P11D7 code ?

35896 Views 63 Replies 20 Participants Last post by Chris Tobin, Jun 28, 2016

Scott M.

Discussion Starter · Nov 4, 2013

I have this code come up every now and then. It hasnt posted a CEL yet but its in there when I sometimes check it with a scanner tool. I googled it to death and can only find one thread that says its a camshaft actuator on an Audi. Anybody have any insight.

Thanks,
Scott

41 - 60 of 64 Posts

diesel

· #41 · Apr 7, 2015

Tomko said:
And the check engine light just cleared itself this afternoon.

Do you plan on taking any action or just observing?

Tomko

· #42 · Apr 7, 2015

diesel said:
Do you plan on taking any action or just observing?

I think I'll let it go for now. But if it comes up again, making for a third occurrence, I will take it in.

Tomko

· #43 · Apr 15, 2015

Had to take my wife's service dog to the hospital in St-Hyacinthe today. It's about three hours away.

On on my way back the P11D7 code recurred. Now for the third time... Incidentally when I stopped I noticed a vinegar odour.

Looks like I'll be bringing it in to the dealership once I'm back from Seoul.

diesel

· #44 · Apr 15, 2015

Tomko said:
Had to take my wife's service dog to the hospital in St-Hyacinthe today. It's about three hours away.

On on my way back the P11D7 code recurred. Now for the third time... Incidentally when I stopped I noticed a vinegar odour.

Looks like I'll be bringing it in to the dealership once I'm back from Seoul.

Keep us posted

Tomko

· #45 · Aug 6, 2015

So the car was brought in to the dealer about two weeks ago.

They did some research and told me that this code may set if the engine is run for less than a minute and then turned off. As well they discovered that a stud on the exhaust flange had broken off and was causing a leak. No idea how this could have happened although apparently it can be the result of "ice damage". They replaced the stud with a bolt and so far I haven't had a recurrence.

Reactions: 1

Tomko

· #46 · Aug 30, 2015

Vital P11D7 diagnostic information from Cruzator:

Cruzator said:
2014 Chevrolet Cruze 2.0L Eng Diesel

DTC P11D7 or P22FE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P11D7 NOx Sensor 2 Performance - Sensing Element Status Signal
DTC P22FE NOx Sensor 2 Performance - Sensing Element

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
NOx Sensor Ignition Voltage U029D, U029E, P220A, P220B U029D, U029E U029D, U029E, P220A, P220B -
High Speed GMLAN Serial Data (+) U0074, P205D U010E, P205D U0074, P205D -
High Speed GMLAN Serial Data (-) U029D, U029E, U010E, P205D U010E, P205D U010E, P205D -
NOx Sensor Ground - U029D, U029E - -

Circuit/System Description

The reductant system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine's exhaust gas. The first sensor is located at the outlet of the turbocharger and monitors the engine out NOx level. The second NOx sensor is located after the selective catalytic reduction (SCR) and monitors NOx levels downstream of the SCR.
Each NOx sensor contains a sensing cell, a pumping cell and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust.
The ECM varies the amount of diesel exhaust fluid (DEF) or reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out NOx levels.
The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.

Conditions for Running the DTCs

DTCs P0101, P0234, P0299, P0401, P0402, P140B, P140C, P2200, P2202, P2203, P2205, U029D and U029E are not set.

Battery voltage is greater than 11 V.

Ambient air temperature is greater than -7°C (19°F)

Engine speed is less than 1000 RPM for at least 10 s.

BARO pressure is greater than 75 kPa (11 psi).

EGT sensor 3 is between 50-500°C (112-932° F).

NOx 2 NOx Concentration is less than 200 ppm.

The DTC runs during key off after-run after the above conditions are met and the fault exists for more than 3 events during a key cycle.

Conditions for Setting the DTC

Due to aging and poisoning of the sensor element, the characteristics could change and have to be monitored. Therefore, a self diagnosis is implemented within the sensor control unit which is determining a measurement deviation in relation to a reference point defined during sensor production.
P11D7
The NOx sensor control unit sends a unique message to the ECM upon the self-diagnosis being aborted. The number of aborts is tracked by the ECM. If the number of self diagnostic aborts exceeds a threshold, the DTC is set.
P22FE
The NOx sensor self diagnostic result is received from the NOx sensor control unit and stored in a ring buffer, which takes the average of the last calibrated number of test results and averages them for comparison to an upper and lower calibrated threshold. If the average result is greater than or less than the calibrated thresholds, a NOx sensor self diagnostic fault will set.

Action Taken When the DTC Sets

DTC P11D7 and P22FE are Type B DTCs.

Conditions for Clearing the DTC

DTC P11D7 and P22FE are Type B DTCs.

Diagnostic Aids

DTC P11D7 may falsely set while the vehicle is in for service if the vehicle is connected to the repair facilities exhaust ventilation system. This is more prevalent in shops where ventilation systems have strong suction.

