P0505

Idle Control System Malfunction

DTC P0505, sometimes indicated as P050500 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the engine idling stability causing idle control system malfunction.

This code means that the idle control system is not working properly. There are a few things that could cause this:
-A dirty throttle body could cause the engine to idle too high or too low.
-A faulty idle air control valve could cause the engine to idle too high or too low.
-A vacuum leak could cause the engine to idle too high or too low.
-The engine's ECU could be malfunctioning.

  • P0505: Idle Control System Malfunction
  • P0505: Idle Air Control System
  • P0505: Idle speed control (ISC) system – malfunction
  • P0505 00: Idle speed control (ISC) system - malfunction
  • P0505 00: Fault in the idle speed control system

See Also: Related Error Codes
DTC Trouble Code Search
Bulletins

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

  • LTB00606NAS1 - ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
    LAND ROVER: Engine mil illuminated with dtc P0505-8f and P2282-00 stored and misfire
  • TSB-12-7-4 - ENGINE (PWS)
    MERCURY: Ford/lincoln/mercury: if battery was disconnected or dead, vehicles/trucks may experience hard starts and engine idle rpm fluctuation and exhibit diagnostic trouble codes (dtcs) P0505, P0506, P2111 and P2112. *pe
  • TSB-0184-09 - ENGINE AND ENGINE COOLING:ENGINE
    TOYOTA: Toyota: vehicles with 2gr fe engines may exhibit a mil on condition with diagnostic trouble code (dtc) P0505 stored in the engine control module or ecm (sae term: powertrain control module/pcm). *pe
  • 08-5-13 - POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
    LINCOLN: 4.6l/5.4l--mil P0506 and/or P0505--hesitation/loss of rpm/difficulty starting/low idle rpm. *nj
  • 804 - ENGINE AND ENGINE COOLING
    HONDA: Dtc (diagnostic trouble code) P1684, idle fluctuation and or dtc P0505. *sc
  • ITB00030 - VEHICLE SPEED CONTROL:CRUISE CONTROL
    INFINITI: Subject regarding diagnostic trouble code P0505 due to incorrect idle speed. *tt
  • NTB00041 - VEHICLE SPEED CONTROL:CRUISE CONTROL
    NISSAN: Some vehicles may exhibit a diagnostic trouble code P0505 aac/v stored, with no customer driveability incident, due to incorrect engine idle speed setting. *tt
  • NTB98039 - UNKNOWN OR OTHER
    NISSAN: Vehicle with (mil) malfunction indicator lamp on and (dtc) diagnostic trouble code P0505 stired ub ecm. *yc
  • NTB97094 - UNKNOWN OR OTHER
    NISSAN: Vehicle has a mil 'on' and dtc P0505 stored in the ecm. *yc
  • 97111097235 - ENGINE AND ENGINE COOLING:ENGINE
    FORD: Subject regarding malfunction indicator lamp (mil) illuminated with diagnostic trouble code (dtc) P0505. *yc
  • 97050110631 - ELECTRICAL SYSTEM:IGNITION:MODULE
    FORD: Customer concerns of mil (malfaunction indicator lamp) and dtc's of P0505 and/ or po140. *yc
  • BC0304A97020 - VEHICLE SPEED CONTROL:CRUISE CONTROL
    FORD: Concerns of dtc P0505 that are not resolved by following pp tests. *tw
  • BC0304972301 - ELECTRICAL SYSTEM:IGNITION:MODULE
    FORD: Mil light on with dtc P0505. *jd
  • NTB97008 - VEHICLE SPEED CONTROL:CRUISE CONTROL
    NISSAN: If a vehicle experiences a mil "on" and dtc P0505 stored in the electronic control module- due to a reverse in polarity of the iacv-aac valve power source, normal operation of the iacv-aac valve may be affected causing the mil to activate.
Known Recall Investigations
  • Ford Motor Company - Idle instability Defect Investigation # PE11018

