First time post.

Truck has less than 650 miles on it, and I have had the check engine light come on twice already. First time was two start ups after installing a new aftermarket locking fuel cap. Service dept. at dealer said that the aftermarket cap was the culpret. The sprial threads on the cap fit the filler neck fine, but it would not seal properly which tripped the light. I exchanged the cap with a Mopar locking cap, and the code was cleared. The check engine light lit up again yesterday two start ups after fueling up the tank. A three week interval between the first light. Haven't been to dealer yet to find out what why it tripped.
Only reason I can think of is that I topped off the tank all the way to the top of the filler neck with fuel. Has anyone experienced the check engine light coming on due to overfilling the tank?
Love the truck other than this hickup.

 

welcome to DTR Keith. Unfortunately you are going to the local dealer which i wont name. I am just across the water from you in the shipyard. here's the procedure for checking your codes. or you can drive up to the house and we can have a get together and look at it ourselves.

turn your key on and off 3 times, then back to on. watch your odometer, it will read the codes that set the light. they will be something like this
p0191.

it will always have the p, but the 4 digits will be different from the example. just write down what they are and post it here. then we shall see if their fuel cap theory is correct. once you post the results, i'll paste a link to the page with the code descriptions on them for future reference.

chris

 

Chris,
Thanks for fast reply. Will get back with the code# ASAP. Purchased truck from Tacoma Dodge, and have a good working relationship with service dept. there. Problem getting across the bridge is worse than service dept.

 

yeah i understand. better than dealing with brem dodge though. even if you like going to them, you are still welcome to come on up to the house for BBQ and truck time.

chris

 

What are the fault codes for my ODBII equipped vehicle?
Answer: P0016 Crankshaft/Camshaft Timing Misalignment/Out-of-Sync
P0071 Ambient Temperature Sensor Performance / Rationality
P0072 Ambient Temperature Sensor Low
P0073 Ambient Temperature Sensor High
P0088 Fuel Rail Pressure Too High
P0106 Manifold Absolute Pressure Sensor Performance / Rationality
P0107 Manifold Absolute Pressure Sensor Low
P0108 Manifold Absolute Pressure Sensor High
P0111 Intake Air / Charge Temperature Sensor Performance / Rationality
P0112 Intake Air / Charge Temperature Sensor Low
P0113 Intake Air / Charge Temperature Sensor High
P0116 Engine Coolant Temperature Sensor Performance / Rationality
P0117 Engine Coolant Temperature Sensor Low
P0118 Engine Coolant Temperature Sensor High
P0128 Cooling System Error / Thermostat Rationality
P0148 Fuel Delivery Error
P0169 Water-in-Fuel Detected For Too Long
P0192 Fuel Rail Pressure Sensor Low
P0193 Fuel Rail Pressure Sensor High
P0201 Fuel Injector 1 Circuit
P0202 Fuel Injector 2 Circuit
P0203 Fuel Injector 3 Circuit
P0204 Fuel Injector 4 Circuit
P0205 Fuel Injector 5 Circuit
P0206 Fuel Injector 6 Circuit
P0217 Coolant Temperature Too High
P0219 Engine Overspeed
P0234 Turbocharger Overboost Condition
P0236 Turbocharger Boost Pressure Sensor Performance / Rationality
P0237 Turbocharger Boost Pressure Sensor Low
P0238 Turbocharger Boost Pressure Sensor High
P0251 Injection Pump Fuel Valve Feedback
P0300 Multiple Cylinder Misfire
P0301 Cylinder 1 Misfire
P0302 Cylinder 2 Misfire
P0303 Cylinder 3 Misfire
P0304 Cylinder 4 Misfire
P0305 Cylinder 5 Misfire
P0306 Cylinder 6 Misfire
P0335 Crankshaft Position Sensor Circuit
P0336 Crankshaft Position Sensor Performance
P0337 Crankshaft Position Sensor Circuit Low
P0338 Crankshaft Position Sensor Circuit High
P0340 Camshaft Position Sensor Circuit
P0341 Camshaft Position Sensor Performance / Rationality
P0381 Wait-to-Start Lamp Inoperative
P0461 Fuel Level Sensor 1 Performance / Rationality
P0462 Fuel Level Sensor 1 Low
P0463 Fuel Level Sensor 1 High
P0477 Exhaust Pressure Control Relay Low
P0478 Exhaust Pressure Control Relay High
P0480 Cooling Fan 1 Control Circuit/Open (Low Speed Fan Relay)
P0483 Cooling Fan Speed
P0500 Vehicle Speed Sensor 1 Circuit, or No Vehicle Speed Reference Signal 1
P0514 Battery Temperature Sensor Performance / Rationality
P0516 Battery Temperature Sensor Low
P0517 Battery Temperature Sensor High
P0521 Oil Pressure Sensor Performance / Rationality
P0524 Oil Pressure Too Low
P0532 A/C Pressure Sensor Low
P0533 A/C Pressure Sensor High
P0541 Intake Air Heater Relay 1 Low
P0542 Intake Air Heater Relay 1 High
P0562 Battery Voltage Low
P0563 Battery Voltage High
P0572 Brake Switch 1 Low
P0573 Brake Switch 1 High
P0580 Speed Control Multiplexed Switch 1 Low
P0581 Speed Control Multiplexed Switch 1 High
P0602 Control Module Programming Error/NotProgrammed
P0604 Internal Control Module RAM Integrity Failure
P0606 Internal ECM Processor
P0607 ECU Internal Performance
P0622 Generator Field Control Circuit
P0628 Fuel Pump Relay Circuit Low, or Fuel Lift Pump Control Circuit Low
P0629 Fuel Pump Relay Circuit High, or Fuel Lift Pump Control Circuit High
P0630 VIN Not Programmed in PCM
P0633 SKIM Key Not Programmed in PCM
P0642 Sensor Reference Voltage 1 Circuit Low
P0643 Sensor Reference Voltage 1 Circuit High
P0646 A/C Clutch Relay Circuit Low
P0647 A/C Clutch Relay Circuit High
P0652 Sensor Reference Voltage 2 Circuit Low
P0653 Sensor Reference Voltage 2 Circuit High
P0698 Sensor Reference Voltage 3 Circuit Low
P0699 Sensor Reference Voltage 3 Circuit High
P0700 Transmission Control System (MIL Request)
P0837 Four Wheel Drive (4WD) Switch Performance / Rationality
P0838 Four Wheel Drive (4WD) Switch Circuit Low
P0839 Four Wheel Drive (4WD) Switch Circuit High
P1652 J1850 Communication Bus
P2121 Pedal Position Sensor 1 Performance / Rationality
P2122 Pedal Position Sensor 1 Low
P2123 Pedal Position Sensor 1 High
P2127 Pedal Validation Switch 2 Low
P2128 Pedal Validation Switch 2 High
P2146 Fuel Injector Group 1 Supply Voltage Circuit
P2149 Fuel Injector Group 2 Supply Voltage Circuit
P2266 Water in Fuel Sensor Circuit Low
P2269 Water in Fuel Condition
P2502 Charging System Output Voltage
P2503 Charging System Output Low
P2504 Charging System Output High
P2509 ECM/PCM Power Input Signal Intermittent
P2607 Intake Air Heater Relay 2 Low
P2608 Intake Air Heater Relay 2 High
P2609 Intake Air Heater System Performance

