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DTC codes / P26xx · Computer and output circuits / P2616

P2616Camshaft Position Signal Output Circuit High

P2616 means the engine control module (ECM) has detected a high-voltage condition on the camshaft position signal output circuit, which is the wire the ECM uses to send a reference signal to other modules or devices. The ECM monitors this output circuit and sets the code when the voltage exceeds the expected range, indicating an open circuit, short to voltage, or a faulty component on that output path.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaComputer and output circuits

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms
  • Rough idle or intermittent misfire if the camshaft signal is disrupted
  • Reduced engine performance or limp mode in some vehicles
  • Hard starting or stalling when the output signal is lost
  • Poor fuel economy or increased emissions due to incorrect camshaft timing data

Common causes, most likely first

  1. Open or damaged wire in the camshaft position signal output circuit
  2. Short to voltage on the output circuit, often from chafed insulation
  3. Faulty camshaft position sensor or actuator on the output side
  4. Corroded or loose electrical connector at the sensor or ECM
  5. Failed ECM driver circuit for the camshaft position output
  6. Aftermarket electrical accessories improperly tapped into the circuit

How to diagnose and fix it

  1. Inspect the camshaft position sensor connector and wiring for corrosion, looseness, or damage
  2. Check for aftermarket accessories or recent repairs that may have disturbed the circuit
  3. Measure voltage on the output circuit with a multimeter and compare to manufacturer specifications
  4. Perform a wiggle test on the harness while monitoring live data to reveal intermittent opens or shorts
  5. Disconnect the component on the output circuit and recheck voltage to isolate the fault
  6. Repair or replace the damaged section of wire or connector, then clear the code and verify
  7. If the circuit tests good, test or replace the camshaft position sensor or ECM as a last resort

Why this code is often misdiagnosed

  • P2616 refers to the output side of the camshaft position signal circuit, not the sensor input, so replacing the sensor without testing the output wire often fails to fix the code.
  • A short to voltage on the output circuit can be caused by a nearby accessory wire, such as a remote starter or audio amplifier, that was routed too close to the harness.
  • Intermittent high-voltage readings often appear only when the engine is hot or vibrating, so a simple static multimeter test may miss the fault.
  • Some vehicles use the camshaft position output signal to drive a tachometer or other module, and a fault there can set P2616 without affecting engine performance.
  • A failed ECM driver is rare but possible; always rule out wiring and connectors before condemning the computer.

Can I keep driving with P2616?

You can usually drive with P2616 if the engine runs normally, but avoid heavy acceleration or long trips until the circuit is repaired. If the engine misfires, stalls, or enters limp mode, stop driving and have the vehicle towed to prevent damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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