Camshaft Position Sensor "B" Circuit High (Bank 2)
The PCM detected that the camshaft position sensor 'B' signal on Bank 2 is reading lower than the expected voltage range. This sensor helps the engine control module determine precise camshaft timing for optimal fuel injection and ignition, so a faulty signal disrupts engine operation.
What You Might Notice
- Check Engine Light illuminated
- Engine bucking or surging during acceleration
- Engine stalling or dying while driving
- Hard starting or failure to restart after shutdown
- Rough idle or running very rough at startup
Most Common Causes
- 1
Open ground circuit to sensor
A broken or corroded ground wire connection to the camshaft position sensor 'B' on Bank 2 prevents proper signal return to the PCM. This causes the signal voltage to read abnormally low.
- 2
Open signal circuit wire
A break in the signal wire between the camshaft position sensor 'B' and the PCM interrupts the voltage signal, causing the low voltage reading that triggers the code.
- 3
Shorted signal wire to voltage
A short to 5 volts in the signal circuit can cause the sensor signal to read lower than normal, depending on the short location and resistance in the circuit.
- 4
Faulty camshaft position sensor
The sensor itself may be internally shorted or failing, producing an abnormally low voltage signal regardless of actual camshaft position.
How to Diagnose It
- 1
Check Open ground circuit to sensor — A broken or corroded ground wire connection to the camshaft position sensor 'B' on Bank 2 prevents proper signal return to the PCM. This causes the signal voltage to read abnormally low.
- 2
Check Open signal circuit wire — A break in the signal wire between the camshaft position sensor 'B' and the PCM interrupts the voltage signal, causing the low voltage reading that triggers the code.
- 3
Check Shorted signal wire to voltage — A short to 5 volts in the signal circuit can cause the sensor signal to read lower than normal, depending on the short location and resistance in the circuit.
- 4
Check Faulty camshaft position sensor — The sensor itself may be internally shorted or failing, producing an abnormally low voltage signal regardless of actual camshaft position.
How to Fix It
- 1
Inspect and repair ground circuit
Locate the ground wire connection to the camshaft position sensor 'B' on Bank 2. Check for corrosion, loose terminals, or broken wire. Clean corroded connections or replace damaged wiring to restore proper ground continuity.
- 2
Check signal wire for breaks or shorts
Trace the signal wire from the sensor to the PCM connector. Look for cuts, pinches, or bare wire that could cause an open or short circuit. Repair or replace damaged sections of wiring harness.
- 3
Test and replace camshaft position sensor
Using a multimeter, test the sensor resistance and voltage output. If the sensor fails voltage or resistance tests, remove and replace the camshaft position sensor 'B' on Bank 2 with an OEM or quality aftermarket unit.
- 4
Verify PCM connector and clear code
Inspect the PCM connector pins for corrosion or damage. Clean the connector contacts if needed. Clear the code with a scan tool and perform a test drive to confirm the fix has resolved the issue.
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