Engine-Codes.com is now AutoCodes.com - Same great content, new name.
Login Register Shop Owners


P0391 - Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?
Share Share on Facebook Share on Twitter Share on Linkedin Share on Google Plus AutoCodes.com Print Version PDF Print
P0391 Comments |  Add Comment
Possible causes
- Faulty Camshaft Position Sensor
- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery
What does this mean? What does this mean?
Tech notes
Sometimes and in some models, low battery voltage or a weak starter can can trigger a Camshaft Position Sensor code.
What does this mean? What does this mean?
When is the code detected?
The camshaft position sensor signal sent to the Engine Control Module (ECM) during the first few seconds of engine cranking is out of range.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- Engine Stall
P0391 Description

The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. This information is used by the Engine Control Module (ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of camshaft (intake) to identify a particular cylinder. The camshaft position sensor senses the piston position. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.

When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.

When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.

P0391 Information for specific makes
Need more help?
Do you need more help with the P0391 code? ask a question to our users or search the top hand picked automotive forums for more information

(You will add more details to the question in the next step)
Help AutoCodes.com
Help us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are symptoms is your vehicle for the P0391 code? Have you replaced any parts?
Any information is appreciated. Thanks
AutoCodes.com Comments Powered by Disqus
Repair Importance Level: 3
1=Low 2=Medium 3=High What does this mean?
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard What does this mean?
Need A Repair Shop?
Find local automotive repair shops in your area.
AutoCodes.com Shops
4x4 Land LLC
Chantilly, VA 20148
(703) 263-3307
A & G Car Care
Chantilly, VA 20148
(703) 378-2005
A & J Automotive
Centreville, VA 20148
(703) 817-9880
See More Shops...
Ask OBDII Question

Browse All Codes For Specific Model YearBeta
Ford F150 1998 Ford F150
1999 Ford F150
2000 Ford F150
2001 Ford F150
2002 Ford F150
2003 Ford F150
Ford Fusion 2006 Ford Fusion
2007 Ford Fusion
2008 Ford Fusion
2009 Ford Fusion
2010 Ford Fusion
2011 Ford Fusion
2012 Ford Fusion
Honda Accord 2008 Honda Accord
2009 Honda Accord
2010 Honda Accord
Honda Civic 1996 Honda Civic
1997 Honda Civic
1998 Honda Civic
1999 Honda Civic
2000 Honda Civic
Infiniti G35 2003 Infiniti G35
2004 Infiniti G35
2005 Infiniti G35
2006 Infiniti G35
Nissan Altima 2002 Nissan Altima
2003 Nissan Altima
2004 Nissan Altima
2005 Nissan Altima
2006 Nissan Altima
2008 Nissan Altima
2009 Nissan Altima
2010 Nissan Altima
2011 Nissan Altima
2012 Nissan Altima
Nissan Maxima 2005 Nissan Maxima
2006 Nissan Maxima
2007 Nissan Maxima
2008 Nissan Maxima
Nissan Pathfinder 2005 Nissan Pathfinder
2006 Nissan Pathfinder
2007 Nissan Pathfinder
2008 Nissan Pathfinder
2009 Nissan Pathfinder
2010 Nissan Pathfinder
2011 Nissan Pathfinder
2012 Nissan Pathfinder
Nissan Rogue 2008 Nissan Rogue
2009 Nissan Rogue
2010 Nissan Rogue
2011 Nissan Rogue
2012 Nissan Rogue
2013 Nissan Rogue
Nissan Sentra 2002 Nissan Sentra
2003 Nissan Sentra
2004 Nissan Sentra
2005 Nissan Sentra
2006 Nissan Sentra
2007 Nissan Sentra
2008 Nissan Sentra
2009 Nissan Sentra
2010 Nissan Sentra
2011 Nissan Sentra
2012 Nissan Sentra
Toyota Camry 1997 Toyota Camry
1998 Toyota Camry
1999 Toyota Camry
2000 Toyota Camry
2001 Toyota Camry
2006 Toyota Camry
2007 Toyota Camry
2008 Toyota Camry
2009 Toyota Camry
2010 Toyota Camry
2011 Toyota Camry
Toyota Corolla 2005 Toyota Corolla
Toyota Highlander 2001 Toyota Highlander
2002 Toyota Highlander
2003 Toyota Highlander
2004 Toyota Highlander
2005 Toyota Highlander
2006 Toyota Highlander
2007 Toyota Highlander
Toyota Prius 2004 Toyota Prius
2005 Toyota Prius
2006 Toyota Prius
2007 Toyota Prius
2008 Toyota Prius
2009 Toyota Prius
Scion xB 2005 Scion xB
2006 Scion xB
2007 Scion xB
Need A Repair Shop?
Find local automotive repair shops in your area.
4x4 Land LLC
Chantilly, VA 20148
(703) 263-3307
A & G Car Care
Chantilly, VA 20148
(703) 378-2005
A & J Automotive
Centreville, VA 20148
(703) 817-9880
Home - For Shop Owners - About AutoCodes.com - Privacy Policy - Terms and Conditions -
Copyright 2010-2015 AutoCodes.com
Posted by AutoCodes.com