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Dodge ram 3500: automatic..Check engine light comes on when I..freeway

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"99 Dodge ram 3500 ,diesel...
"99 Dodge ram 3500 ,diesel ,automatic. Check engine light comes on when I accellerate onto the freeway. It doesn't set a code. Until today I could reset the light with the key. Air & fuel filters have been changed. tps was changed last year.
Submitted: 8 years ago.Category: Dodge
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Answered in 1 hour by:
3/14/2009
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 8 years ago
sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 23,511
Experience: ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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Hello and welcome to JustAnswer!

 

Any time the check engine light comes on it will set a code, that's what turns the light on. The only way for the codes to go away is to clear them with a scan tool or code reader, disconnect the battery, or disconnect the engine controller connectors. I'm thinking there has to be a code set in there, or you've got multiple problems happening at the same time. How did you check for codes?

 

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Customer reply replied 8 years ago
I check codes using the key. On,off,on, off ,on. All that does is reset the light
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 8 years ago

Ok. Your truck has a unique controller set up. The key cycle method will let you read codes from the engine controller on a gas truck, but not Cummins. The Cummins trucks had two controllers. They had the Chrysler JTEC controller that controlled trans, a/c, cruise control, and charging functions. This is the same kind of controller as the gas trucks had. The engine itself is controlled by the Cummins engine controller, mounted on the left side of the engine block. This only communicates with the JTEC, and the JTEC with the rest of the modules on the truck. Cycling the key won't let you read codes stored in the Cummins controller on these. For working here on JA, I really wish you could read them this way.

 

The only way to get the codes that are turning your engine light on is with a code reader or professional scan tool. Almost all parts stores will check codes for free with a code reader now. If you could run by a parts store and have them read codes and let me know what they find I'll be able to tell you what to do to fix it.

 

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Customer reply replied 8 years ago
Ok I'll get back to you. Also the engine is nowbecoming hard to start
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 8 years ago

The two problems may very well go together. I'll be here all weekend, just let me know what you find out!

 

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Customer reply replied 8 years ago
<p>This isCustomer</p><p>I checked the codes I get P0336 crank position sensor circuit</p>
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 8 years ago
Excellent. Your hard start and engine light ARE the same problem! You've got a problem with the crank sensor or wiring. The crank sensor runs off a tone wheel on the crankshaft. The sensor mounts to the block and reads the wheel, the sensor is mounted right behind the starter. You have to pull the starter to get it out, but the starter comes out easy. (the bolts are 10mm 12 point) Look over the wiring to the sensor, and if its ok replace it. Crank sensors aren't uncommon on these trucks.
sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
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