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Spn 1569 fmi 31 - Isx in derate mode showing codes Engine 0 Fail 31 5246 1569 Discussion in 'Heavy D

Isx in derate mode showing codes Engine 0 Fail 31 5246 1569 Discuss

cummins fault code 4334 fmi 18. Okay thank you for that information. During the regen with the pressure dropping down that far there are a few things I would check. The draw on the system is greater during a regen due to the doser dosing into the decomp tube. I would remove the doser and perform the override test to make sure the doser is not ...SPN: 5246 FMI: 0/0. Fault Code: 3714: Engine Protection Torque Derate – Condition Exists. SPN: 1569 / FMI: 11/31. Cummins Fault codes 3712 and 3714. If these ...January 16, 2022 Have you been working on a Cummins ISX15 or QSX15 with fault codes 3714 and 3712 and you want to know how to fix and clear them? Read my guide and get …What is Code SPN 1569? 3 engine issues are associated with this error code. They are as follows: - Eng Prot Torq Fuel Derate Limit Condition Exist - Engine Protection - Power Derated Due To Other Faults This Code Occurs In Conjunction With 10516, 11000, 11003, 11004, And - Engine Protection Torque Derate Not Available Or Condition ExistsBryanC0506. TRC Master Service Tech. Associate of Applied Scienc... 217 satisfied customers. My boss has a 2012 international prostar last 8 of the vin. My boss has a 2012 international prostar last 8 of the vin CN600179 it has 3 codes loggedSpn 524285 Fmi 14 Count 1Spn 2023 instrument cluster Fmi … read more.No. Jun 29, 2022. #2 of 11. 1569 is engine torque derate so there is something else going on. Check for other codes to find out why - derate is a result of the system “protecting” the engine. More commonly its because of an emissions problem and there is no danger to the engine or anything else - more form of punishment for not attending to ...This 2012 Freightliner Cascadia came to the shop in derate! After plugging in the computer found out that the problem is corrosion to the scr harness! After ...Fault Code J1939 SPN J1939 FMI Lamp J1939 SPN Description Cummins Description QSB 6.7 QSL 9 QSX 15 QSB 4.5 QSF 3.8 QSG12 213 175 4 Amber Engine Oil Temperature 1 Engine Oil Temperature Sensor 1 Circuit - Voltage below normal, or shorted to low source XX 214 175 0 Red Engine Oil Temperature 1 Engine Oil Temperature - Data valid but above normal Hello I have a problem with a Cummins engine does not want to accelerate have some codes Spn 1761 fmi 9 Spn 3031 fmi 9 Spn 3364 fmi 9 Spn 2317 fmi 1 Spn 1569 fmi 31 Spn 62 fmi 0 Engine serial: 7391054 … read moreIt said SPN 1569, FMI 31 this is "fuel derate" according to manual. The other code was SPN 94, FMI 18 this is " fuel supply pressure ...Cummins QSF3.8 S/N 89921111 with DTC 3866 SPN 3364 FMI 1, The diesel exhaust fluid (DEF) quality has been detected to be below a critical threshold. To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute. The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.What is Code SPN 1569? 3 engine issues are associated with this error code. They are as follows: - Eng Prot Torq Fuel Derate Limit Condition Exist - Engine Protection - Power Derated Due To Other Faults This Code Occurs In Conjunction With 10516, 11000, 11003, 11004, And - Engine Protection Torque Derate Not Available Or Condition Exists Check Engine Code SPN 101 FMI 16 OC 3: DancinCampers: Freightliner Motorhome Chassis Forum: 5: 07-22-2016 07:12 AM: Check engine light SPN 3058 FMI 16: Keith Anderson: Freightliner Motorhome Chassis Forum: 2: 04-19-2015 11:11 PM: ISB fault 1682, SPN 3362, FMI 31 check engine codes: erstanfo: Cummins Engines: 4: 06-12 …SPN 310 FMI 0; SPN 1110 FMI 31; SPN 3703 FMI 31; SPN 3711 FMI 31; SPN 3719 FMI 0 . after this we replaced the coil and spark plug. at this point code SPN 4265 FMI 6 went