Question about Cars & Trucks
P1391 DODGE - Electronic Brake control Rough Road Data Unusable/unreadable
You need to see the dealer on this, it may be programing issue.
Posted on Nov 07, 2012
Manufacturer controlled ignition system is a P1391. How the pcm is controlling the timing. I have a 98 with this code and a P0320 which is an engine speed input circuit Ign/Dist. backfires and runs rough till its warm
Posted on Feb 24, 2013
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Posted on Jan 02, 2017
P1391 - Intermittent loss of CMP or CKP.
Generally, this code will indicate that the crankshaft sensor is faulty. The sensor is mounted in a fixed position in the engine block. The tip of the sensor protrudes into the crankcase at a distance of 0.05 plus or minus 0.02 inch from the crankshaft. I would check the wiring harness for loose connections. Inspect the trigger wheel behind the crankshaft pulley and the sensor for damage. replace if needed.
If a crank or cam sensor fails, the engine will not start. both of these sensor circuits can be checked with a voltmeter or lab scope.If the sensors are receiving the correct amount of voltage and have good low-resistance ground circuits, their output should be a pulsing digital signal or voltmeter reading while the engine is cranking.
If any of these conditions do not exist, the circuit needs to be repaired or the sensor needs to be replaced. The location of the Cam shaft sensor will be mounted on the distributor. Use the sensors terminals for testing. Over 7 volts is ok, but anything below that at the sensor will indicate that the sensor wires are bad. If the voltage is low at the PCM, the PCM is suspect.
Posted on Dec 15, 2009
Heryou go its a pretty lengthy diagnostic procedure it appears there is a power problem with the instrument cluster here is the code meaning hope it helps have a good dayDB
Posted on Feb 19, 2009
SOURCE: what does the p1391 code
check engine light and code P1391 crank or cam position sensor
The above can cause rough idle on the Dodge Ram 1500 5.2L V8 Engine.
Can try to replace the sensor, but verify that the wires are ok first.
Posted on Aug 12, 2010
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