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Old 11-09-2013, 08:23 PM   #1 (permalink)
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Check Engine Light On, With No Codes

So I fired off the truck yesterday morning and the check engine light immediately came on. It was cooler than when I normally start it, probably in the 30's, but I let the grid heater warm things up prior to starting it. The truck ran fine and nothing seemed out of the ordinary other than the check engine light not going off. I've cycled the key several times to clear it like I had in the past, but its still on. Additionally, there's no error code. I just see a line go up and down in the odometer display, all the gauges move incrementally together, then when the cycle is done, there is no code and the check engine light stays on. Any ideas?



'99 QCLB, NV4500 Southbend Dual Disk, 5'' Turbo Back, BHAF, Edge Drag Comp, AD100, Fuel, Boost, Pyro gauges, 5.5'' Skyjacker Lift, 3rd Gen Wheels.
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Old 11-09-2013, 08:42 PM   #2 (permalink)
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Key trick is worthless, so don't rely on it. At any rate it was displaying it due to low voltage while the grid heaters were cycling right after a start.
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Old 11-09-2013, 09:00 PM   #3 (permalink)
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That makes a lot of sense, is there any way I can clear it without a tool or taking it to the dealer?



'99 QCLB, NV4500 Southbend Dual Disk, 5'' Turbo Back, BHAF, Edge Drag Comp, AD100, Fuel, Boost, Pyro gauges, 5.5'' Skyjacker Lift, 3rd Gen Wheels.
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Old 11-09-2013, 10:55 PM   #4 (permalink)
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That makes a lot of sense, is there any way I can clear it without a tool or taking it to the dealer?



'99 QCLB, NV4500 Southbend Dual Disk, 5'' Turbo Back, BHAF, Edge Drag Comp, AD100, Fuel, Boost, Pyro gauges, 5.5'' Skyjacker Lift, 3rd Gen Wheels.
Absolutely not. Must be cleared by a dealer or a code reader. Auoparts store may do this free of charge (sometimes) !! I'd buy a cheap scanner from harbor freight or any autoparts stores carry these.
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Old 11-10-2013, 09:45 PM   #5 (permalink)
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That makes a lot of sense, is there any way I can clear it without a tool or taking it to the dealer?



'99 QCLB, NV4500 Southbend Dual Disk, 5'' Turbo Back, BHAF, Edge Drag Comp, AD100, Fuel, Boost, Pyro gauges, 5.5'' Skyjacker Lift, 3rd Gen Wheels.
There is no error code... It's goal is to bring your attention to the instrument cluster. When you see that light you are supposed to scan all your gauges. That's when you would see the low voltage. Then you would see the voltage rise, and the warning go away.

You may want to check the health of your batteries though.
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Old 11-10-2013, 09:47 PM   #6 (permalink)
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You could always clear it by disconnecting the battery for 15 minutes.


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Old 11-10-2013, 09:48 PM   #7 (permalink)
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You could always clear it by disconnecting the battery for 15 minutes.


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Epic fail.
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Old 11-10-2013, 10:02 PM   #8 (permalink)
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You could always clear it by disconnecting the battery for 15 minutes.


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Absolutely NOT. You MUST use a scanner !!!
Unhooking the batteries for a week Ora month will not do anything but make you reset your clock !!!
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Old 11-10-2013, 10:10 PM   #9 (permalink)
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Let me reword my post. Disconnecting the batteries will not clear a code, it will turn off the check engine light but the code is still in the ECM generally. Since he has no code, disconnecting the battery should turn the CEL light off


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Old 11-11-2013, 03:31 AM   #10 (permalink)
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If you can find someone with a smarty that is unloaded from their truck you can use it to read your code and clear it
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Old 11-11-2013, 10:14 AM   #11 (permalink)
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Let me reword my post. Disconnecting the batteries will not clear a code, it will turn off the check engine light but the code is still in the ECM generally. Since he has no code, disconnecting the battery should turn the CEL light off


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And then you have to recalibrate the APPS
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Old 11-18-2013, 02:29 PM   #12 (permalink)
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I bought a code reader and saw the truck had thrown the overboost code (p0236) and the grid heater code. It still throws both codes on a pretty regular basis. Any ideas on an easy fix?







'99 QCLB, NV4500 Southbend Dual Disk, 5'' Turbo Back, BHAF, Edge Drag Comp, AD100, Fuel, Boost, Pyro gauges, 5.5'' Skyjacker Lift, 3rd Gen Wheels.
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