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Ground wire codes engine light on - 2003 Chrysler 300M

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All these codes are related to the O2 sensor... the most common issue is when putting the cover on you trap the wire under the valve cover causing the wires to ground to the engine. Check the routing of the O2 sensor wires

Jun 12, 2017 | BMW Cars & Trucks

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Has spark no injector pulse has power to the injectors

No pulse means the injector ground side is absent, since you have power to the injectors. The ground wire goes into the engine computer to be internally grounded for the pulse. You can test the injector ground side with a test light, as a verification of it not having pulse. If it really has no pulse, but it has correct voltage to the injector solenoid, then you have a bad injector, or a bad ground wire to the pcm, or a bad pcm.

Use a test light with a ground clip and a needle-type probe. Unplug the injector connector and note which is the power wire terminal and which is the ground wire terminal. Clip the test light lead to the POSITIVE battery post, and put the probe into the injector's ground wire terminal. Now have someone crank the engine over and watch for a blinking light on the tester. If you have a blinking light, the injector ground side is working right, so check if voltage to the injector is correct, or if you have a bad injector. If you have no blinking light, then no pulse is correct. You will need to check the ground wire to the computer before assuming a bad computer. I think they are called quad drivers inside the computer that control the injector grounds.

Best way to check that ground wire is, first, take off the negative battery cable, then pull off the computer connectors, then use an ohmmeter to check resistance of wire from injector terminal to the pin on the computer's connector. Low resistance, low ohms, means the wire is good. ...But first I guess you will have to find the pin-out diagram for the computer, where and on which connector that ground wire goes in at. There's around a hundred or more wires going in, so color coding, tracing by the color of the wire would be a royal pain. Good luck, Scott.

May 07, 2015 | Cars & Trucks

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Trouble codes p0118 temperature po118

code p0118 refers to engine coolant temperature (ETC) sensor ---circuit malfunction===causes---coolant thermostat---wiring open circuit/short to positive---wiring short to ground---ground wire defective---ECT sensor.. The temp gauge works off a temperature sender unit separate to the coolant sensor and if it is reading 100 then it indicates an overheat situation in the engine . Probably why the engine light is coming on. As the thermostat is in the list of causes I would replace it as a precaution. The coolant sensor is what tells the CPU to turn on the electric fans to cool the radiator

Jan 13, 2014 | 2004 GMC Envoy

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Because I have a bad ground wire on my 1996 mercury cougar xr7 V8. Autozone can't scan the computer to see why the check engine light is on. But they told me if I got on line I could find out what pins or...

ground wire ? well that tell you about that autozone... are you lights working ? is the engine run ? then you have a ground wire. if you have a bad ground wire it will cause you lots of problems for one it will just cut out with no lights etc. or flickering lights. easy to fix a ground wire. replace the earth wire from the battery to the shell of the engine bay. 5 min job. now to your problem is it auto or manual auto if it has this problem with 2 to 3 gear its a sticking solenoid in the auto box... it will need replacing. manual it would be the gear gate warn out and will need replacing. also on a auto you will need to check the speed sensor as this tells the auto box to change gear if it is missing a reading it will be sluggish.

Nov 29, 2013 | Cars & Trucks

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Check engine light comes on but there are no diag codes


Apr 18, 2011 | 2000 Hyundai Elantra

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The car will not start at all but my lights work but not the radio..tried to get a jump but that didn't work

The Sebring is notorious for no starts. First, check all of your fuses. You want to make sure your engine is getting gas. Make sure your fuel pump is kicking on. It could be a problem in the coils and wires. The best way to tell is getting a code. if your check engine light is on of course. This would narrow your search. Check all your wires and make sure all ground wires are grounded. All grounds are black wires. Hope this helps you some.

Feb 05, 2011 | 2001 Chrysler Sebring

2 Answers

03 grand caravan ex 3.8. check engine light - code po456/evap sys small leek. tried new fuel cap, light still on. What hoses can I look for to find a leak?? or could it still be fuel cap and sensor needs...

Customer Concern: MIL on and code P0456 for a leak in the evaporative system. How to test the Leak Detection Pump (LDP). Tests/Procedures: 1. With the engine running, connect a test light to the Violet/White wire at the LDP. The test light should light.

2. Ground the center wire at the LDP. The test light should go out. This is the intake stroke of the pump. The LDP pulls in fresh air when the center wire is grounded with a vacuum supply to the LDP.

3. Remove the ground from the center wire and the test light should light up again. The pump has just pumped air into the evaporative system. The test light lights up when the diaphragm is in the down position.

4. To test the LDP for leaks, cap off the port that goes to the canister or to the vent valve. This is the port that is slightly above the bottom port that goes to the vent filter.

5. Now try to cycle the LDP again by grounding the center wire. The test light will still go out but now when the ground is removed from the center wire, the test light should remain out for at least 20 seconds if the LDP is good. Potential Causes: Leak Detection Pump (LDP)
Vent Valve

Oct 16, 2009 | 2002 Dodge Grand Caravan

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Check Engine Light with Code P0072 on 2004 Volvo XC90

Grounding issue "Circuit low" = ground wire problem or another system on the same circuit using too much current.

Check all wiring issues and then correct the issue to have the code go away :)

Apr 03, 2009 | 2004 Volvo XC90

2 Answers

Battery light flashes

Sounds like part of a wiring harness is shorting to ground or breaking a ground connection. Check engine to frame ground straps and engine compartment wiring. Look for loose or broken leads esp. alternator and battery wires. Perhaps the power lead to the computer is faulty causing the truck to misfire. Any engine codes?

Jun 11, 2008 | 2003 Mazda Tribute

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