Question about 1994 Chevrolet Silverado 2500

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How do you clear trouble codes on a 94 GM 6.5 diesel? Disconnecting battery power does not do it.

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Take it to autozone or a major auto supply house and have them use the fault code reader to read it for you, they usually do this for free and will tell you what the error codes are if it is something simple it can possibly be repaired right there and if not you need to take it to a mechanic. Disconnecting the battery will not clear a fault if the fault still exists.

I hope this helps you with your issue.

Stormi

Posted on Nov 13, 2010

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Can anyone tell me what this is on my suburban?


That is the ODB11 Code Reader Port. When your engine malfunction light comes on, you attach a code reader to that socket and the machine give a P Code. That code tells the problem as stated from the ECM (engine control module.

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My 2006 Chev Impala 3.5l v-6 just showed trouble code P0690. I cleared the code by disconnecting the neg battery lead. It was ok for first start but showed again on the second start. What is it?


POSSIBLE CAUSES FOR THAT CODE OF A CHEVY ARE:
WEAK BATTERY
FAULTY COMPUTER OR ECM (Engine Control Module)
BLOWN ECM FUSE
ECM WIRE HARNESS IS OPEN OR SHORTED
ECM CIRCUIT HAS POOR ELECTRICAL CONNECTION.

Oct 28, 2014 | Cars & Trucks

1 Answer

1990 1500k 5.7 clear ecm timing code


On GM products built before 1996 you can disconnect the battery to clear trouble codes.

Feb 20, 2014 | 1990 Chevrolet K1500

1 Answer

Clear trouble codes on dash display


usually disconnecting the negitive terminal on the battery for 30 seconds or so ..downside is you will have to reset saved radio stations and clock .. if its a car like a dodge stratus or Concorde where you have to take one of the front wheels ( depending what side the battery is on ) off to get to the panel in the fenderwell that the battery is behind .. auto zone has a free thing where they connect a code reader to tell you the trouble code number.. but if you ask they may erase the codes so the lights will go out .. if not then disconnecting the negitive terminal is the other option

Feb 06, 2013 | 1999 Land Rover Discovery

1 Answer

Fault code p1406


Codes

Print
Stored fault codes may be erased from memory at any time by removing power from the VCM for at least 30 seconds. It may be necessary to clear stored codes during diagnosis to check for any recurrence during a test drive, but the stored codes must be written down when retrieved. The codes may still be required for subsequent troubleshooting. Whenever a repair is complete, the stored codes must be erased and the vehicle test driven to confirm correct operation and repair.

WARNING The ignition switch must be OFF any time power is disconnected or restored to the VCM. Severe damage may result if this precaution is not observed.
Depending on the electrical distribution of the particular vehicle, power to the VCM may be disconnected by removing the VCM fuse in the fusebox, disconnecting the in-line fuse holder near the positive battery terminal or disconnecting the VCM power lead at the battery terminal. Disconnecting the negative battery cable to clear codes is not recommended as this will also clear other memory data in the vehicle such as radio presets.
The following are the codes for the 1994-95 models with the OBD I and OBD II systems.
See Figure 1 through 6


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Fig. Fig. 1: DTC chart for 1994 ECM models


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Fig. Fig. 2: DTC chart for 1994 PCM models


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Fig. Fig. 3: DTC chart for 1994-95 VCM models


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Fig. Fig. 4: DTC chart for 1995 PCM models


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Fig. Fig. 5: DTC chart for 1995 VCM-A models


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May 27, 2012 | 1995 GMC Jimmy

1 Answer

I have a p1336 code. is it a bad sensor or a wire problem ?


This is from updated GM service manual of mine.


According to the GM factory service manual, the OBD-II trouble code, P1336, is defined as follows: DTC P1336 CKP System Variation Not Learned. The factory service manual does not enumerate all of the symptoms of this trouble code, but after consulting a professional custom PCM tuner, it was learned that aside from the annoying light on the instrument cluster, the other symptoms exhibited may include: poor vehicle performance, and loss of misfire detection diagnostics.


