2003 Dodge Ram P0837 codes won't go away - Dodge Cummins Diesel Forum
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post #1 of 19 (permalink) Old 12-04-2019, 09:50 PM Thread Starter
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2003 Dodge Ram P0837 codes won't go away

Good evening everyone,


I have a 2003 Dodge Ram 2500 with the Cummins 5.9L Diesel Engine. Recently I gotten the P0837, P0341, and P0366 codes popping up on the truck. I replaced both the camshaft and crankshaft sensors as well as the plug connectors and inspected the wiring. I start driving and the truck jerks(shakes) a little and the check engine light turns on. Sometimes the truck with continue to jerk and sometimes it runs fine. If it runs fine for 30-40 miles and I shut the truck off, next time I turn it on the light is gone. It has been doing this for a month and Im getting to the point that i don't know what else to do to it. I love my truck but this is starting to get old. Any recommendations?? Thanks in advance.

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post #2 of 19 (permalink) Old 12-04-2019, 11:12 PM
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i don't know what the issue is, but i would go through and verify ALL grounds and clean and tight, checking electrical connections for corrosion, broken pins, loose wires. you can even check the plugs under the TIPM. if the fan clutch wires are broken/chafed, that can cause some issues. i don't know if it would cause your symptoms, but it wouldn't hurt to check the wires.
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post #3 of 19 (permalink) Old 12-05-2019, 12:03 AM
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Be sure to also check the wiring harness under the oil filter/AC area for chafed/bare wires.
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post #4 of 19 (permalink) Old 12-05-2019, 08:17 AM
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Just because new sensor does not always mean good, We always use Cummins OEM replacement.
cam and crank sensors should be between 900-1100 ohms when properly tested.
Wiring on ECM needs to be clean tight some 03 had issue with this.
Should test with ohm meter can be issue internally in wiring/connectors
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post #5 of 19 (permalink) Old 12-08-2019, 10:32 PM Thread Starter
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Ok thank you I will look more closely at the wiring. I always use Cummins OEM parts especially if its electrical. Just sucks not being able to find the problem. Is there a way to buy a new engine harness? Im never getting rid of this truck so its worth the investment lol
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post #6 of 19 (permalink) Old 12-09-2019, 08:59 AM
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Might find NOS from some dealer or cummins.
Can search online at cummins parts website with ESN for proper harness. https://parts.cummins.com/
Try contact Painless Wiring might be able to make one for you.
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post #7 of 19 (permalink) Old 12-09-2019, 10:39 PM
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No TIPM in these trucks...

Unplug and clean connectors on ECM. Use the electrical contact cleaner in a spray can.

I also found issues on my 2004 with the two grey and purple connectors on the firewall behind the intake manifold. The contacts get corroded and loose nowadays from the engine vibrations and humidity. Those two connectors caused all sorts of issues with my gear indicator and speedometer...

Worse comes to worse, it could be the ECM, but it is always best to rule out all wiring first. Remember to check those grounds and also don't throw money at it, you'll regret it in the end.
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post #8 of 19 (permalink) Old 12-26-2019, 10:11 AM Thread Starter
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Thank you guys for the tips. I will check on it and let you know what I find. I been super busy and haven't had a chance to check the wiring. Also, I noticed that when I tow a trailer it jerks/shakes and activates the code more often. I have left the truck parked on idle for minutes just to see what id does and nothing. Only when driving. Thank you everyone once again for the tips.
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post #9 of 19 (permalink) Old 12-26-2019, 10:41 AM
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If more pronounced when towing and P0341 code

With the DRBIII, read DTCs.
Do you have a DTC for P2146 or P2149?

Yes ! Repair injector DTCs first.
Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
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post #10 of 19 (permalink) Old 01-18-2020, 07:16 PM Thread Starter
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No I don't have that. I have tried everything and they still come on every now and then. Earlier today i was driving back home from the fire station and it jerked a few times and wanted to shut off so I pulled over and I turned it off. It gave me 5 codes, P0483, P0837, P0336, P0341, P0647. It took a few times tries to turn it on. I would start it and it would sound rough and shut off, it even smelled like unburned fuel, I tried and tried and about the 6-7 time it started right up like nothing and ran fine for 50 miles or so. This truck is killing me lol. Any other suggestions before i take it to the dealer or burn it lol
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post #11 of 19 (permalink) Old 01-18-2020, 09:09 PM
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Any multiple codes like that, I would first check make sure good batteries 12.6 v++ fully charged and good connections including grounds, to batteries and PDC.

Then like mentioned, with those codes and info provided most common cause is wires by ac compressor, ECM shares ac clutch/transducer sensors signal/power feeds with other sensors.

P0837 probably unrelated should go thru diagnostics
P0837-4WD MUX SWITCH PERFORMANCE
When Monitored and Set Condition:
P0837-4WD MUX SWITCH PERFORMANCE
When Monitored: Continuously with the ignition on.
Set Condition: The 4WD muxed switch input detected in an invalid range or irrational
switch state.
POSSIBLE CAUSES
RELATED DTCS PRESENT
TRANSFER CASE SHIFTER OUT OF ADJUSTMENT
TRANSFER CASE POSITION SENSOR OUT OF TOLERANCE
POWERTRAIN/ENGINE CONTROL MODULE
TEST ACTION APPLICABILITY
1 With the DRBIIIt, read DTCs.
Are any other Transfer Case DTCs present?
Yes ! Repair all other Transfer Case DTCs before proceeding.
No ! Go To 2
2 Verify proper Transfer Case Shifter adjustment per the Service Information.
Is the Transfer Case Shifter adjusted correctly?
All
Yes ! Go To 3
No ! Adjust the Transfer Case shifter linkage per the Service Information.
3 Turn the ignition off to the lock position.
Disconnect the PCM/ECM harness connector(s).

Measure the resistance across the Transfer Case Position Sensor signal circuit and
Sensor Ground circuit at the PCM/ECM harness connector.
Place the transfer case in each of the following positions:
2H - resistance should be between 1124 and 1243 ohms.
4H - resistance should be between 650 and 719 ohms.
N - resistance should be between 389 and 431 ohms.
4L - resistance should be between 199 and 221 ohms.
Were all resistance values in each transfer case position within the specified range?
All
Yes ! Go To 4
No ! Replace the Transfer Case Position Sensor.
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post #12 of 19 (permalink) Old Yesterday, 01:51 PM Thread Starter
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Good morning, so I took the truck to a friends shop and he hooked it up to his computer and tried to erase the codes but they came right back. The camshaft and crankshaft sensors are working and communications properly. The fan clutch is working and has the right speed and voltage to it. He did however said that the lift pump pressure is low at around 2600-2800 and when started it goes up to around 5000 or so. He did mention that he doesn't hear the pump prime when you turn the key to "on" position before cranking the engine. Any suggestions???
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