Volvo P0385 Crankshaft Position Sensor B Circuit

Description:

OBD-II Trouble Code Description for P0385 Volvo

Crankshaft Position Sensor “B” Circuit

What does this mean?

OBD2 Code P0385 Volvo definition:
The crankshaft position sensor (CKP) measures crankshaft location and relays this information to the PCM (Powertrain Control Module). Depending on the vehicle, the PCM uses this crankshaft position information to time the spark properly or on some systems it is only for misfire detection and does not control spark timing. The CKP sensor is stationary and works in harmony with a reluctor ring (or toothed ring) that is attached to the crankshaft. As this reluctor ring passes in front of the CKP sensor, the magnetic field created by the CKP sensor is interrupted and this creates a square wave voltage signal that the PCM interprets as crankshaft position. If the PCM detects that there are no crankshaft pulses or if it sees a problem with the pulses on the output circuit, P0385 Volvo will set.

Symptoms

Possible sumptoms of OBD code P0385 Volvo
NOTE: If the crank sensor is used only for misfire detection and NOT spark timing (this varies with the vehicle), the vehicle should start and run with MIL (Malfunction indicator lamp) illumination. Also, some vehicles require several key cycles to illuminate the MIL. If this is the case, there may be no MIL illumination until the problem often enough over time. If the crank sensor is used for BOTH misfire detection and spark timing, the vehicle may or may not start. Symptoms may include: Vehicle may not start (see above) Vehicle may run rough or misfire MIL illumination

Causes

Possible causes of OBD code P0385 Volvo
Damaged CKP sensor connector Damaged reluctor ring (missing teeth or not turning due to sheared-off keyway) Sensor output open Sensor output shorted to ground Sensor output shorted to voltage Failed crank sensor Failed PCM

Possible Solutions

Using a scan tool, check if, when engine is running or cranking, that there is an RPM signal. If there is no RPM reading, then visually inspect the crank Sensor Bnd connector for any damage and repair as necessary. If there is no visible damage, and you have access to a scope, you could check the CKP 5 Volt square wave pattern. If you do not, then, obtain a resistance reading of your crank sensor from a repair manual. (There are so many different types of crank sensors that there’s no way to put here which resistance reading is correct). Then check the resistance of the CKP sensor by disconnecting the Sensor Bnd measuring resistance of the sensor. (It is best to check resistance readings from the PCM connector. This rules out any wiring problems from the start. But it does require some mechanical skill and shouldn’t be performed if you’re not familiar with automobile electrical systems). Is the sensor within resistance specs? If not, replace the CKP sensor. If so, recheck resistance reading from the PCM connector. Is the reading still okay? If not, repair open or short in the wiring to the crank Sensor Bnd re-check. If the reading is okay, the problem is intermittent or the PCM may be at fault. Try reconnecting and checking for RPM signal again. If there is now an RPM signal, wiggle test the wiring harness to try and induce the fault.

Related Codes

P0335 Volvo P0335 Volvo P0385 Volvo P0016 Volvo P0017 Volvo P0018 Volvo P0019 Volvo P0335 Volvo P0336 Volvo P0337 Volvo P0338 Volvo P0339 Volvo P0385 Volvo P0386 Volvo P0387 Volvo P0388 Volvo P0389 Volvo


The OBD2 Code Information Be Applicable For Volvo:

2013 Volvo V40,2012 Volvo XC60,2011 Volvo XC90,2011 Volvo V60,2011 Volvo S60,2011 Volvo C30,2010 Volvo S80L,2010 Volvo S80,2010 Volvo C70,2010 Volvo C30,2009 Volvo XC60,2009 Volvo V50,2009 Volvo S60,2009 Volvo S40,2009 Volvo C30,2008 Volvo XC70,2008 Volvo V70,2008 Volvo V50,2008 Volvo S40,2007 Volvo V70,2007 Volvo S80,2007 Volvo S60,2007 Volvo C70,2007 Volvo C30,2006 Volvo XC90,2006 Volvo S80,2006 Volvo C70,2005 Volvo V50,2005 Volvo S60,2004 Volvo XC90,2004 Volvo V70,2004 Volvo V50,2004 Volvo V40,2004 Volvo S40,2003 Volvo V70 R,2003 Volvo S80,2003 Volvo S60 R

Note:

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