This DTC is particularly nasty, because simply clearing it by disconnecting the battery, or clearing it using an OBD-II scan tool will not address the problem. The code will be set again later unless the vehicle is run through the actual "crank relearn" procedure.


Fixing the Dreaded P1336 DTC


There is only one way to properly fix the P1336 DTC, and that's to perform a "crank relearn" procedure, or as the GM factory service manual procedure calls it, the CKP System Variation Learn Procedure. This procedure can be initiated and performed by GM's be-all end-all scan tool, the Tech-2. It can also be performed by some aftermarket scan tools. Furthermore, some of the PCM tuning software applications are capable of initiating a "crank relearn" procedure.

Jan 19, 2011 | Chevrolet S 10 Cars & Trucks

1 Answer

1994 Chevy Suburban Diesel 6 5 Turbo For Sale in San Diego $3450


the gm turbo diesel is a castrated 350 gas engine. dont buy it. nothing but trouble. better off with a ford older model. you will pay a little more but in long run be much happier

Oct 30, 2009 | GMC Suburban Cars & Trucks

1 Answer

What'z the flow of diagnostics for obdII code 1336 for GM(4.3 vortec)


According to the GM factory service manual, the OBD-II trouble code, P1336, is defined as follows: DTC P1336 CKP System Variation Not Learned. The factory service manual does not enumerate all of the symptoms of this trouble code, but after consulting a professional custom PCM tuner, it was learned that aside from the annoying light on the instrument cluster, the other symptoms exhibited may include: poor vehicle performance, and loss of misfire detection diagnostics.

This DTC is particularly nasty, because simply clearing it by disconnecting the battery, or clearing it using an OBD-II scan tool will not address the problem. The code will be set again later unless the vehicle is run through the actual “crank relearn” procedure.

There is only one way to properly fix the P1336 DTC, and that’s to perform a “crank relearn” procedure, or as the GM factory service manual procedure calls it, the CKP System Variation Learn Procedure. This procedure can be initiated and performed by GM’s be-all end-all scan tool, the Tech-2. It can also be performed by some aftermarket scan tools. Furthermore, some of the PCM tuning software applications are capable of initiating a “crank relearn” procedure.

For most enthusiasts that encounter this issue, the best course of action is to bring the vehicle to a local GM dealership and have them perform the procedure. Unfortunately most dealerships will charge a modest fee for doing this (upwards of USD $100 in some cases).

Oct 07, 2009 | 1999 GMC Jimmy

2 Answers

How do i clear the "service engine soon"


Disconnect the battery for a minuit and turn on the light's to power down any electrical power. Reconnect the battery and that should clear the "servie engine light soon",but if there are any DTC codes, the "Service engine light" will come back on.
On board diagnostic (OBD) was designed on vehicles equipped with electronic fuel injection so you can generally retrieve the codes yourself. No need buying a scanner or running to any parts stores to check the Engine Light. This system is called obd1 and applies to most vehicles made before 1995 for domestics and 1993 on imports.

For GM domestic vehicles made before 1995, the diagnostic connector is located under the dash panel by the driver side. To get the check engine codes to flash in your dash panel, use a jumper wire or a paper clip and connect terminals A and B of the diagnostic connector. Turn your ignition key on with engine off and the codes should start to blink. All codes should start with code 12 which is one long flash followed by 2 short flashes. This code 12 means the diagnostic system is normal and will repeat itself continuously if there are no trouble codes. Otherwise, code 12 will flash 3 times before flashing the fault codes.

the codes can be erased or cleared by disconnecting the battery negative terminal for 1 minute and reconnect. Just make sure to check your service manual in case you have electronic equipment such as radio or clock that needs reprogramming in which battery disconnection is not recommended. Finally after performing repairs on the culprit code, always go for a road test to confirm if the problem is fixed.

Good luck and hope this help, here is a link to the DTC codes. http://www.gmtuners.com/OBD1_DTC.htm

May 08, 2009 | 1989 GMC Sierra

2 Answers

Pcm trouble codes.


You can either use a auto scan tool to clear the code's, or you can unplug the battery negative cable, if you have a anti-theft system you may have problem's after disconnecting the battery?

Apr 21, 2009 | 2003 Jeep Wrangler

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