P2617 critical

Crankshaft Position Signal Output Circuit Open

The P2617 code means the vehicle's onboard diagnostic system has detected: Crankshaft Position Signal Output Circuit Open. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $100 - $900 (parts and labor)

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Common Symptoms

Engine will not start
No RPM signal to other modules
Tachometer reads zero while cranking
Multiple module communication errors

Probable Causes (Ranked by Likelihood)

ECM crank signal output driver failure Very High
Open wiring in crank signal output circuit High
Failed crankshaft position sensor Moderate
Damaged connector at signal distribution point Low

Step-by-Step Diagnostic Procedure

Verify crank position sensor signal at ECM input
Check output circuit wiring for continuity
Test ECM crank signal output to other modules
Inspect signal distribution connectors

Frequently Asked Questions

Is P2617 the same as a crank sensor failure?

Not exactly. P2617 is about the ECM output circuit that distributes the crank signal to other modules. The crank sensor itself may be working fine.

Why does the tachometer read zero with P2617?

The tachometer often receives its RPM signal from the ECM crank output. If this circuit is open, the tach gets no signal and reads zero.

What modules need the crank signal?

The transmission control module, instrument cluster, traction control, and other modules may all use the crank signal from the ECM for timing and speed calculations.