Questions tagged [dtc]

Diagnostic Trouble Code

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13
votes
3answers
33k views

2005 Dodge Ram: Easy way to diagnose code P0420?

My truck is reporting a code P0420, which apparently is "Catalyst System Efficiency Below Threshold (Bank 1)" which can either be the catalytic converter or the rear O2 sensor. The code came on at ...
12
votes
1answer
489 views

Are widebands known to go lazy over time?

I know narrowbands can go lazy with time, but what about widebands? This is a sequel to the cold-start misfire mystery. It turns out that we were looking at the wrong PID's for the front O2 sensor ...
9
votes
2answers
1k views

How do I go about troubleshooting DTC codes?

When the check engine light (CEL) comes on, there is usually a diagnostic trouble code (DTC) that can be read from the OBD-II (onboard diagnostic) port on modern codes. How do I go about using the ...
9
votes
3answers
59k views

Do fault codes get recorded with a time stamp into a log with a history of DTCs?

Just scanned my vehicle for the first time to check out the code for a Check Engine Light. I grew curious if these fault codes get logged somewhere with a date and time stamp of some kind at the time ...
9
votes
2answers
3k views

1999 Subaru Forester - bad acceleration, rough shifting

I have a 1999 Subaru Forester with an automatic transmission and a 2.5 Liter Motor. It has poor acceleration and rough shifting I started to notice 'hesitation' on take off. It just slowly appeared....
8
votes
5answers
924 views

Looking for easy ways to set error codes

A lot of people want the check engine light to go off. I am doing some research for school and I want it to come on. Does anyone know some simple problems or faults I can create with a vehicle in ...
7
votes
1answer
106 views

06 Solstice LE5 DTCs

My love-to-hate-it relationship with the Solstice continues. I was having some issues with apparently-random warnings (ABS light, weird DTC, gas cap warning when the gas cap was not loose). The ...
6
votes
2answers
8k views

Any open-source OBD scanner analysis tools?

I've been having some weird problems with my '06 Pontiac G6, and finally broke down and bought a Bosch code scanner to see if the DTCs could tell me anything... they didn't. This scanner has the ...
6
votes
2answers
10k views

Where exactly is the Check Engine Light connector on a 1997 Honda Honda Civic?

The check engine light on my 1997 Honda Civic lit up. I came across a method for troubleshooting (http://honda-tech.com/showthread.php?t=1901557) but I'm having trouble finding the connector. Can ...
6
votes
2answers
1k views

Replace or Repair Mazda MPV 2000 faulty ECU?

I asked a question about troubleshooting ECU related short circuits. No more short circuits in the wiring harness, the only short left appears to be inside the ECU. This leaves me with a faulty ECU. ...
6
votes
1answer
2k views

2000 Audi A4 1.6 weak motor power

Just few days before I wanted to take Audi A4 B5 1.6 (year: 2000) to 'preventive' service. I've started the car normally, only the motor sound was very weird. So I tried to make a test drive. I couldn'...
6
votes
2answers
2k views

Decoding VW Airbag DTC from elm327

I am using PuTTY (similar to HyperTerminal) and elm 327 (OBD Link LX) on my VW Polo 2015 model to read Airbag DTCs. Command sent: AT SH 715 Received: OK Command sent: AT CRA 77F ...
6
votes
1answer
637 views

Check engine light with code P0455 comes on when fuel tank is below 3/4 full

In my 2001 Mazda Miata, the check engine light comes on when the fuel tank is at the 3/4 full mark. The code is DTC P0455 - Evap System Large Leak Detected I have replaced the fuel cap already. What ...
5
votes
1answer
2k views

Reading ABS diagnostic codes on a Volvo 940

I want to read any fault codes stored in my 1992 Volvo 940's ABS module. I've tried the procedure described in the popular 700/900 series FAQ without success. That procedure involves plugging the car'...
4
votes
2answers
1k views

Jeep Wrangler spark-plug issue

I just got the spark plugs changed because my 2009 6 cyl. Jeep Wrangler (with 70,000 mi) was throwing code for a misfire. After the change, it doesn't run as smoothly as before. It chugs and skips, ...
4
votes
1answer
236 views

Is the vehicle code gone or does a mechanic have to clear it?