    On november 29, 2012, ford motor company (ford) initiated customer satisfaction program 12n03 to extend warranty coverage terms for repair of engine idle rpm surge caused by throttle body deposits in all model year (my) 2005 through 2007 ford freestyle, five hundred and mercury montego vehicles.The program extends the coverage for up to 10 years of service or 150,000 miles from the warranty start date of the vehicle (all vehicles are eligible for the program through may 31, 2013, regardless of mileage).Dealers will repair vehicles exhibiting the condition by removing and cleaning the throttle body and reprogramming the pcm with software containing an updated idle speed control strategy.According to ford, some of the affected vehicles may experience momentary, intermittent engine idle rpm surge (idle flare) when stopped or during low speed driving maneuvers such as in a parking lot or driveway.Unstable idle speed control (dips and flares) around the target engine speed (700 rpm) can occur in vehicles with deposit build-up in the throttle body when the system adjusts engine speed in response to changes in engine load, typically from power steering application or air-conditioner compressor cycling.Idle speed control logic is only active at vehicle speeds below 3.5 mph and when the accelerator pedal is not applied.Ford testing of a vehicle with a "worst case" throttle body measured a maximum idle flare of 1360 rpm lasting approximately 1 second, which ford indicated was consistent with system design to limit vehicle speed and acceleration in idle control mode.Ford indicated that the test vehicle was held in place with normal brake effort and that vehicle speed remained under 4 mph without the brake pedal applied.In addition to throttle body deposit accumulation, symptoms associated with the condition may include check engine lamp illumination and diagnostic trouble codes (dtcs) P0505, P0506 or P061B.Ford attributed the surge condition to changes in idle air flow resulting from the progressive buildup of deposits in the throttle body from normal positive crankcase ventilation (pcv) system operation.This condition was not adequately compensated for in the original powertrain control module (pcm) calibration.Ford issued a technical service bulletin on august 15, 2011 (tsb 11-8-5), releasing an updated powertrain control calibration for vehicles with cvt transmissions.On october 19, 2011, ford issued a second bulletin (tsb 11-10-21) superseding tsb 11-8-5 and including updated powertrain control calibration for vehicles with 6-speed transmissions.Prior to ford issuing the tsb?S, owner?S experiencing the alleged defect either received no repairs, if dealers could not duplicate the condition, or had the throttle body cleaned or replaced, which only provided temporary correction until the throttle deposit build-up returned.Ford?S revised powertrain calibrations appear to be effective remedies for the idle instability caused by build-up of throttle body deposits.However, even after the tsb?S were released, many owners experiencing the condition continued to have difficulty with proper diagnosis and repair as dealers were often either unable to duplicate the condition or were unfamiliar with the new repair procedures.Fords new program addresses those concerns.Nhtsas testing and complaint analysis indicate that the idle speed control issue in the subject vehicles can only occur at very low speeds, are very brief events, are easily controlled by moderate brake pedal forces and result in minor increases in vehicle speed even with no braking.This investigation is closed.The closing of this in

Consumer Complaints for this DTC



2018 TOYOTA CAMRY

Check engine light came on and the performance of the vehicle is bad. Bad idle, weak engine, just the car is not performing properly. I used the scanner to see the code and i had more than one . P0171 P0505 P117B P0441 P0455 . Fuel/air mixture is lean . And i hear the fuel pump making that noise that indicates a bad fuel pump. It's when i put the key in i hear it loud enough and if i turn the key on it does it again. When i put it on p it revs and rpm goes up and then comes down, up again down again ... When stopped at a red light the car wants to move and rpm keeps shaking.
FUEL/PROPULSION SYSTEM, FUEL/PROPULSION SYSTEM ENGINE ENGINE



2010 FORD F-150 with 9230.0 miles

My Ford F-150 truck(milage,529) has stalled or lost power and stalled 10 times on 5 different occasions. The problem started on 01-14-11. The first two visits to the dealer they could not duplicate the condition or find a code in the computer. No mechanical work was performed. On 01-26-11 the wrench appeared, i drove directly to the dealer. The tech found two conflicting codes. He e-mailed Ford tech center with the problem. On 01-28-11 they replaced the throttle body. (code P0505) on 02-01-11 truck stalled again, this time they replace the resonator(pin point leak to the resonator hose code P0102 at 9511 miles. On 02-08-11 truck stalled at a stop sign. ( no wrench) on 02-15-11 truck stalled twice (wrench showed up ) at mileage 9,525- 14 miles since the resonator work. On 02-16-11 i had a meeting with the service manager. He was very courteous and professional. I gave the service manager a copy of a report on problems for 2010 Ford F-150 trucks. (www.Arfc.Org) i understand this information is from the national highway traffic safety administration (www.Nhtsa.Gov) this way they can not say they never heard of the problem. On 02-16-11 truck was returned to dealer. This is a very dangerous condition. The truck stalls between 10 and 40 mph you lose the ability to steer the truck.On one occasion i was turning into my property making a left turn. I was going slow so i was able to stop before i hit a snow bank. Once you lose power steering there is no way to steer the truck and the breaks fade very fast.
ENGINE AND ENGINE COOLING:ENGINE,