inactive. everything else stayed the same. so we replaced the ARD combustion head. the truck is still throwing the same codes and refused to do a burn. engine s/n is sd01314SPN 310 FMI 0; SPN 1110 FMI 31; SPN 3703 FMI 31; SPN 3711 FMI 31; SPN 3719 FMI 0 . after this we replaced the coil and spark plug. at this point code SPN 4265 FMI 6 went inactive. everything else stayed the same. so we replaced the ARD combustion head. the truck is still throwing the same codes and refused to do a burn. engine s/n is sd01314Fault Code J1939 SPN J1939 FMI Lamp J1939 SPN Description Cummins Description QSB 6.7 QSL 9 QSX 15 QSB 4.5 QSF 3.8 QSG12 213 175 4 Amber Engine Oil Temperature 1 Engine Oil Temperature Sensor 1 Circuit - Voltage below normal, or shorted to low source XX 214 175 0 Red Engine Oil Temperature 1 Engine Oil Temperature - Data valid but …I have a 2016 kenworth T680 with a cummins ISX and im seeing the following fault codes: Fault code FMI Time SPN-88118 17 8:25 SPN-151117 19 8:25 SPN-1569 31 8:27 could you tell me what these are and h …2013 kw t660 with a paccar mx13 epa 10 motor fault codes are spn 1569 fmi 11. All i get from the truck is engine derated. Only running 75% of torque. Last week it blew the relay to the ECU and a wheel speed sensor, this derate issue just happened today. Any clue on them codes would be a great help.This spn fmi codes help explain the underlying meaning of the numerical components which build an engine fault code. ... SPN-1569-FMI-31; SPN-157-FMI-0; SPN-157-FMI-1; SPN-157-FMI-10; SPN-157-FMI-14; SPN-157-FMI-15; SPN-157-FMI-16; SPN-157-FMI-17; SPN-157-FMI-18; SPN-157-FMI-2; SPN-157-FMI-3; SPN-157-FMI-4;Note: SPN 1569 FMI 31 SCR tamperproof warning and protection system inducement often accompanies 3216-4. The description and special procedure for resetting an SCR tamper­proof code are contained in IK1201190. SERVICE PART(s) INFORMATION. Kit Description Navistar Part Number Cummins Part Numer (s) Quantity Required Ordering …2015 frieghtliner cascadia spn 3713 fmi 31. Replaced 7. 2015 frieghtliner cascadia spn 3713 fmi 31. Replaced 7 injector already. Please help. Answered in 3 minutes by: Technician: cumminsdr. cumminsdr, Mechanic. Category: Medium and Heavy Trucks.DESCRIPTION The purpose of this article is to define and inform on how to clear SPN 1569 FMI 31. FAULT OVERVIEW Fault code sets when any aftertreatment sensor or actuator is open or disconnected for at least 1 hour. After 1 hour (level 2), the engine will be de-rated by 25%.4 SPN 3719/FMI 31 -GHG17 4 SPN 3719/FMI 31 -GHG17 Silent Code that Logs when the Diesel Particulate Filter Regeneration Lamp is Flashing in "Regen Zone 2." NOTE: This code is informational only and used by service to help understand which dash lights illuminated during normal service. A stationary regeneration is required if the fault code is …DTC 1569.31 - Engine in Power Derate Condition - Continued. 5-3805-294-10). (Volume 5, WP 0794) ADVISOR. (Volume 3, WP 0375) engine. This code will only set as a result of another DTC setting. Warning. The ECU will limit the amount of engine speed in an attempt to protect the engine. The fault is SPN 1569 FMI 31 SPN 3226 FMI 19 SPN 1569 FMI 31 Three codes but seems two is repetitions of my scanner Is possible to call you here in Ghana Technician: Mike Mcmillan , Shop Foreman/Triage Tech replied 1 year agoSPN 1761 FMI 19. We checked this data sheet for Cummins fault codes, available at this link, and we did not find this number on it. In fact, we did not find any SPN 1761 codes listed on this data sheet. When we searched the internet, no website came up listing what this code is for or how to fix it. This code could refer to the DEF level in ...Causes for it to mess up are the sensor itself, the harness, the turbo charge air cooler leaking, or the turbo actuator not giving proper boost to