 

To answer your question about "overfilling" the tank, no, I don't think that's the culprit. Unless, of course, your truck, whatever the year, and my '04 are different. I have Dave Kelly's vent kit on my truck and regularly fill it until fuel is standing in the neck. On my '04, the kit adds three or four gallons of useable capacity. Once I actually put 37.2 gallons in my 34 gallon tank. That was at a Flyin' J in Rapid City, SD.

 

I don't believe your CEL has anything to do with the fuel cap. As far as I know, the 3rd Gen diesels don't use a vapor recovery system for the fuel tank, so it's not the emissions control that is causing the CEL to come on. I've never had any CEL issues with either the OEM fuel cap, or the Mopar locking cap that I replaced it with about three years ago. Regardless of how much fuel is in the tank, or which cap you use, there are two barbs on top of the tank which should be connected to vent tubes and be open to the atmosphere. Even if you fill to the neck, the vents should release any vacuum in the tank as the engine consumes fuel.

As tomm posted, do the key trick to read any codes from the odometer. Hopefully that will give you a more precise area to focus on!

 

Hmmmm, I never realized that there was a way to read the pcodes using the key/odometer. However, of possible interest, I purchased my truck in April and since taking possession I began to experience check engine lights that would eventully clear on their own. In Oct while on a trip towing my 5vr the check engine light came on but never cleared. I took it into my dealer, who checked and told me it was, as I recall, a p191 or something very close but I may be mistaken. In any case they said that there was a service advisory to resolve the issue via a ECM reflash. Since the reflash I have not received any check engine lights.

 

Thanks tomm for that list of codes! I just printed it out to keep in my truck if I ever need them.

 

Good idea! I just did the same thing.

 

Thanks Gents for the info.

Keith Willard
Port Orchard