So my truck had an emissions leak for the longest time therefore the check engine light was on and I had a code on it. I just replaced some parts on the truck and the check engine light turned off. ...
4
votes
2answers
5k views

Volkswagen Golf MK4 - Oil temperature sensor coding out

I have a Volkswagen Golf MK4 TDI 85kw (AJM). After driving for a while and stopping, when I turn the ignition on I get an "Oil sensor workshop" message. After connecting VCDS I got this fault: ...
4
votes
1answer
3k views

Hyundai Santa Fe 2004 3.5L Random Misfire hesitates when accelerating

I have a 2004 Hyundai Santa Fe 3.5L V6. When I was driving a couple of days ago the check engine light flashed and after a while it stayed on. The codes are P0300 which is a random misfire as well ...
4
votes
3answers
1k views

08 Audi A4 B7 2.0T DTC P0503 speed sensor erractic/high

I just finished reinstalling the intake manifold after cleaning the valves and went to start the car. It starts for about 2 seconds before shutting itself down. It throws 6 pending codes. P0503 - ...
4
votes
1answer
196 views

How do I get the most out of a “smart” OBDII scanner?

I recently purchased an OBDII scanner that allows me to read and log data using my tablet. How do I get the most out of this device? I am already familiar with simply reading the trouble codes to ...
4
votes
1answer
4k views

1999 Jeep Cherokee 4.0L electrical problems

I am new to this and in need of some advice. I just purchased a 1999 Jeep Cherokee 4.0L, with 211,000 miles and have some electrical problems. I noticed that one of the two green wires on the back ...
3
votes
4answers
44k views

How to fix P1167 in a 2001 Honda Accord, with a F23A4 engine

I used to have both P1166 and P1167 error codes on my 2001 Honda Accord (F23A4 engine). I fixed the P1166 by replacing the O2 sensor. For about a day, everything looked wonderful (i.e. no check ...
3
votes
2answers
86k views

Does the checkengine light clear itself on it's own or require manual clearning?

I was discussing the behavior a car's check-engine light. When a check-engine light comes on, can the check-engine light turn off on it's own or does the check-engine light always require manually ...
3
votes
1answer
40 views

Can lack of oil cause P0300 Random Misfire?

I get OBD code P0300 Random Misfire (and no other error codes) on a very poorly maintained car. I changed the valve cover (whose spark plug well gaskets were degraded) and spark plugs, but the engine ...
3
votes
3answers
169 views

Is hot desert weather the source of my recurring car problem?

I have a 2004 ford ranger with a short history of problems...the engine is v6 3.0L OHV. 1) It died 2 summers ago, stopped right in the road, around noon in the middle of July. I live in Tucson so it ...
3
votes
1answer
733 views

P2104 Throttle Actuator Control System Forced Idle error, but car runs fine

2 days ago, I had to jump start my 2009 Chevrolet Aveo. I suspect I left the interior light on all night which drained the battery. After I started the car, the engine warning indicator was on. (It ...
3
votes
1answer
82 views

Would my 2005 Focus's computer have a memory of past faults?

A little over a year ago the coil pack failed. Engine was underpowered because it only running on 3 cylinders. I took it to a local garage who replaced it and it's been running fine. Last week the ...
3
votes
3answers
29k views

what would cause the no.1 sparkplug to foul out 10 minutes after replacing it on a 1997 Buick 3.8 v-6 engine

About 6 months ago, I had some preventative maintenance done on my car that included oil change, plugs and wires. Within a week of running out of gas my car began "stumble" and idle rough. I ran ...
3
votes
1answer
7k views

VW Golf 6 2010 error code P2455

While driving, I heard a beeping sound from dashboard. When I looked at it, it showed "glow plug icon," it blinked 3 time and on the screen it said something like "Engine Fault - Workshop". Then I ...
3
votes
1answer
555 views

Mode 01 PID 01 OBD-II

https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_1_PID_01 Mode 01 PID 01 - Monitor status since DTCs cleared. In the 1st chart, B7 is 'Reserved' and must be 0. But for a few cars (like Skoda Rapid) ...
3
votes
0answers
1k views

BMW CAN bus data format

https://www.reddit.com/r/CANBus/comments/39pzpp/bmw_3series_2015_odometer_reading/ I am using the above website as reference and sending commands to engine ECU. I have a log from BMW engine ECU (below)...
3
votes
0answers
73 views

How to fix P0335 and P0727 error codes for Cadillac Catera 2000?

Make: Cadillac Model: Catera Engine: 3.0L Year: 2000 Error codes: P0335,P0727 Knowledge level: I know little about cars Help needed: Please help me find out what is going on and how to fix it.
2
votes
1answer
112 views

Do car manufacturers provide specific make/model/year information for each diagnostic-trouble-code?