the engine by not adjust the vanes properly. A bad ECM calibration can cause the SPN to fault as well. On the SPN 1761, fill the DEF tank.Fault Code: 3714 PID(P): SPN: 1569 FMI: 11/31 Critical fault codes related to engine operation are active. Possible reduced engine performance.This fault code is for information only, and indicates that an engine power derate has been implemented in order to make sure that the critical fault codes that are presently active in the ECM are addressed as …This spn fmi codes help explain the underlying meaning of the numerical components which build an engine fault code. - This is not a comprehensive list, or an alternative to the …Nich1019. Cummins/Caterpillar Techni... Vocational, Technical or Tra... 6,159 satisfied customers. Check engine light on after replacing engine batteries. Check engine light on after replacing engine batteries. Codes are spn 3216 fmi 9 and spn 3226 fmi 9 … read more.Truck Repair. 7,727. Verified. OK on your faults the 1569 is simply an inducement fault code which means the truck is in derate. The other faults that are present are for the def line heaters. What is almost always found with this issue is a def harness problem. There is a pdm near the def pump that the wires usually rub inside the panel or the ...fault code fmi description first detected last observed type SPN-21 4 Engine ECU Temperature (use SPN 1136) Oct 10, 5:21 PM Oct 10, 5:42 PM Intermittent SPN-6912 7 Transmission Internal Component 2 Speed Oct 10, 5:21 PM Oct 10, 5:21 PM IntermittentThis spn fmi codes help explain the underlying meaning of the numerical components which build an engine fault code. ... SPN-1569-FMI-31; SPN-157-FMI-0; SPN-157-FMI-1 ...SPN 310 FMI 0; SPN 1110 FMI 31; SPN 3703 FMI 31; SPN 3711 FMI 31; SPN 3719 FMI 0 . after this we replaced the coil and spark plug. at this point code SPN 4265 FMI 6 went inactive. everything else stayed the same. so we replaced the ARD combustion head. the truck is still throwing the same codes and refused to do a burn. engine s/n is sd01314Isx in derate mode showing codes Engine 0 Fail 31 5246 1569 Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Lilbit01, Sep 3, 2018. Sep 3, 2018 #1. Lilbit01 Bobtail ... 2015 Freightliner casscadia spn... Mad dog logistics llc posted Oct 5, 2023 at 3:01 PM. 2013 Kenworth T800 rear end hop... Bullitt posted Oct 5 ...Have code spn 1569 fmi 31. International 7600 vin is. This fault is a notification indicating SCR Tamperproof Warning and Protection Inducement is in effect. Check for any associated aftertreatment circuit faults. Once condition that caused original circuit fault has been repaired, SCR Faults Reset Request Procedure will need to be performed to ...The fault is SPN 1569 FMI 31 SPN 3226 FMI 19 SPN 1569 FMI 31 Three codes but seems two is repetitions of my scanner Is possible to call you here in Ghana Technician: Mike Mcmillan , Shop Foreman/Triage Tech replied 1 year agoTo use the table below, first write down the SPN and FMI codes you received from the engine diagnostic gauge. Locate each SPN in the first column and its associated definition to the right in the second column. In the same way, locate the FMI in the forth column and its associated definition to the right in the fifth column.The dreaded fault code that causes the 5 MPH derate! This fault is related to the “SCR Inducement” which is what regulates your truck to this derate. Cummins Fault Code – 3712 or SPN 5246 FMI 0. Notification – Red Stop Engine Light On. Information – Aftertreatment SCR Operator Inducement – Data Valid But Above Normal Operating Range ...Spn 1569 fmi 31. Spn 1239 fmi 16. spn1209 fmi 2 2015 t680. Cummings isx - Answered by a verified Technician. We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.Code SPN1569 FMI31. Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. Al im not sure if gary is familiar with your extreme knowledge in the engineering field. However I certainly am and am confident of exactly what you said, those codes are still stored undoubtedly. 2016 m2 with a code spn 1569 fmi 31. Freightliner m2 2016. I try do do most work in house but, kind of green on the def side if that is the problem ...Hi, I have a 2016 international prostar with the cummins in it. I have 2 active codes on it spn 641 fmi 9 & spn 1569 fmi 31. It's not running bad but the engine light with the arrow pointing down at t … read moreWhat the SPN 1569 FMI 31 Code Means The code stands for "Engine Protection Torque Derate Not Available Or Condition Exists". The fault code does not adhere to SAE J1939, which can make it such a pain to diagnose. Basically, the SAE J1939 Protocol is a set of standards crafted by the Society of Automotive Engineers (SAE).SPN 1569 FMI 31 - SCR Tamperproof Warning & Protection System Inducement Severe. Fault Overview. Fault sets when any aftertreatment sensor or …• SPN 94/FMI 15 or 16 Fuel Filter Plugged • SPN 157/FMI 1 Rail Pressure too High • SPN 164/FMI (All) Rail Pressure Sensor Faults • SPN 174/FMI 0 Fuel Temperature too High • SPN 1077/FMI 5 or 6 Quantity Control Valve Current • SPN 1077/FMI 14 High Pressure Leakage Too High • SPN 520251/FMI (All) PCV High Side ErrorSPN FMI Fault Description Diagnosis Circuit ECU Conn/ Pin 882 4 Marker lamps — voltage below expected value The BHM drives the 5 cab overhead clearance and ID lamps from connector B5, pin C on circuit 46. All other marker and tail lamps are driven from BHM connector B1, K on circuit 23. This circuit connects to the CHM as an input at ...They are:4364 18, 4094 31, 5246 0, 1569 31. Have replaced the doser/pump, flushed and filled the DEF tank, and cleaned the injector outlet. ... Count: 126 TxId: 0 SPN: 1569 – Engine Protection Torque Derate FMI: 31 Count: 7 TxId: 33 SPN: 6918 – SCR System Cleaning Inhibited Due to Inhibit Switch FMI: 7 (Not Responding Properly) Count: 1 ...Causes for it to mess up are the sensor itself, the harness, the turbo charge air cooler leaking, or the turbo actuator not giving proper boost to the engine by not adjust the vanes properly. A bad ECM calibration can cause the SPN to fault as well. On the SPN 1761, fill the DEF tank.My DEF light will not go off (tank is full). I think this is causing the check engine light to stay on. I have 2 faults showing at the dash panel: 1st one is: SA: 0 Engine SPN: 1569 FMI: 31 2nd fault is: SA: 33 Bulkhead SPN: 6918 FMI: 7 I have a 2017 DX3 / 37TS I'm the second owner and I'm not sure if any warranty is in effect that would help ...Sep 13, 2017 · 1 09-13-2017, 06:10 PM I have a 2016 International NH9 motor. Has only code spn 1569 fmi 31. I can not get any other codes off it. How do I reset this? What do I do its in derate but shows no other codes. Could a NOX sensor cause this? thanks rick Reply skitzo Location Offline Banned Thanks Given: 31 Thanks Received: 718 (547 Posts) Code SPN1569 FMI31. Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. Al im not sure if gary is familiar with your extreme knowledge in the engineering field. However I certainly am and am confident of exactly what you said, those codes are still stored undoubtedly.Spn 5392 Fmi 31SPN 521052/FMI 31 Description This Code Sets When SPN 521050/FMI ... fmi 31 ext aux eng shutdown switch active and spn 1569 fmi 31. Turn the ...SPN 1569 FMI 31 - SCR Tamperproof Warning & Protection System Inducement Severe. Fault Overview. Fault sets when any aftertreatment sensor or actuator is Open, disconnected, or bad DEF quality is detected for at least one hour. After one hour (level 2) engine will be de-rated by 25%.In this episode of Box Truck Bank, the Business Doctor explains how to clear active codes of SPN 111 & SPN 1569. A 2015 International 26 ft