Question about 2005 Dodge Caravan
The P0406 code is set normally when there is a open circuit inside the erg valve sensor. this code is not normally related to a valve sticking open- this could cause a low speed or coast down stall.
I would take a screw driver and push the red locking clip sideways to release the lock and take the connector off and look for loose or pushed out wire terminals. reconnect the wiring and tap on the side of the egr valve several times .
You can disconnect the battery to clear the fault and test drive the van. If the problem does not come back after driving for 10 miles or so its intermittent . And not active at this time .
This code may not come back on until your trip is done. This fault will not cause the van to die in flight.
You can drive it like this if needed. The worst that can happen is excessive spark knock-pinging on acceleration . If it does, back off some on the gas pedal.
Posted on Apr 20, 2010
P406 is a EGR code, EGR will also cause a knocking/ pinging sound when there bad. Very common problem. The position sensor inside the valve goes bad. Your going to have to replace the whole EGR valve and it can put out variety of codes from P0401 to P0406. The new valve will solve the problem and easy to replace, you can pick one up at Auto Zone and they can give you the step by step instructions to replacing the EGR with common tools. Good luck and hope this helps.
Posted on Jul 06, 2009
3.3 engines has the egr valve with transducer.you have to replace the whole unit. code p0406 what its trying to tell you your egr valve circuit is short to ground.it has failed .
Posted on Jul 04, 2009
SOURCE: what does the check engine
P0406 - Exhaust Gas Recirculation Sensor A Circuit High
An improper voltage signal is sent to ECM through the valve
Early Models : The EGR valve control the amount of exhaust gas routed to the intake manifold. Vacuum is applied to the EGR valve in response to the throttle opening. The vacuum control the movement of the taper valve connected to the vacuum diaphragm in the EGR valve.
Late Models : The EGR volume control valve uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECM. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECM does not issue the pulse signal. A certain voltage signal is issued so that the valve remains at that particular opening.
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hesitation
- Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control solenoid valve
- EGR temperature sensor and circuit
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve
Hope helps (remember to rate and comment this answer).
Posted on Mar 31, 2011
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