Camshaft Position Signal Output Circuit High
The P2616 code means the vehicle's onboard diagnostic system has detected: Camshaft Position Signal Output Circuit High. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $100 - $800 (parts and labor)
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Common Symptoms
- Engine misfires and rough running
- Timing out of synchronization
- Other modules reporting cam signal errors
- Check engine light on
Probable Causes (Ranked by Likelihood)
- Short to voltage in cam signal output wiring Very High
- ECM output driver stuck high High
- Wiring crossed with another signal circuit Moderate
- Electromagnetic interference affecting signal Low
Step-by-Step Diagnostic Procedure
-
Check cam signal output circuit for short to power
-
Verify ECM cam output with oscilloscope
-
Inspect wiring for contact with adjacent circuits
-
Check for aftermarket electronics causing interference
Frequently Asked Questions
What happens when the cam signal is stuck high?
Receiving modules see a constant signal instead of a pulsing waveform, making it impossible to determine camshaft position. Fuel injection timing is lost.
Can aftermarket electronics cause P2616?
Yes. Improperly shielded aftermarket electronics can introduce electrical noise or voltage into the cam signal circuit.
Do I need an oscilloscope to diagnose P2616?
An oscilloscope provides the best view of the cam signal waveform, but a scan tool monitoring cam signal data and a multimeter checking for shorts can also be effective.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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