Difference between revisions of "16785/P0401/001025"

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== 16785/P0401 - Exhaust Gas Recirculation Flow Insufficient Detected ==
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== 16785/P0401/001025 - Exhaust Gas Recirculation (EGR) System: Insufficient Flow Detected ==
  
 
==== Possible Symptoms ====
 
==== Possible Symptoms ====
  
* Drivebility problems (check dtc's with Knock Sensor)
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* Malfunction Indicator Light (MIL) ON
* Irregular behaviour
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* Reduced Exhaust Gas Recirculation (EGR)
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* Reduced Power Output/Engine running rough
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* Increased Emissions
  
 
==== Possible Causes ====
 
==== Possible Causes ====
  
* EGR valve stuck closed
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* Exhaust Gas Recirculation (EGR) Flow restricted/clogged
* EGR valve leaks vacuum
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* Exhaust Gas Recirculation (EGR) Valve stuck closed/leaking/faulty
* EGR flow restricted
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* Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve faulty
* Circuit EGR short to B+
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* Exhaust Gas Recirculation (EGR) System faulty
* EGR damaged
 
* Circuit DPF EGR sensor (differential pressure) disconnected, short to B+ or Ground
 
* DPF EGR sensor downstream hose off or plugded
 
* DPF EGR sensor damaged, wrong attached
 
* Control Module damaged
 
  
 
==== Possible Solutions ====
 
==== Possible Solutions ====
  
* Check all wiring and connections to and from EGR and DPF-EGR
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* Check/Clean Exhaust Gas Recirculation (EGR) System
* Check the EGR: use a vacuumpump and pull open the EGR: rpm should change
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* Check/Replace Exhaust Gas Recirculation (EGR) Valve
* Clean the EGR
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* Check Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve
* Check / Replace EGR
 
* Check / Replace DPF-EGR
 
  
 
==== Special Notes ====
 
==== Special Notes ====
  
* The EGR system is monitored when driving at steady state and the EGR is commanded on. When the DPF-EGR sensor indicates that EGR flow is less then a desired minimum a dtc is set.
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When this fault is stored in a 2009-2012 NAR market [[2.0L CR TDI]] (CBEA, CJAA, CKRA) VW Jetta/Golf (1K/AJ) or the NMS Passat (A3) chassis:
* N.B. mechanics with less knowledge do exchange the EGR often, but 75% sure the problem will be back (probably the DPF-EGR sensor causes the problem).
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*Please see: TSB 26-13-03 | TPI# 2031583/3 (''formerly know as 26-12-08 | TPI# 2031583'').   When the Exhaust Pressure Flap Control Module (J883) is faulty, the engine controller may have any of the following DTCs:
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**[[P047F/00115 | P047F/001151 - Exhaust Pressure Control Valve: Stuck Open]]
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**P0477 - Exhaust Pressure Control Valve "A" Low
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**[[P048A/001162 | P048A/001162 - Exhaust Pressure Control Valve 1: Stuck Closed]]
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**P048B - Exhaust Pressure Control Valve "A" Position Sensor/Switch Circuit
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**P048C - Exhaust Pressure Control Valve "A" Position Sensor/Switch Circuit Range/Performance
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**[[16785/P0401/001025 | 16785/P0401/001025 - Exhaust Gas Recirculation (EGR) System: Insufficient Flow Detected]]
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* Some TDI-CR engines have a filter for the EGR that can become restricted and cause a "Insufficient Flow" code.
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 +
 
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When this fault is stored in a 2009-2014 NAR market [[2.0L CR TDI]] (CBEA or CJAA ) VW Jetta/Golf (1K/AJ)
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*Please See TSB 01 14 11(''Updated: 01 14 21'') | TPI# 2034898
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** May also have fault code stored in ECM
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***[[18895/P2463/009315 | 18895/P2463/009315 - Diesel Particle Filter: Excessive Soot Accumulation]]
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* Restrictions in the EGR Filter may occur after a regeneration, if the soot loads where high before the regeneration.
  
 
[[Category:Fault Codes]]
 
[[Category:Fault Codes]]

Latest revision as of 12:36, 6 October 2015

16785/P0401/001025 - Exhaust Gas Recirculation (EGR) System: Insufficient Flow Detected

Possible Symptoms

  • Malfunction Indicator Light (MIL) ON
  • Reduced Exhaust Gas Recirculation (EGR)
  • Reduced Power Output/Engine running rough
  • Increased Emissions

Possible Causes

  • Exhaust Gas Recirculation (EGR) Flow restricted/clogged
  • Exhaust Gas Recirculation (EGR) Valve stuck closed/leaking/faulty
  • Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve faulty
  • Exhaust Gas Recirculation (EGR) System faulty

Possible Solutions

  • Check/Clean Exhaust Gas Recirculation (EGR) System
  • Check/Replace Exhaust Gas Recirculation (EGR) Valve
  • Check Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve

Special Notes

When this fault is stored in a 2009-2012 NAR market 2.0L CR TDI (CBEA, CJAA, CKRA) VW Jetta/Golf (1K/AJ) or the NMS Passat (A3) chassis:


When this fault is stored in a 2009-2014 NAR market 2.0L CR TDI (CBEA or CJAA ) VW Jetta/Golf (1K/AJ)