What Does P0397 Mean?
This code falls within the camshaft/crankshaft position sensor range for bank 2 and is typically a manufacturer-specific or reserved code in the P0397 range. On vehicles that define it, it generally relates to a camshaft position sensor performance issue on bank 2, such as a signal that is present but does not match expected frequency or amplitude patterns. The driver may notice rough idle, poor acceleration, or occasional engine stumbles.
Common Causes
35%
Worn or failing camshaft position sensor producing weak or distorted signal
25%
Wiring harness degradation — high resistance or intermittent connection in sensor circuit
20%
Timing chain stretch or cam sprocket wear altering expected signal pattern
12%
Contaminated or misaligned reluctor ring affecting signal quality
8%
ECM software calibration issue or failed sensor input circuit
Diagnostic Steps
1
Review freeze frame data to identify the operating conditions (RPM, load, temperature) when the code set — this narrows whether the fault is cold-start, hot-soak, or load-dependent.
2
Compare bank 2 camshaft sensor signal amplitude and frequency to bank 1 using an oscilloscope at matching RPM — amplitude should be within 10% of each other.
3
Check timing chain tension by observing cam-to-crank correlation on a dual-channel scope — more than 2-3 degrees of variation at idle suggests chain stretch.
4
Inspect the sensor mounting, air gap, and reluctor wheel for physical damage, metal debris, or excessive runout.
5
Check for applicable TSBs or software updates from the manufacturer that may address this specific code.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
This code falls within the camshaft/crankshaft position sensor range for bank 2 and is typically a manufacturer-specific or reserved code in the P0397 range. On vehicles that define it, it generally relates to a camshaft position sensor performance issue on bank 2, such as a signal that is present b...
The most common cause of P0397 () is: Worn or failing camshaft position sensor producing weak or distorted signal
Typical repair costs for P0397 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive for short distances to a repair facility. The ECM will use default timing values which reduce performance. If accompanied by misfires or stalling, have the vehicle towed instead.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0397 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Timing / Variable Valve Timing
Difficulty
Type
Generic (SAE)
Recommended Tools
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