If the vehicle has been started and ran for less than 60 s, then shut down, DTC P11D7 may set.

Reference Information

Schematic Reference
Engine Controls Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Component View Reference
Powertrain Component Views
Description and Operation

Exhaust Aftertreatment System Description

Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level) , Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality) , Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering) , Diesel Exhaust Fluid (DEF) Warning Strategy (Emission Control)

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information.

Circuit/System Verification

Ignition On.

Verify DTC UXXXX is not set.

If a DTC is set Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

If no DTC is set

Verify the following conditions do not exist:

Induction system leaks - Refer to Induction System Smoke Test in Charge Air Cooler Diagnosis (Induction System Smoke Test) , Charge Air Cooler Diagnosis (Induction System Air Leak Test) .

Exhaust system leaks - Refer to Exhaust Leakage

Physical damage.

Soot plugged B195 NOx Sensor.

Loose or missing hardware.

Loose B195 NOx.

If a condition is found Repair the intake or exhaust system.

If no condition is found Replace the B195 NOx Sensor - Position 2.

Repair Instructions

Nitrogen Oxide Sensor Replacement - Position 2

Perform the scan tool NOx Sensor 2 Reset procedure after replacing the NOx sensor 2.

Control Module References for engine control module replacement, programming and setup.

Repair Verification

Install any components or connectors that have been removed or replaced during diagnosis.

Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.

Clear the DTCs.

Ignition Off, all vehicle systems Off, this may take up to 2 minutes.

Ignition On, perform the Reductant System Quality Test with a scan tool.

Engine idling for at least 5 min.

Ignition Off, all vehicle systems Off for 5 min.

Ignition On, verify the DTC is not set.

If the DTC is set A condition with the system still exists.

If the DTC is not set

All OK.

Reactions: 3

boraz

· #47 · Sep 12, 2015

P11D7 code today

crossing fingers its the running the car for short amount of time thing....driving it up and down ramps yesterday and today for servicing

diesel

· #48 · Sep 13, 2015

boraz said:
P11D7 code today

crossing fingers its the running the car for short amount of time thing....driving it up and down ramps yesterday and today for servicing

Be careful with that. Sequential short operation time can cause a DPF full condition if your timing is wrong (i.e during the start of a regen). For me it was pulling into bay at tire shop, shutting off, pulling out of bay, shutting off.

boraz

· #49 · Sep 13, 2015

diesel said:
Be careful with that. Sequential short operation time can cause a DPF full condition if your timing is wrong (i.e during the start of a regen). For me it was pulling into bay at tire shop, shutting off, pulling out of bay, shutting off.

yeah i saw your threads

wife came home and when she parked said it said 'something'...ugh...she thought it was a def message, the def is full, so it may have been a regen msg...no way to know

niblet

· #50 · Nov 3, 2015

Is there any recalls for the NOx Sensors on the diesels. I am seeing this same P11D7 alarm on my 2014. I have been into my dealership and all they have done is cleared it and said to keep an eye on it. I am currently under my extended warranty period and think I should have it replaced before it runs out. Any thoughts

Sent from AutoGuide.com Free App

revjpeterson

· #51 · Nov 3, 2015

niblet said:
Is there any recalls for the NOx Sensors on the diesels. I am seeing this same P11D7 alarm on my 2014. I have been into my dealership and all they have done is cleared it and said to keep an eye on it. I am currently under my extended warranty period and think I should have it replaced before it runs out. Any thoughts Sent from AutoGuide.com Free App

No recalls or extended coverages thus far on these parts. Doubt there would ever be a recall, since it doesn't have the potential to cause an accident or injury. An extended coverage would be nice, since almost every sensor in the emissions system has a new part number, indicating they have revised them in some way. I'm working on this same code right now. The good news is that it's an easy replacement and it doesn't really interrupt the function of the vehicle, except for preventing remote starts. The bad news is that it's a $260 part if you DIY and buy online (or $400 at dealer list price, plus labor).

On my journey with this code thus far, I have inspected all wiring for the sensor (since this code indicates an incomplete self-test, which could mean a failed sensor, but not necessarily), cleaned and greased the electrical connections leading to the sensor, and cleaned the sensor body. I think I'm going to move on to replacing the sensor next. Service manual says to smoke test intake and exhaust to check for unmetered air entering the system, but I don't have the gear for that, so I think I'm going to move on to replacing the sensor.

See less See more

diesel

· #52 · Nov 3, 2015

niblet said:
Is there any recalls for the NOx Sensors on the diesels. I am seeing this same P11D7 alarm on my 2014. I have been into my dealership and all they have done is cleared it and said to keep an eye on it. I am currently under my extended warranty period and think I should have it replaced before it runs out. Any thoughts

Sent from AutoGuide.com Free App

I have 141K miles on my diesel and have never had a problem with this sensor. i drive the car aggressively though and there are some theories that driving them hard keeps the sensors clean.