2005 FORD FIVE HUNDRED with 100000. miles

Bought the vehicle used in may 2010. Realized early-on that the transmission was not smooth, but willing to settle for less than perfection since it was a 2005 vehicle. In late 2012 or early 2013, i received 'recall' notice that pcm (i.E. - powertrain control module) could need to be reprogrammed due to stalling, herky-jerky transmission, etc. Took car to dealership, they ran diagnostics, charged me $100, and told me that my car wasn't effected because no error codes were noted and check engine light wasn't on. I was not happy, and refused to take my car to the dealership for repair. Problem persisted, until check engine light came on in october 2017 at roughly 125,000 miles. Took to local mechanic, was charged $150 for sensor replacement. Light came back on a day later. Took back, replaced sensor for free (nice!), but light back on a day later. Took to a different mechanic, was charged $250, replaced multiple sensors, light back on the next day. Took back to 2nd mechanic, when they shared with me that it was likely the pcm and the dealership would need to fix. Called dealership 3 days in a row, on hold for nearly an hour the 3rd time, was never connected to a service writer or tech, left 3 voice mails for service manager and was never called back. Researched issue and found nhtsa action number pe11018, where Ford initiated a customer satisfaction program 12n03 to extend coverage terms of repair of engine idle rpm surge caused by pcm needing reprogramming with software containing updated idle speed control. Per nhtsa, symptoms associated with the condition may include check engine light, diagnostic codes (dtcs) P0505, P0506, or P061B. Ford issued bulletin tsb 11-10-21 that included updated powertrain control calibration.
ENGINE, FUEL/PROPULSION SYSTEM POWER TRAIN



2004 JEEP GRAND CHEROKEE with 25000.0 miles

I own a 2004 Jeep Grand Cherokee limited......I took my car in for the seat heater recall and since then i have terrible problems with the sudden acceleration of the car....(700rpms to 1800) i constantly have to push the brake down and be very conscious of keeping my foot on the brake. The check engine light then came on with a P0505 code. Air intake sensor. Well a new one was put in and the problem was not resolved. The mechanic could not control the idle even with the diagnostic computer attached to it. It was found that two wires on the wiring harness were shorting out and melting......Then after driving approx 1200 miles the idle starts jumping again.....The check engine light come on about two days later......Then within the same day the idle calms down and the check engine light goes off. I have paid lots of money to have this repaired.....I believe that there is a short somewhere from the seat heater recall since the car did not do this prior to having the dealership fix the seat heater with the recall. I really like my car when the idle is right ........I am not comfortable having anyone else drive it due to this issue and do not always feel safe when the acceleration goes wild.....Please help.....This is a major safety issue that needs to be addressed quickly before other people get hurt or killed.
VEHICLE SPEED CONTROL, ELECTRICAL SYSTEM:WIRING SEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER



2002 HONDA ODYSSEY with 74560.0 miles

When we are going uphill from full stopped it seems the transmission is not picking up and it sounds like slippage of the gear. Then the yellow check engine indicator lights up and when we got home i grabbed my code reader and says P0730 incorrect gear ratio and P0505 idle. There is no crash but almost because the car behind us are really fast going uphill and because im not pressing the brake so most likely he didn't see that were are not moving with the current flow of traffic plus it happened at night at around 11:05 pm after i dropped off my wife to work. My foot is in the gas pedal when i noticed we are not accelerating no matter how much you press the gas pedal. All you can hear is slippage of gear but idle is going up without power.
POWER TRAIN, VEHICLE SPEED CONTROL ELECTRICAL SYSTEM



2001 NISSAN MAXIMA with 95025.0 miles

While driving at approximately 30 mph and decelerating the car began to slightly buck when the transmission tried to down shift. After approximately one to two minutes i smelled an electrical burn. When i came to a stop and put the car in park the engine raced to approximately 1600 to 1900 rpms at idle. The obd-ii indicated codes of P0505: idle air control valve and P0420: three way catalyst function. My local mechanic inspected the car and replaced the faulty idle air control valve. He contacted the local Nissan service shop, and they informed him that idle air control valve failed and shorted the engine control module, ecm. This seemed to be a common problem the dealer noted, and currently had another 2001 Maxima in the shop that was exhibiting the same failures. The dealer inspected my car and reported the idle air control valve failed and shorted the ecm. The failure of the idle air control valve should not short the ecm. This is a design failure and should not be the responsibility of the car owner. The ecm is a $915 part plus labor. The ecm was replaced. This is similar to odi id numbers: 10179328 and 10179390. *ak
VEHICLE SPEED CONTROL, ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL



2001 NISSAN SENTRA with 148948. miles

The service engine soon light went on 2/1/09. Trouble was reported on 2/5/09 when vehicle was delivered for service at midas auto service, 463 glynn st., fayetteville, ga. Refer to invoice where a relay/ecm was replaced. The vehicle was driven home to owner's residence at 6302 morgan place ct., atlanta, ga. A potentially catastrophic event followed when the owner was driving the vehicle was driven on an atlanta interstate and the car cut off and a serious wreck was somehow averted. Vehicle was subsequently towed to firestone complete auto care; 2460 n druid hills rd. Ne. Symptom was described: ''cut off while driving. Oil light and battery light came on first'. The service report said in part, 'has blown ignition fuse and no power to the coils, replaced fuse and everything seems to be working ok. The remaining comments can be found in the service report. Vehicle was driven home. Next problem occurred on 2/9/09 when owner was leaving to go to work in the morning. The vehicle engine cut off on a local route. The car was subsequently towed to midas auto service, 6550 roswell rd., sandy springs, ga. The diagnostic package revealed, '' codes P0140, P0505, P0137, and P0460 which indicated a total emissions failure on the cat converter and all four o2 sensors. Subsequently, the vehicle ignition relay circuit (relay replaced 2/1/09) repeatedly blew fuses. The vehicle was subsequently driven back to midas auto service, 463 glynn st., fayetteville, ga without incident. The diagnostic evaluation and subsequent research indicated that the ecm module was defective. The safety recall from nhtsa campaign id no. 03v477000, came up in the midas research and it was determined that the lining material from the ecm box had not been replaced.
ELECTRICAL SYSTEM, ELECTRICAL SYSTEM:IGNITION:MODULE



2001 INFINITI I30 with 110000. miles

I was driving the car the engine was warm and running just fine. Then out of no where the car at 40 mph engine begin wildly revving the rpms went directly home and in park it was doing the same thing. Turned it off called a tow truck had it towed in to local shop. A check engine light came on showing a P0505 code. The shop replaced the iacm and then the ecu at a cost of over car was returned same code and check engine light on the mechanic said it would not relearn idle and to drive it around and see if that would help. I am an elderly woman and i spend the next few days riding the brake to keep the car in control. Idle was running high in park and drive. I was becoming afraid of the car and decided to take it to the Infiniti dealer for repairs. With same P0505 code and check engine light and in less then seven days the iacm and ecu once again needed to be replaced. That's because the motor mounts failed and since they are fluid filled they leaked causing the other parts to short out. The Infiniti dealer said the three parts are all on the same circuit but this is only known to Infiniti mechanics. The repair is now over $3000.00 pus the first charge. This is way more then my car value. I researched this condition on the internet. Kids have been driving these cars when the failure occurs at 80 mph with both feet on the brake. I never write anything on the internet but i am concerned this is going to cause a crash and someone may be seriously hurt. Car has 110000. Miles i will pay for the repairs out of pocket but i think this should be a recall.
ELECTRONIC STABILITY CONTROL,



2000 NISSAN MAXIMA with 100000. miles

Awareness needs to be made on the 2000 Nissan Maxima, the car will have a ecu breakdown resulting in the car to shut off at any given time. A trouble code of P0505 will trigger off in the car resulting in an insane repair cost. Numerous cars are affected and Nissan refuses to perform a recall on this car. Its a matter of time before one of these Nissans shuts down at the wrong time resulting in someone's death. There are pages upon pages of posts with this problem.
ELECTRICAL SYSTEM,



2000 TOYOTA TUNDRA

It was determined that all 4 oxygen sensors needed to be replaced. The consumer found that there was an extended warranty, but was told that the problem wasn't bad enough for a total recall. *sc recall campaign: recall number: 99v347003. The towing packet light kit had blown out and was replaced. The consumer stated that the engine light has been on since purchase of the vehicle. Vehicle stalled while being driven by the consumer. When started again the check engine light appeared. After having the vehicle checked again it registered a code of P0505/possible idle control system. *tc
ENGINE AND ENGINE COOLING:ENGINE, EXTERIOR LIGHTING:TAIL LIGHTS



1998 HONDA ACCORD with 80000.0 miles

Tl*the contact owns a 1998 Honda Accord. The contact stated that the engine light was illuminated, but eventually dimmed. The service dealer stated that they would charge her just to inspect the vehicle. The dealer advised her to return when the failure recurred. The engine light illuminated again one year later. The contact returned to the service dealer who stated that the vehicle was only guaranteed for 80,000 miles. The codes issued by the maintenance technician regarding the failure were P0420, P0505, and P1456. The purchase date and powertrain were unknown. The current mileage is 97,596 and failure mileage was 80,000.
ENGINE AND ENGINE COOLING:ENGINE,

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