What Does P1340 Mean?
P1340 indicates that the crankshaft position sensor and camshaft position sensor signals are out of the expected synchronization sequence. The ECU monitors the phase relationship between these two sensors to verify correct valve timing. When the signals do not correlate properly, it usually indicates a timing chain or belt has jumped one or more teeth, or a sensor issue is causing incorrect readings.
Safety Warning
Out-of-sequence crank/cam signals usually indicate a timing fault. On interference engines, a jumped timing chain or belt can cause piston-to-valve contact and catastrophic engine damage. Stop driving immediately and have the timing verified.
Common Causes
35%
Timing chain/belt has skipped one or more teeth
25%
Worn or stretched timing chain causing excessive slack
15%
Failed timing chain tensioner or guide
15%
Incorrect camshaft or crankshaft sensor installation (wrong air gap or offset)
10%
Damaged reluctor ring on camshaft or crankshaft sprocket
Diagnostic Steps
1
Use a scan tool to compare crankshaft and camshaft position sensor correlation values. Most ECUs display this as a learned offset or angle deviation.
2
Inspect the timing chain/belt for proper tension. On chain-driven engines, check for excessive slack, rattling noises at startup, or a stretched chain condition.
3
Verify the timing marks on the crankshaft and camshaft sprockets align properly per the service manual procedure.
4
Check both the CKP and CMP sensor installation for correct air gap and proper seating. Verify reluctor rings are undamaged.
5
If the timing has jumped, determine the root cause (worn tensioner, broken guide, stretched chain) before simply re-timing the engine.
Estimated Repair Cost
$300 - $1,500
Parts + labor, varies by vehicle and location
P1340 indicates that the crankshaft position sensor and camshaft position sensor signals are out of the expected synchronization sequence. The ECU monitors the phase relationship between these two sensors to verify correct valve timing. When the signals do not correlate properly, it usually indicate...
The most common cause of P1340 (Crankshaft-/Camshaft Pos.Sens.Signals Out of Sequence) is: Timing chain/belt has skipped one or more teeth
Typical repair costs for P1340 range from $300 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Out-of-sequence crank/cam signals usually indicate a timing fault. On interference engines, a jumped timing chain or belt can cause piston-to-valve contact and catastrophic engine damage. Stop driving immediately and have the timing verified.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1340 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Valve Timing / Engine Position Sensing
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
