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Ask Chad Farhat Your Own Question
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Dodge
Satisfied Customers: 3831
Experience:  Owner at Carolina Auto Service &Sales , 20 years Experience in Foreign & Domestic vehicles
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My truck started up, ran fine this morning short trip to

Customer Question

Hi. My truck started up , ran fine this morning for a short trip to town (about 8 miles). Got back home to grab something, went back to truck and now it shifted very hard into D, then when trying to pull up the small hill at end of driveway had no power to go. Pulled codes po725, po320, and po340. I replaced the Cam position sensor not more than 4 months ago.???
JA: Have you checked the spark plugs? When was your air filter last changed?
Customer: Just changed plugs last week, air filter looks good too.
JA: What is the model/year of your Dodge?
Customer: 2003 Ram 1500 3.7 V6
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes, checked transmission fluid, changed plugs because truck was frequently stalling, I had a smell of sulfer/rotten eggs coming out after a stall and restart, so I drilled out the catalytic converter to see if it being clogged may be causing the stalls, runs better than it had been and no longer won't start back up for long periods.
JA: Anything else you think the mechanic should know?
Customer: Truck stalls, (lots of times after fuel fill-up), runs very weak, has fuel odor after stall/restart, ac stopped blowing well when all this started too, still works but barely has any force coming from vents. Keep getting "lamp out" light on cluster.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Dodge Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Dodge
Expert:  Chad Farhat replied 1 year ago.

Hi, I' m Chad. Welcome to JustAnswer. I' m reviewing your question now, and I will be post back with your reply ASAP

Customer: replied 1 year ago.
Expert:  Chad Farhat replied 1 year ago.

1-You need to replace the ckp sensor if never replaced and but if replaced recently check the wiring and connector for intermittent signal

SYMPTOM P0320-NO CRANK REFERENCE SIGNAL AT PCM WHEN MONITORED With the ignition on. SET CONDITION No signal from the Crankshaft Position Sensor is present during engine cranking, and at least 3 Camshaft Position Sensor signals have occurred. POSSIBLE CAUSES - Cam position sensor signal - Intermittent crank position signal - (K7) 5 volt supply circuit shorted to voltage - (K7) 5 volt supply circuit open - (K7) 5 volt supply circuit shorted to ground - (K24) CKP sensor signal circuit shorted to voltage - (K24) CKP sensor signal circuit open - (K24) CKP sensor signal circuit shorted to ground - (K24) CKP sensor signal shorted to (K7) 5 volt supply circuit - (K4) sensor ground circuit open - Crankshaft position sensor - PCM

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2- The P0340 could be caused by the P0320, ( it a colleratla fault caused by the P03200

SYMPTOM P0340-NO CAM REFERENCE SIGNAL AT PCM WHEN MONITORED Engine cranking/running. SET CONDITION At least 5 seconds have elapsed with Crankshaft Position Sensor signals present but no Camshaft Position Sensor signal. POSSIBLE CAUSES - Checking intermittent CMP signal with lab scope - Crank Position Sensor signal - (K7) 5 volt supply circuit shorted to voltage - (K7) 5 volt supply circuit open - (K7) 5 volt supply circuit shorted to ground - (K44) CMP sensor signal circuit shorted to voltage - (K44) CMP sensor signal circuit open - (K44) CMP sensor signal circuit shorted ground - (K44) CMP sensor signal shorted to (K7) 5 volt supply circuit - (K4) sensor ground circuit open - Camshaft Position Sensor - PCM

3- The P0725 ( that usually a bad Transmission Input Speed Sensor going bad, and that will cause the hard shifting you are experiencing

I think you have 2 problems , Engine codes( P0320,P0340) & Transmission code (P0725)

Problem area based on these faults codes

1- the Crankshaft position sensor

2- The Transmission input speed sensor

If these 2 parts checks out and the wiring checks out , then you look for a defective PCM (computer not sending correct Ground )

SYMPTOM P0725-ENGINE SPEED SENSOR CIRCUIT WHEN MONITORED Continuously with engine running. SET CONDITION This code is set when the engine speed sensed by the Transmission is less than 400 RPM and the engine is running (As reported by the PCM over the communication bus) for 2 seconds. This DTC can take up to five minutes of problem identification before illuminating the MIL. POSSIBLE CAUSES - Related engine DTC's present - Powertrain control module - Intermittent wiring and connectors

Hope I was helpfull to you , Please let me know if you need anything else on it

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ASE Certified Technician