Camshaft Position Sensor "B" Circuit Intermittent (Bank 2)
The engine control module detects an intermittent electrical fault in the camshaft position sensor "B" circuit on bank 2, indicating the sensor signal is unstable or dropping out periodically. This causes the PCM to lose synchronization data needed for proper fuel injection and ignition timing on that bank.
What You Might Notice
- Check Engine Light illuminated
- Intermittent engine bucking or surging
- Engine dies out but restarts immediately
- Rough idle at startup
- Possible hesitation during acceleration
Most Common Causes
- 1
Loose or corroded sensor connector
The camshaft position sensor "B" connector on bank 2 may have a loose pin, corrosion, or moisture intrusion causing intermittent signal loss.
- 2
Damaged wiring in sensor circuit
The power, ground, or signal wire to sensor "B" may have a pinch, abrasion, or intermittent break in the insulation causing the connection to drop in and out.
- 3
Failing camshaft position sensor "B"
The sensor itself may be intermittently failing internally or losing electrical continuity as temperature changes, even if it appears functional most of the time.
- 4
PCM power supply or ground issue
An intermittent loss of power or ground to the PCM's sensor input circuit can mimic a sensor fault, especially during engine cranking or load changes.
How to Diagnose It
- 1
Check Loose or corroded sensor connector — The camshaft position sensor "B" connector on bank 2 may have a loose pin, corrosion, or moisture intrusion causing intermittent signal loss.
- 2
Check Damaged wiring in sensor circuit — The power, ground, or signal wire to sensor "B" may have a pinch, abrasion, or intermittent break in the insulation causing the connection to drop in and out.
- 3
Check Failing camshaft position sensor "B" — The sensor itself may be intermittently failing internally or losing electrical continuity as temperature changes, even if it appears functional most of the time.
- 4
Check PCM power supply or ground issue — An intermittent loss of power or ground to the PCM's sensor input circuit can mimic a sensor fault, especially during engine cranking or load changes.
How to Fix It
- 1
Inspect and clean sensor connector
Locate the camshaft position sensor "B" connector on bank 2, disconnect it, and clean both the male and female terminals with electrical contact cleaner. Reconnect firmly and test drive to see if the code clears.
- 2
Check wiring for damage
Inspect the wiring harness from the sensor connector to the PCM for cuts, pinches, bare spots, or water intrusion. Repair any damaged sections with proper electrical tape or replace the entire harness if multiple faults are found.
- 3
Replace camshaft position sensor "B"
If wiring and connectors are clean and secure, the sensor itself is likely failing. Remove the old sensor from bank 2 and install a new camshaft position sensor "B", then clear the code and retest.
- 4
Test PCM power and ground circuits
Use a multimeter to verify stable 5V reference voltage and ground continuity at the sensor connector. If voltage is dropping out intermittently, suspect a PCM supply issue and have the PCM input circuit tested by a specialist.
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