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Where is the ECm fuse - 2005 Buick LaCrosse

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Under the hood, standing in front of the vehicle look on the right wheel well the fuse box will have a black lid on it. But a little advise be careful pulling out fuses as you should disconnect the battery cable first. So you wont fry the fuse.

Posted on Nov 28, 2013

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Posted on Jan 02, 2017

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My 2013 dodge avenger wont start. Im getting a p0688 ECM/PCM code. What should I do


P0688 (generic) = ECM/PCM Power Relay Sense Circuit /Open
P0688 DODGE - Auto Shutdown Relay Control Circuit Low

Check all the ECM fuses, if the fuses are OK try replacing the ASD (Auto Shut Down) relay.

Read more: http://www.autocodes.com/p0688_dodge.html#ixzz405J7vpq8

Possible causes:

- Weak battery - Low voltage while cranking
- Faulty Engine Control Module (ECM) relay
- Blown ECM fuse
- Faulty ECM
- ECM harness is open or shorted
- ECM circuit poor electrical connection

Feb 13, 2016 | Dodge Cars & Trucks

1 Answer

Ecm fuse blows how to find cause?


it might be your ecm could be internal ,find out if there is anything else on that ecm fuse if its just the ecm ,you will need a ecm,check your wiring from fuse box to the ecm if the wiring is good then you should know what to replace

Mar 01, 2014 | Nissan Altima Cars & Trucks

1 Answer

ECM fuse keeps popping and fuel system don't work


There should be two ECM fuses. Number one powers the injectors and some of the solenoids along with the ECM. Number two or B powers the fuel pump relay and the rest of the ECM including the sensors that provide data to the ECM. Both are 10amp circuits.
You may need to get a shop manual to have the wiring diagrams to troubleshoot the circuits.

Sep 20, 2012 | 1988 GMC S-15

1 Answer

I replaced the fuel pump relay, noticed that i had a blown fuse marked ecm. repaced that.ran truck for around 20 min.turned off. when i went to start again it wouldnt. looked at that same 20 amp fuse


There are two ECM fuses - marked ecm 1 and ecm B.
ECM B powers the fuel pump and the Veh control module which handles most of the sensors.
ECM 1 powers the ignition module, coil, injectors and the rest of the engine sensors.
You may need a repair book with diagrams to check all of the circuits for shorts.

Jul 30, 2012 | 1999 GMC Sierra 3500

1 Answer

I have a 1992 buick roadmaster..and after driving my car for a while,the fuse to the ecm blows..what could be the problem?


Early 90's GMs have had more than thier share of electrical problems. the problem with your Buick is not unheard of. The most common cause of the ECM fuse blowing is a short to ground in one of the ECM sensor circuits. So check all of the engine sensor connections and the sensors. Pay particular attention to wiring underneath the car. Could be the ECM is faulty, but fairly uncommon for this to be the case.

Jul 02, 2012 | 1992 Buick Roadmaster

1 Answer

Trying to locate the ecm fuse to replace. cant find any diagrams for this or anything on it


the ecm fuse is in the fuse panel and is marked ecm on the fuse panel below the fuse.the fuse panel is under the dash on the drivers side,just use a test light with the key on and check all the fuses remembering the headlight/tail lights must be on and some other circuits need to be turned on.you don`t say why you are looking for the ecm fuse or the year make and model of car.

Mar 24, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

What does the code p1166 mean on my 2003 rsx type s


DTC P1166: A/F Sensor (Sensor 1) Heater Circuit Malfunction


  1. Reset the ECM/PCM.
  2. Start the engine.
Is DTC P1166 indicated?

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C101 (located under the right side of the dash), C401 (located under the left side of the dash), C402 (located under under the left side of the dash) the A/F Sensor relay, the A/F Sensor (Sensor 1) and the ECM/PCM.


  1. Check the following fuse:
    • No.14 OPTION (30A) fuse in under-hood fuse/relay box.
    • No.2+B LAF HEATER (20A) fuse in under-dash fuse/relay box.
    • No. 4ACG (10A) in under-dash fuse/relay box.
Are any of the fuses blown?

YES - Repair short in the wire between the A/F Sensor relay and the fuses.

NO - Go to step 4.

94729647

  1. Measure voltage between ECM/PCM connector terminals A1 and A24, 30 seconds after the ignition switch is turned ON (II).
Is there battery voltage?

YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.

NO - Go to step 5.

94729648

  1. Measure voltage between ECM/PCM connector terminals A22 and A24.
Is there battery voltage?

YES - Go to step 6.

NO - Go to step 10.


  1. Turn the ignition switch OFF.
  2. Disconnect ECM/PCM connector E (31P).
  3. Turn the ignition switch ON (II).
94729649

  1. Connect ECM/PCM connector terminal E8 to body ground with a jumper wire, then measure voltage between ECM/PCM connector terminals A1 and A24.
Is there battery voltage?

YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.

NO - Repair open or short in the wire between the A/F Sensor (Sensor 1) and ECM/PCM (A1).


  1. Turn the ignition switch OFF.
  2. Disconnect the ECM/PCM connector A (31P) and the A/F Sensor (Sensor 1) 4P connector.
94729650

  1. Check for continuity between the A/F Sensor (Sensor 1) 4P connector terminal No.3 and body ground.
Is there continuity?

YES - Repair short in the wire between the A/F Sensor relay, A/F Sensor (Sensor 1) and ECM/PCM (A22).

NO - Go to step 13.


  1. Turn the ignition switch ON (II).
94729651

  1. Measure voltage between ECM/PCM connector terminals E8 and A24.
Is there battery voltage?

YES - Repair open in the wire between the ECM/PCM (A22) and the A/F Sensor (Sensor 1).

NO - Go to step 15.


  1. Check for continuity in the wires between the A/F Sensor and the fuses.
Is there continuity?

YES - The wires are OK. Replace the A/F Sensor relay.

NO Repair open in the wire between the A/F Sensor relay and the fuses.

Mar 17, 2011 | Acura RSX Cars & Trucks

1 Answer

I have a 1990 Chevrolet C2500 Pickup. It keeps blowing the ECM fuse. Its not the ecm, its not the fuel pump, its not the fruel pump relay. What else could blow the ECM fuse?. There is no visual evidence of...


if it is the ecm b fuse thats blowing i would try disconnecting your oil sending unit and see if it still blows the fuse.i have seen the sending unit short out internally before and blow the fuse.if it is the ecm 1 fuse it is either a chaffed wire or one of your injectors shorted.

Feb 09, 2011 | 1989 Chevrolet C2500

1 Answer

Blown ecm fuse


unhook the ecm and check if the fuse does not blow,you will know if it is the ecm,Hope this helps

Sep 06, 2009 | 1988 Chevrolet S-10

1 Answer

Keep blowing ECM fuse on 90 honda accord


I'm thinking the ECM is bad and grounding out, causing the car to blow the fuse. The old gas wouldn't cause this problem.

May 27, 2009 | 1990 Honda Accord

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