Recently my car's check-engine light came on, I used a car OBDII port code reader to get the diagnostic-trouble-code (DTC) and then I googled what the DTC meant. I noticed that lots of the websites ...
2
votes
1answer
43 views

Can you see what version of ELM327 an OBD2 diagnostic scan tool/fault code reader supports?

According to https://en.wikipedia.org/wiki/ELM327#Other_Versions there is a handful of different versions of ELM327. If you buy a non-genuine ELM327-device (that is, something that is compatible with ...
2
votes
1answer
1k views

How are EVAP system leaks detected by the ECU?

I am curious which sensor(s) detects an EVAP leak and throw error codes, for example: P0442 - EVAP System Leak Detected (small leak) P0455 - EVAP System Leak Detected (large leak) My car is a 2003 ...
2
votes
1answer
151 views

Trouble Code decoding

I've got a trouble code in my car and unable to figure how to decode it. 008 0: 43 03 00 59 01 54 43 00 1: 01 55 AA AA AA AA AA I can understand the response is in multiple frames, but unable to ...
2
votes
1answer
7k views

Getting MIL on a Dodge Grand Caravan 2012 without an OBD device

I have a dodge grand caravan 2012 and yesterday, the check engine light went on. I know there's usually a way to get the error codes without an OBD device... I was able to do this on my old caravan ...
2
votes
1answer
112 views

Diagnosing silent misfires

2003 Honda Civic EX (~230,000 miles) has been giving me misfire codes for a while, mostly on cylinders 2 & 3, but sometimes 4. P0300 Random cylinder P0302 Cylinder 2 P0303 Cylinder 3 P0304 ...
2
votes
1answer
136 views

Error Codes Related to Transmission?

2002 Ford Mustang V6 My car started having a new problem yesterday. When I drive down the road randomly the pedal loses rpm's. For instance I'll be going 40mph and then there is no resistance on the ...
2
votes
0answers
220 views

2006 Mazda MX-5 P0126 + B1318

2006 MX-5 57k Miles USDM 2.0L 6-Speed P0126 and B1318 Set but no light on/Sporadic illumination. Coolant reservoir is full. https://www.obd-codes.com/p0126 That site references that there's a TSB ...
2
votes
0answers
1k views

OBD request trouble code mode 3 and mode 7

I'm trying to get my own app on phone to read Trouble code in car... I see that i have 3 mode to do this... first is to use the mode 01 with command 01 (but this command is generic) or the mode 03 and ...
2
votes
0answers
559 views

Check engine light is on but no codes provided when checking with reader [closed]

I have a 2004 Chevy Trailblazer. My check engine light is on, but I'm getting no codes when checking with reader only blank screen. How could this happen?
2
votes
0answers
172 views

trouble codes on a 1993 chevy silverado

when I hook my scanner up to view the check engine codes it says I have no power to my scanner. I tested all circuits and my fuses are all good. what could be my problem?
2
votes
2answers
5k views

Classifying a DTC as active, past or potential

Scantools always classify a DTC as active/current, history/past, potential/memory. How do they classify that? Sample raw data: 80 F1 5A 05 58 01 C1 00 20 0A Can you help classify it as past, ...
1
vote
2answers
71 views

Manually starting MIL(Malfunction Indicactor Light)

I want to know how can i manually start my Malfunction Engine Light (Check Engine Light) ? i actually want to generate a DTC so that i can see it on a OBD Scanner. I know even altering or removing/...
1
vote
2answers
3k views

Engine Code p0104 - EGR issues?

One of my family members owns a Ford Econoline E150 modified with a roof extender and power wheelchair lift, however the engine is a stock V8 which runs on regular gas. Anyway, after a fairly long ...
1
vote
2answers
9k views

DTC checking while engine running

Why it is said that DTC (Diagnostic Trouble Code) should not be checked when the engine is running?
1
vote
1answer
3k views

GM P0420 Code - Eliminating Possible Causes in Chevy G10

I have a 1996 Chevy G10 van with 14X,XXX miles on it. It has the 5.0 engine. I do not have a scanner myself, but, according to a shop, the van was throwing code P0420. According to my research, this ...
1
vote
0answers
36 views

P0101 and P2113 codes removal Kia Rio 2011

I have a KIA Rio Diesel car from 2011. With a diagnostic tool I have read the P0101 and P2113 DTC's: I had an old and problematic throttle body. I have replaced it with a completely new one and took ...
1
vote
0answers
25 views

Car jerking when engine warms up

Hey so my car drives great when the engine is cold, but once it warms up to 90 degrees it starts jerking a lot when pressing accelerator. I scanned the car and got codes: p0340(camshaft position ...