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1998 Dodge Dakota Base Reg Cab 112 WB Sport

1998 Dodge Dakota
Trim Info:
Rear Wheel Drive, Reg Cab 6.5'
20 mpg city / 25 mpg hwy
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May 6, 2012, 8:33 am

Robert D

Question: Codes P0700,P0987,P0499,P0498

I have a 2003 Dodge Dakota 4.7l engine that has the above codes. I have already replaced the natural vacuum canister vent solenoid and purge valve solenoid, changed the sensor on the transmission ,replaced the battery, replaced the gas cap, changed the transmission fluid and filter and changed coil on cylinder #7 twice. Got rid of the 0987 & 0700 code after this work but have never been able to get rid of 0498 & 0499. It was running good at first but now is cutting out, doesn't want to start from stops. I have checked all the fuses and have found nothing. Would it help to replace or clean the other two sensors in the transmission or where should I go from here. Any advice would be helpful.

May 14, 2012, 4:39 pm

Ron W
Expert Mechanic

P0499 Evaporative Emission System Vent Valve Control Circuit High
P0498 Evaporative Emission System Vent Valve Control Circuit Low

It is odd to have both of these codes at the same time. I would suspect a wiring issue in this circuit. I know you said you replaced the vent solenoid, you should recheck the connector to make sure it doesn't have corrosion in it as that could cause this type of issue.

One other thing I would say is have your charging system tested for an AC voltage leak. With multiple codes set (especially unstable voltage codes) there is a good change the battery or charging system may have an issue. The computers rely on stable voltage and if it isn't there, they can set all sorts of odd codes.

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