What Does P1339 Mean?
P1339 indicates that the crankshaft position sensor and engine speed sensor signals are cross-connected, meaning the wires have been swapped during installation or repair. The ECU detects that the signal characteristics on each input do not match the expected pattern for their assigned function. This typically occurs after sensor replacement or engine work where connectors were disturbed.
Safety Warning
Cross-connected CKP and speed sensor signals cause incorrect ignition timing and fuel injection synchronization, which can lead to engine damage, stalling, or failure to start. Do not drive until corrected.
Common Causes
40%
Swapped wiring connections between CKP and engine speed sensor during recent repair
25%
Incorrect sensor installed in wrong location (sensors swapped physically)
15%
Mislabeled or incorrect aftermarket replacement sensor
12%
Pinched or rerouted harness causing signal crosstalk
8%
ECU connector terminal misalignment from improper reassembly
Diagnostic Steps
1
Review recent repair history. This code almost always appears after engine, timing, or sensor work where the CKP or engine speed sensor was disturbed.
2
Identify both sensor locations and verify each sensor is installed in its correct position. Cross-reference part numbers with the service manual.
3
Trace the wiring from each sensor back to the ECU connector and verify each wire terminates at the correct ECU pin per the wiring diagram.
4
If sensors are physically correct, disconnect both sensors and check for continuity between the two circuits, which would indicate a harness short or cross-connection.
5
Correct any wiring errors, reconnect properly, clear codes, and verify both signals are present and correct using a scan tool.
Estimated Repair Cost
$50 - $250
Parts + labor, varies by vehicle and location
P1339 indicates that the crankshaft position sensor and engine speed sensor signals are cross-connected, meaning the wires have been swapped during installation or repair. The ECU detects that the signal characteristics on each input do not match the expected pattern for their assigned function. Thi...
The most common cause of P1339 (Crankshaft Pos./Engine Speed Sensor Cross Connected) is: Swapped wiring connections between CKP and engine speed sensor during recent repair
Typical repair costs for P1339 range from $50 to $250, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cross-connected CKP and speed sensor signals cause incorrect ignition timing and fuel injection synchronization, which can lead to engine damage, stalling, or failure to start. Do not drive until corrected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1339 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Position Sensing
Difficulty
Type
Manufacturer
Recommended Tools
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