Engine codes

[DodgeLady]

My 1997 5.9L is in the shop. Started driving really bad- going along not too bad then ... really bad.
Codes are: P1602, P0622, P1391.

I hope it’s something they can fix.[emoji22]


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[Okiespaniel]

97 Ram should have a 2 number code....

http://dodgeram.info/Engine-Gas/OBDI/pcm_fault_code.htm

Newer codes...

https://www.allpar.com/fix/computer-codes.html

 

[DodgeLady]

97 Ram should have a 2 number code....

http://dodgeram.info/Engine-Gas/OBDI/pcm_fault_code.htm

Newer codes...

https://www.allpar.com/fix/computer-codes.html

Wow. This is interesting- I wonder where they got the codes (Pxxxx) that they gave to me?
Thanks!


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[MADDOG]

A stored code P0622 means that the powertrain control module (PCM) has detected a malfunction with the generator field coil control circuit. ... The PCM monitors the continuity and voltage level of the generator field control circuit whenever the engine is running. If you look at your alternator you'll see the field coil windings inside the case through the cooling vents.

OBD II fault code P1602 is caused by the Engine control module (ECM) detecting that the supply voltage is low from the battery”, or sometimes as “Power Supply (B+) Terminal 30 Low Voltage”, and is set when the PCM (Powertrain Control Module) detects that the battery current being supplied to the PCM when the ignition is switched off, is below a minimum allowable threshold.

A code P1391 indicates that your camshaft position sensor is sending erratic signals to the Powertrain Control Module (PCM). Given your other electrical issues I suspect that your crank position sensor harness or connector is corroded, dirty or possibly shorting out.

It may be causing a parasitic draw on your battery and it also appears that your alternator may not be charging your battery sufficiently.

It can all be fixed as a good tech will find any parasitic draw, fix that then move on to the other two issues.

 

[DodgeLady]

A stored code P0622 means that the powertrain control module (PCM) has detected a malfunction with the generator field coil control circuit. ... The PCM monitors the continuity and voltage level of the generator field control circuit whenever the engine is running. If you look at your alternator you'll see the field coil windings inside the case through the cooling vents.

OBD II fault code P1602 is caused by the Engine control module (ECM) detecting that the supply voltage is low from the battery”, or sometimes as “Power Supply (B+) Terminal 30 Low Voltage”, and is set when the PCM (Powertrain Control Module) detects that the battery current being supplied to the PCM when the ignition is switched off, is below a minimum allowable threshold.

A code P1391 indicates that your camshaft position sensor is sending erratic signals to the Powertrain Control Module (PCM). Given your other electrical issues I suspect that your crank position sensor harness or connector is corroded, dirty or possibly shorting out.

It may be causing a parasitic draw on your battery and it also appears that your alternator may not be charging your battery sufficiently.

It can all be fixed as a good tech will find any parasitic draw, fix that then move on to the other two issues.

Thanks Maddog for the detailed breakdown - and the encouragement that it can be fixed.
I think I have it at a good shop so here’s hoping...


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[EvilSpirit]

Wow. This is interesting- I wonder where they got the codes (Pxxxx) that they gave to me?
Thanks!


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They got the codes from your truck. Dodge went to OBD2 in the Rams in 1996 - I know my 1996 5.9 Ram is OBD2. It shows the typical "4 digit" codes.

 

[DodgeLady]

They got the codes from your truck. Dodge went to OBD2 in the Rams in 1996 - I know my 1996 5.9 Ram is OBD2. It shows the typical "4 digit" codes.

Thanks ES!


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[Fast69Mopar]

All vehicles manufactured for the USA built on or after 1996 are required to be OBDII compliant. The DTC's associated with PCM's or ECM's with OBDII vehicles will be P-Codes in the PXXX fashion.

Now, are you sure one of the DTC's they gave you was P1602? One of the earlier post stated that P1602 was low voltage detected at the PCM. I dont think this is correct.

P1602 PCM Not Programmed. This may have been a stored code. Was the truck recently worked on by another shop? Did you have the PCM replaced?

 

[DodgeLady]

A stored code P0622 means that the powertrain control module (PCM) has detected a malfunction with the generator field coil control circuit. ... The PCM monitors the continuity and voltage level of the generator field control circuit whenever the engine is running. If you look at your alternator you'll see the field coil windings inside the case through the cooling vents.

OBD II fault code P1602 is caused by the Engine control module (ECM) detecting that the supply voltage is low from the battery”, or sometimes as “Power Supply (B+) Terminal 30 Low Voltage”, and is set when the PCM (Powertrain Control Module) detects that the battery current being supplied to the PCM when the ignition is switched off, is below a minimum allowable threshold.

A code P1391 indicates that your camshaft position sensor is sending erratic signals to the Powertrain Control Module (PCM). Given your other electrical issues I suspect that your crank position sensor harness or connector is corroded, dirty or possibly shorting out.

It may be causing a parasitic draw on your battery and it also appears that your alternator may not be charging your battery sufficiently.

It can all be fixed as a good tech will find any parasitic draw, fix that then move on to the other two issues.

Heard back from my mechanic today. He diagnosed a bad alternator. Low battery voltage was causing erratic position sensor readings.
They are replacing alternator now. The expectation is that that will fix it.
It gives me a warm fuzzy that you mentioned this as a cause in your post. Thanks Maddog!


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[rrb6699]

They got the codes from your truck. Dodge went to OBD2 in the Rams in 1996 - I know my 1996 5.9 Ram is OBD2. It shows the typical "4 digit" codes.

not mine. have to count the check engine light flashes. my truck manufacturer in March of 1996 by Chrysler