Box Truck with a 6.7L Cummins Engine and Allison...May 24, 2014 · SPN: 1569. FMI: 31. LAMP: Amber. SRT: Engine Protection Torque Derate - Condition Exists. Critical fault codes related to engine operation are active. Immediate engine power derate. This fault code will become inactive when all other active fault codes are resolved. Ask your own question now. This spn fmi codes help explain the underlying meaning of the numerical components which build an engine fault code. - This is not a comprehensive list, or an alternative to the …2016 m2 with a code spn 1569 fmi 31. Freightliner m2 2016. I try do do most work in house but, kind of green on the def side if that is the problem ...Sep 3, 2018 · I have a Cummins isx it's in derate mode it's showing codes on my dash which are Engine 0 Fail 31 5246 1569...i had the dpf/doc cleaned i changed the i map sensor also, i also did a park regen on it but after i drove it for about 30 minutes after that the yellow engine light came back on and once I stopped & shut it off then restarted it now the red/yellow light is on and in debate mode could ... 3 may 2018 ... This code indicates a problem with the DEF system. The DEF might be too low, bad, wrong mixture, frozen or some sensor is broken. One IRV2 forum ...Cummins SPN 5397 FMI 31. The equivalent Cummins code number is 3375 and it is the last code on page 16 of the complete Cummins fault code list we published earlier. The definition the company provides is as follows: “ Aftertreatment 1 Diesel Particulate Filter Regeneration too Frequent. Aftertreatment Diesel Particulate Filter Regeneration ...Apr 28, 2023 · Spn 1569 fmi 31 is showing, I got a 2012 Peter 587 Cummins isx. I replace a lot of parts already and I'm loosing powerSpn 1569 fmi 31 is showing, I got a 2011 VOLVO NL670 Cummins isx. I replace a lot … read more Fault Code: 3714 PID: S115 SPN: 1569 FMI: 31 LAMP: Amber SRT: Engine Protection Torque Derate - Condition Exists. Critical fault codes related to engine operation are active. Fault Code: 3712 PID: P10 …Just threw code FMI 31, SPN 4364. I just bought the truck and started driving it 2 days ago, - Answered by a verified Technician. We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. …SPN 310 FMI 0; SPN 1110 FMI 31; SPN 3703 FMI 31; SPN 3711 FMI 31; SPN 3719 FMI 0 . after this we replaced the coil and spark plug. at this point code SPN 4265 FMI 6 went inactive. everything else stayed the same. so we replaced the ARD combustion head. the truck is still throwing the same codes and refused to do a burn. engine s/n is sd01314Fault Code: 3714 | SPN: 1569 | FMI: 31 Engine Protection Torque Derate - Condition Exists 1 Check for primary fault codes 2 Technical Service Bulletin is available 3 ECM calibration revision history checkWhat the SPN 1569 FMI 31 Code Means The code stands for "Engine Protection Torque Derate Not Available Or Condition Exists". The fault code does not adhere to SAE J1939, which can make it such a pain to diagnose. Basically, the SAE J1939 Protocol is a set of standards crafted by the Society of Automotive Engineers (SAE).• FMI=4 - Voltage Below Normal, Or Shorted To Low Source • FMI=5 - Current Below Normal Or Open Circuit • FMI=6 - Current Above Normal Or Grounded Circuit • FMI=7 - Mechanical System Not Responding Or Out Of Adjustment • FMI=8 - Abnormal Frequency Or Pulse Width Or Period • FMI=9 - Abnormal Update Rate • FMI=10 - Abnormal Rate Of ... In this episode of Box Truck Bank, the Business Doctor explains how to clear active codes of SPN 111 & SPN 1569. A 2015 International 26 ft Box Truck with a ...2 SPN 521049/FMI 31 - GHG17 DEF Inducement DEF Lamp Active Table 1. SPN 521049/FMI 31 Description This Code Sets When There is a Code Present for the Diesel Exhaust Fluid (DEF) Tank Level, DEF Dosing Unit, DEF Pump, NOx Sensors, Blocked DEF Line, DEF Quality, NOx