06, 195 1/2 K Miles. Saturday night I set a P0405 Cel. I removed the EGR Valve Sunday and cleaned it, it didn't look that bad and I didn't think that was the answer and I was right. I drove to work this morning and watched the gauge and this is what was going on. On cold start the EGR Gauge showed "0". It stayed that way until ECT reached 160* then it registered low 30's, it would spike for a second to 85 and go right back down to 30's then drop to 9 for a sec. and back up to 30's. Most of the drive it would show low 30's high 40's but did not set the Cel. On the way home it did the same thing, "0" until 160* ect. ect. The only Difference was it set both the P0404 and P0405. I know there's more to this system than the Valve and was wondering if there are other sensors that should be checked or cleaned before buying a new EGR Valve ? A quick look at pig tail wires showed no chaffing
Thank You Tim

 

Have you Cleaned the IAT#2 in the Intake manifold

Might just need a New EGR

What PID are you watching Volts or Duty Cycle??

 

P0404 EGR Exhaust Gas Recirculation Control Circuit Range/Performance EGR sensor or valve, EGR position circuit
P0405 EGR Exhaust Gas Recirculation Sensor A Circuit Low Open circuit, short to ground, EGR position sensor




You probably have these already, but I thought I'd throw them out here.

EGR Duty Cycle (Percent)

TXD: 07E022166E

RXF: 04620516066E

RXD: 3010

MTH: 006440000000 006440000000

NAM: EGR

KO=0 LI=0-15 HI=32 OR=0-44 %


EGR Throttle Position Control Signal

TXD: 07E022096C

RXF: 04620509066C

RXD: 3010

MTH: 00647FFF0000

NAM: ETP


EGR Valve Position (mm)

TXD: 07E022096A

RXF: 04620509066A

RXD: 3010

MTH: 000100010000

NAM: EVP

Note: EGR Valve Position in hundredths of a millimeter, where 0 mm indicates a closed EGR valve position.


EGR Valve Position Desired (%)

TXD: 07E02209D2

RXF: 0462050906D2

RXD: 3010

MTH: 00647FFF0000

NAM: EVD

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

EGR Valve Position Measured (%)

TXD: 07E02209FE

RXF: 0462050906FE

RXD: 3010

MTH: 00647FFF0000

NAM: EVM
Note: MEASURED EGR Valve Position, in %, where a low value indicates a closed EGR valve (0 EGR flow), and a high value indicates an open EGR valve.

KO=0 LI=0 HI=9.72 OR=0 - 14 PERCENT



EGR Valve Position (Volts 0-5)

TXD: 07E022167E

RXF: 04620516067E

RXD: 3010

MTH: 000133330000

NAM: EGV

KO=0.8 LI=0.8 -1.0 HI=1.3 OR=0.6 - 3.5 VOLT

I assume you are monitoring EGR Duty cycle. You can try monitoring all the EGR PIDs.

If the sensor is integrated into the valve you may be looking at replacing the valve.

Again, you probably have all this info, but in case you don't.....


.

 

Thanks guys, I'm monitoring the Duty Cycle, and no I haven't cleaned the IAT #2 yet guess I should try that.

 

9 times out of 10 a code P0405 is caused by the egr valve itself.

 

Thanks big inch, this trucks been So Sweet to me

 

I cleared the codes and they stayed off for 20 days, but they both came back yesterday. So I pulled and cleaned the MAP and the IAT2 sensors today. The MAP didn't look to bad but the IAT2 sensor was pretty gunked up. After reinstalling and starting no CEL Light came on but I haven't driven it yet. I'll keep an eye on it and post back the results.
Thank You for your help........ Tim

 

It's been one month since I cleaned the MAP and IAT2 sensors. I drive the truck to work
daily, 80 miles round trip. The codes have not returned yet, so far so good.

 

p0405 is a bad valve.

 

Thanks Cheezit, just what I wanted for Xmas, an EGR valve (NOT)

 

Tim for a month is good, all I wanted for Christmas was a Delete kit, so the codes came back?

 

My first rebuilt replacement Egr valve worked for a month then it would code 405 after heavy acceleration. I too cleaned various and sundry things before giving up and just leaving it unplugged for a while.
My second brand new replacement valve works perfectly. No more codes, no smoke, boost to 28 psi and correct fan operation.

 

Thanks for the input Pete. Just like the rebuilt MAF I bought for my Wife's car that didn't work. It convinced me I didn't know what I was doing, so took the car to a shop to find out the MAF wasn't any good!!!! Huuuuuhhhh????? Sounds like it's New or Nothing!!!

 

No, the codes are still clear. But who's dumb enough to bet against Cheezit and Big Inch? They'll clean your clock.

 

I would never second guess to a Tech, Hope you get the 6.0 back up and running Bud Merry Christmas.