Faulty camshaft position actuator position sensor 'C' on bank 1; Damaged or corroded wiring or connector at the sensor or ECM; Contaminated or degraded engine oil affecting the phaser and sensor operation; Sticking or failed camshaft phaser (actuator) due to sludge or mechanical wear; Low oil pressure or oil flow restriction to the phaser; ECM software calibration issue or internal fault (less common)

DTC codes / P03xx · Ignition system and misfire / P03E6

P03E6A Camshaft Position Actuator Position Sensor C Range/Performance Bank 1

P03E6 indicates that the engine control module (ECM) has detected an out-of-range or performance problem with the camshaft position actuator position sensor 'C' on bank 1. The sensor reports the actual position of the camshaft phaser, and the ECM compares this signal against the commanded position to verify the variable valve timing system is responding correctly.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or unstable engine speed, especially when cold
Reduced engine power or sluggish acceleration due to incorrect camshaft timing
Poor fuel economy or increased emissions
Intermittent stalling or hesitation during light throttle
A noticeable rattle or ticking from the timing cover area if the phaser is mechanically worn

Common causes, most likely first

Faulty camshaft position actuator position sensor 'C' on bank 1
Damaged or corroded wiring or connector at the sensor or ECM
Contaminated or degraded engine oil affecting the phaser and sensor operation
Sticking or failed camshaft phaser (actuator) due to sludge or mechanical wear
Low oil pressure or oil flow restriction to the phaser
ECM software calibration issue or internal fault (less common)

How to diagnose and fix it

Perform a visual inspection of the sensor, connector, and wiring for damage or oil intrusion
Check engine oil level and condition; change oil and filter if contaminated or overdue
Use a scan tool to monitor live camshaft position data and compare commanded versus actual phaser position
Test the sensor signal with a multimeter or oscilloscope for proper voltage and waveform
Verify oil pressure and flow to the phaser; inspect oil control valve screens for debris
Replace the camshaft position actuator position sensor if testing confirms it is faulty
If the phaser is mechanically stuck or worn, replace the camshaft phaser assembly and recheck timing

Oil quality and phaser response checks

A dirty or restricted oil control valve screen is a frequent hidden cause of this code, as it prevents the phaser from reaching commanded positions even when the sensor itself is good.
The code can set intermittently due to a loose ground connection at the engine block, which corrupts the sensor signal without any hard failure.
Many technicians replace the sensor first, but the real fault often lies in the phaser or oil circuit; always verify actual phaser movement with a scan tool before condemning parts.
After an oil change with the correct viscosity, some vehicles will clear this code on their own once the phaser responds correctly, so a short test drive may be diagnostic.
This code is specific to bank 1 and sensor 'C'; on engines with multiple camshafts, misreading the bank or sensor designation can lead to replacing the wrong component.

Can I keep driving with P03E6?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration or sustained high speeds because incorrect camshaft timing can cause poor performance and increased emissions. If the engine runs roughly or stalls, stop driving and have it towed to prevent further damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.