Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [dtc]

Diagnostic Trouble Code

86 questions
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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 about 30k miles, so I doubt it's the converter. So…
dave thieben
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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 voltages, assuming they were narrowbands. Probing…
Zaid
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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 they were thrown. I'm imagining some design…
jxramos
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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 code to figure out what might be wrong with my…
dlu
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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. Then I realized if I was trying to pass someone…
Steve Mcdaniel
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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 order to make the check engine light come on? These…
FooBot
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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 issues temporarily (for a few days) disappeared. Since…
3Dave
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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 Received: OK Command sent: 19 02 08 Received:…
Soumya Sen
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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. The diagram below explains how the entire circuit…
ElectronicsNewbie
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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 could be causing this? How do I diagnose this?
Charles Bradley
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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 ability to record stats from the car as it's running,…
Matt
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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 someone please tell me where this connector is? …
Mike B
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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't reach any higher/normal speed. From the car…
balex
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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's OBD lead into a numbered port, pushing a…
William Cline
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Faulty ECT DTC randomly on VW Golf 5

I have a problem with my car for about a year, related to the ECT sensor, which I always solved by clearing multiple DTCs (within this error, the fans work in failure, at maximum speed, even if it is 0 degrees outside). Today I decided to really…
LXSoft
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