[dixy2k]

Using the Torque app I have this code even after I cleared it.

"Historic Fault" P0401 - Powertrain
Exhaust Gas Recirculation Flow Insufficient Detected

It is highlighted in green.


I had one of the intercooler hoses come off yesterday and a bunch of codes came soon after that happened.
The hose was placed back in and (I hope) the codes were cleared.

Does anyone have an idea what this might be?

[JDG]

I have that code, but my EGR flow is restricted. I.E. blocked

[dixy2k]

My EGR valve is not restricted/blocked.

[dixy2k]

When it happened I got the following codes:
P0401
P2279 intake ari system leak
P0299 powertrain
P0101 powertrain mass or volume air flow circuit range/performance problem


Apparently P0401 is persistent even after clearing the codes by the dealer (I hope) and once by myself.

[Brad335d]

Since you have only GENERIC OBD II codes and not OEM codes there are 2 OEM codes that could store under the Generic P0401 code:


4501 - P0401

Information saved in
DDE

Fault code
4501 - P0401

Fault text
DDE: Exhaust-gas recirculation, control deviation: Air mass
too high/negative control deviation

Fault description
The diagnostic trouble code is logged in the ECU when the
exhaust-gas recirculation system's negative control deviation
falls below a limit defined based on the operating point.

Condition for fault identification
Test condition:
The test runs every 20 ms when the exhaust-gas
recirculation control system is activated, the monitoring
system is enabled and no other system fault is present.
Voltage condition:
The test runs every 20 ms when the exhaust-gas
recirculation control system is activated, the monitoring
system is enabled and no other system fault is present.

Condition for fault memory entry
Debounce (7500 ms)

Action in service
Check the following potential problem sources:
Leaks in mass airflow system on engine side of compressor
Leaks in exhaust system on engine side of turbine (combined with mass airflow plausibility errors).
Throttle valve defect (in combination with throttle valve faults).
Defective EGR valve (in combination with EGR valve errors).
Defective turbocharger (in combination with turbocharger faults).
Severe EGR cooler soot accumulation. Applies to engines with single-stage boost: Conduct mass
airflow system test.

Fault effect and breakdown warning
It is possible to continue driving the vehicle, emissions
deteriorate.
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL

Service instruction
Note collateral effects on boost-pressure control (faults in
the exhaust-gas recirculation system can affect the boost-
pressure control system).
Check diagnostic trouble codes for the named components.

© 2014 ALLDATA LLC. All rights reserved. Terms and Conditions



4B82 - P0401

Information saved in
DDE

Fault code
4B82 - P0401

Fault text
DDE: Exhaust-gas recirculation-rate control, control
deviation: Exhaust-gas recirculation rate too low/positive
control deviation

Fault description
The diagnostic trouble code is logged in the ECU when the
exhaust-gas recirculation system's flow rate control's
positive control deviation exceeds a limit defined based on
the operating point.

Condition for fault identification
Test condition:
The check runs every 20 ms when the specified value
priority assignment is set to flow rate and no other errors
related to the exhaust-gas recirculation have been detected.
Voltage condition:
The check runs every 20 ms when the specified value
priority assignment is set to flow rate and no other errors
related to the exhaust-gas recirculation have been detected.

Condition for fault memory entry
Debounce (4000 ms)

Action in service
Check the following potential problem sources:
Mass airflow system on engine-side of compressor is leaking.
Leak in exhaust system upstream from turbine.
Defective boost pressure actuator/exhaust turbocharger (in combination with errors related to the boost pressure
actuator).
Defective EGR valve (in combination with EGR valve errors).
Throttle valve defect (in combination with throttle valve faults).
Severe EGR cooler soot accumulation. Applies to engines with single-stage boost: Conduct mass
airflow system test.

Fault effect and breakdown warning
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL

Service instruction
Check diagnostic trouble codes for the named components.

© 2014 ALLDATA LLC. All rights reserved. Terms and Co

[dixy2k]

thank you