BlueTopaz

· #53 · Nov 4, 2015

P11D7 code today as well. I just turned 20k. So we will see what happens. I cleared it and now the wait begins.

On changing this sensor out. Any suggestions? Where is it located can anyone post some links in this thread to help those of us out that want to change it out ourselves? Part number for sensor would be nice. Also once it is changed, is there anything else needs to be done like flash the ECM to calibrate the new sensor?

revjpeterson

· #54 · Nov 4, 2015 (Edited)

BlueTopaz said:
P11D7 code today as well. I just turned 20k. So we will see what happens. I cleared it and now the wait begins.

On changing this sensor out. Any suggestions? Where is it located can anyone post some links in this thread to help those of us out that want to change it out ourselves? Part number for sensor would be nice. Also once it is changed, is there anything else needs to be done like flash the ECM to calibrate the new sensor?

I wrote up a how-to on changing the Particulate Matter Sensor a while back. The sensors are right next to each other and the procedure for changing them is identical. The original Particulate Matter Sensor How To: is at:

http://www.cruzetalk.com/forum/169-...matter-sensor-exhaust-particulate-sensor.html

The thread on the differences for changing NOX2 is at:

http://www.cruzetalk.com/forum/169-...ce-nox-sensor-2-rear-post-scr-nox-sensor.html

Thus far, I am not aware that it is necessary to do anything with the ECM to swap these sensors. I have seen passing references that a fuel trim reset might be recommended , but I don't recall seeing it in the service manual procedure for diagnosing this code (which was posted by another member a while back), so I am not certain that it is necessary.

Reactions: 1

money_man

· #55 · Mar 29, 2016

Just got this code today. 39200km, pretty sure this is the recalled sensor.

boraz

· #56 · Mar 29, 2016

money_man said:
Just got this code today. 39200km, pretty sure this is the recalled sensor.

mines been active since september

i clear it, it comes back within a week or so, clear it again, etc...

have experience no driveability issues though...still waiting to hear from dealer aboot parts for that recall

money_man

· #57 · Mar 30, 2016

Not the recalled sensor. Recalled sensor is nox #1, this code is for nox #2.

It's preventing my remote start from working, I also need them to replace my blower fan and my passenger headlight (orange reflector thing broke ) so I'm going to call and see if they'll do it all at one time.

plasticplant

· #58 · Jun 15, 2016

Add me to this list as well. P11D7 CEL this morning as I started the car up to head for work (64,000 mi). Sounds like most are clearing the code and seeing if it comes back? I have an oil change coming up on the 25th and will take the car in then for diagnosis. Is this part still backordered? Is this sensor covered under the emissions warranty? I was just without my car for 10 days getting my transmission replaced. I hope this isn't the start of "****" for me. This is my second CEL since I've had the car. That one proved to be the DEF heater. I have a road trip to PA planned the first week of July. The timing on this is pretty awful.

revjpeterson

· #59 · Jun 15, 2016

I was able to obtain my NOX2 sensor easily through Amazon or Ebay last summer, once the new part number began to work its way through the inventory stream. I think the shortage was during the transition to the new part number. The B2B warranty is the only one that covers this sensor, as far as I know. Even though I've now had to perform 4 emissions part replacements on my vehicle (2.5 years/57,000 miles), I have never had to replace the same part twice. Each time, my replacement has been an updated part, so I'm hoping this means that the updated parts are fixing the problem and its just the consequences of my buying a car during its first 3 months of production, before they worked out all the kinks. That's not to say that I don't think GM should step up and take (financial) responsibility for the original, flawed parts, but it at least makes me more confident about the vehicle's future.

plasticplant

· #60 · Jun 27, 2016 (Edited)

plasticplant said:
Add me to this list as well. P11D7 CEL this morning as I started the car up to head for work (64,000 mi). Sounds like most are clearing the code and seeing if it comes back? I have an oil change coming up on the 25th and will take the car in then for diagnosis. Is this part still backordered? Is this sensor covered under the emissions warranty? I was just without my car for 10 days getting my transmission replaced. I hope this isn't the start of "****" for me. This is my second CEL since I've had the car. That one proved to be the DEF heater. I have a road trip to PA planned the first week of July. The timing on this is pretty awful.

Just updating - I cleared the CEL and took the car out for over a 200 mile drive (mostly interstate). I drove it fast and furious and so far the CEL has not come back. I told the dealer about it at my oil change and he said they scanned it and no codes (or pending codes) were showing. It really looks like the fix is not driving like a grandpa and having some fun with the car; and of course getting it out on the highway regularly. My driving habits have changed quite a bit in the last year, so now I guess I'll need to start planning highway trips to keep this issue at bay...at least until GM gets a fix in place for the issue. I guess we'll wait and see, but it does look like they are working on a few things.

41 - 60 of 64 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.