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EGR Valve


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I sticking EGR will produce codes, like the PINDLE POSITION code. Here are a few of the EGR codes

P0400 - Exhaust Gas Recirculation Flow Malfunction

P0401 - Exhaust Gas Recirculation (EGR) Flow Insufficient

P0402 - Exhaust Gas Recirculation Flow Excessive Detected

P0403 - Exhaust Gas Recirculation (EGR) Solenoid Control Circuit

P0404 - Exhaust Gas Recirculation (EGR) Open Position Performance

P0405 - Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage

P0406 - Exhaust Gas Recirculation Sensor A Circuit High

P0407 - Exhaust Gas Recirculation Sensor B Circuit Low

P0408 - Exhaust Gas Recirculation Sensor B Circuit High

P1406 - EGR Valve Pintle Position Circuit

P1407 - EGR Air Intrusion in Exhaust Supply to EGR Valve

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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EGR's fail three ways

1) Stuck Open = Rough idle, difficult cold start, engine stalls

2) Leaking while closed = Not as bad as stuck open but in the same ball park

3) Stuck Closed = This is harder to diagnose... but usually you will get high NOS readings during an emissions check.. Some engines will knock and ping under load...

Good Luck

I agree with BByF... Most times N*s will issue a code.


Easin' down the highway in a new Cadillac,

I had a fine fox in front, I had three more in the back

ZZTOP, I'm Bad I'm Nationwide


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