Efficiency, Selective Catalyst Reduction (SCR) Harness and/or …SPN 3363 FMI 16 1713 Aftertreatment 1 Diesel Exhaust Fluid Tank Heater - Data Valid But Above Normal Operating Range - Moderately Severe Level Amber Warning Light SPN 3364 FMI 10 4277 Aftertreatment Diesel Exhaust Fluid Quality - Abnormal Rate of ... SPN 4094 FMI 31 N/A NOx limits exceeded due to Insufficient Diesel Exhaust Fluid …Apr 10, 2021 · 2015 International Prostar code SPN1569 FMI31 Brookhaven66 Location Offline Senior Member Reputation: 8 Thanks Given: 311 Thanks Received: 104 (58 Posts) Posts: 352 Threads: 126 Joined: Dec 2017 1 04-10-2021, 08:31 PM (This post was last modified: 04-10-2021, 09:50 PM by Brookhaven66 .) Need help 2015 international prostar N13 scr,def,dpf truck Oct 6, 2016 · Spn 94 Fmi 17 Low pressure fuel signal slightly low Spn 1347 Fmi 7 Suction control valve circuit mismatch Spn 94 Fmi 3 Low pressure fuel signal out of range high. Spn 971 Fmi 31 External derate switch condition exists. Spn 1569 Fmi 31 Engine power derate condition exists. TxId: 0 SPN: 27 – Engine Exhaust Gas Recirculation 1 Valve Position FMI: 4 (Voltage Below Normal) Count: 126 TxId: 0 SPN: 1569 – Engine Protection Torque Derate FMI: 31 Count: 7 TxId: 33 SPN: 6918 – SCR System Cleaning Inhibited Due to Inhibit Switch FMI: 7 (Not Responding Properly) Count: 1 …SPN 3521 FMI 31 OC 3 Past SPN 3364 FMI 10 OC 19 SPN 5246 FMI 0 and 16 OC 9 LVSS, Feb 23, 2020. LVSS, Feb 23, 2020 #3 + Quote Reply. Feb 23, 2020 #4. Goodysnap Road Train Member. 3,351 7,946. Jul 12, 2017 0. I would say with faults you have listed, you most certainly have an issue with the DEF quality/level/temp sensor or …Cummins QSF3.8 S/N 89921111 with DTC 3866 SPN 3364 FMI 1, The diesel exhaust fluid (DEF) quality has been detected to be below a critical threshold. To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute. The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.SPN 310 FMI 0; SPN 1110 FMI 31; SPN 3703 FMI 31; SPN 3711 FMI 31; SPN 3719 FMI 0 . after this we replaced the coil and spark plug. at this point code SPN 4265 FMI 6 went inactive. everything else stayed the same. so we replaced the ARD combustion head. the truck is still throwing the same codes and refused to do a burn. engine s/n is sd01314Causes for it to mess up are the sensor itself, the harness, the turbo charge air cooler leaking, or the turbo actuator not giving proper boost to the engine by not adjust the vanes properly. A bad ECM calibration can cause the SPN to fault as well. On the SPN 1761, fill the DEF tank.2016 frieghtliner m2 with cummins engine. I have code psn- 1569 fmi-31. took it to a shop an, What the SPN 1569 FMI 31 Code Means The code stands for "Engine Protection Torque Derate Not Avail, Diagnostic Trouble Codes Text Translations provided by: PowerView Model PV101 software version Murphy 1.00.06. Pow, HAve a 2016 Freightliner m2 Code SPN 4364 and FMI 31. Model: MM106042s - Answered by a verified, SPN: XXXX FMI: XX Previously Active OC: XXX SA: XXX ... • FMI=21, This spn fmi codes help explain the underlying meaning of the nu, SPN FMI ACM2.1 FAULT CODE DESCRIPTION GHG14 3609 4 DOC Inlet Pressure Circuit Failed Low 361, TxId: 0 SPN: 27 – Engine Exhaust Gas Recirculation 1 , The fault code is MID 144 PID 191 FMI 5. THe truck won, Fault Code: 3714 | SPN: 1569 | FMI: 31 Engine Protection Tor, Oct 11, 2023 · Joined: Nov 2017. RE: High SCR outlet te, OK on your faults the 1569 is simply an inducement faul, Fault Information System (FIS) is a downloadable versi, The codes are SPN 1569 Fmi 31 and SPN 3362 FMI 31 suzzanne 2, Rabat Weather Forecasts. Weather Underground provides local, Spn 94 Fmi 17 Low pressure fuel signal slightly low Spn , SPN 5246 FMI 0 Cummins. This code is letting you know the final issue, Feb 1, 2023 · Technician: cumminsdr. Possible causes of this f.