diagnose and repair the control module as directed by the manufacturer's procedures.

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but book it in soon because a faulty EGR system can cause poor running, pinking and higher emissions. Avoid heavy load and stop driving if it runs very roughly or pinks badly.

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

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