P2695 – Cylinder 1 Deactivation/Intake Valve Control Circuit High

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: Circuit High | Location: Cylinder 1

Definition source: SAE J2012/J2012DA (industry standard)

P2695 indicates the powertrain control module has detected a high electrical signal condition in the Cylinder 1 deactivation/intake valve control circuit. In practical terms, the module expected to see a commanded or feedback signal within an acceptable operating window, but the circuit appeared electrically “too high,” which commonly points to a short-to-power, an open ground/return, a disconnected load, or a signal line being pulled up when it should not be. Exact circuit design (driver type, feedback strategy, and whether the actuator is integrated with other hardware) varies by vehicle, so always verify connector pinouts, wire colors, and test procedures in the correct service information before making conclusions or replacing parts.

What Does P2695 Mean?

P2695 – Cylinder 1 Deactivation/Intake Valve Control Circuit High means the control module has identified a high-input (circuit high) fault in the electrical circuit used to control cylinder 1 deactivation related to intake valve control. Per standardized DTC structure conventions, the code reports an electrical fault classification rather than proving a mechanical problem. “Circuit High” specifically indicates the monitored voltage or signal state is higher than expected for the current command or operating condition, as determined by the module’s internal diagnostics. The exact monitored element may be the actuator control line, a feedback/diagnostic line, or the driver’s sense circuit, depending on the system architecture.

Quick Reference

  • Subsystem: Cylinder 1 deactivation / intake valve control electrical circuit (actuator control and related wiring).
  • Common triggers: Short-to-power on the control/signal line, open ground/return, unplugged actuator, or damaged connector causing the circuit to float high.
  • Likely root-cause buckets: Wiring/connector faults, actuator/solenoid issues, power/ground distribution problems, driver circuit concerns within the control module.
  • Severity: Usually moderate; may cause reduced performance, roughness, and elevated emissions; severity varies by vehicle strategy.
  • First checks: Scan data and freeze frame, visual harness/connector inspection, check for other related DTCs, verify power/ground integrity to the circuit.
  • Common mistakes: Replacing the actuator immediately without confirming a short-to-power or an open ground, or ignoring shared power/ground circuits affecting multiple components.

Theory of Operation

Cylinder deactivation/intake valve control systems use an electrically controlled device (often a solenoid/actuator) to change valve operation for a specific cylinder under certain load and speed conditions. The control module commands the device on/off or via a duty-controlled signal, and it may also monitor the circuit for electrical plausibility using internal driver diagnostics and, on some designs, a feedback line.

When the module commands the circuit and detects the control/sense signal is higher than expected, it sets a “circuit high” fault. This can occur if the control wire is shorted to a power feed, if the ground/return path is open so the circuit cannot pull low, or if the load is disconnected and the circuit is pulled high internally. Monitoring strategy and fault criteria vary by vehicle.

Symptoms

  • Check engine light: MIL illuminated and P2695 stored as a current or pending code.
  • Roughness: Rough idle or vibration if cylinder deactivation/intake valve control is disabled or inconsistent.
  • Reduced performance: Noticeable loss of power or altered throttle response depending on how the system is managed.
  • Fuel economy: Decreased fuel economy if the deactivation function is inhibited.
  • Drive mode changes: Engine may remain in a default operating mode to protect components and emissions control.
  • Misfire-like feel: Hesitation or uneven power delivery without confirming a true ignition/fuel misfire.
  • Additional DTCs: Companion electrical codes for related actuators, power supply, or ground circuits may be present.

Common Causes

  • Harness damage in the cylinder deactivation/intake valve control circuit (chafing, pinched wiring, melted insulation) creating a short-to-power
  • Connector issues at the cylinder 1 deactivation/intake valve control actuator/solenoid (backed-out terminals, corrosion, moisture intrusion, poor pin fit) causing an unintended high signal
  • Open or high-resistance ground path for the actuator/solenoid or its control driver circuit, allowing the control line to remain high
  • Short-to-voltage from an adjacent powered circuit (shared loom, aftermarket add-on wiring, improper repairs/splices) feeding the control line
  • Internal fault in the cylinder 1 deactivation/intake valve control actuator/solenoid (electrical short) pulling the circuit high
  • Fault in the engine control module output stage/driver for the cylinder 1 control circuit (driver stuck high) or an internal reference pull-up issue
  • Incorrectly routed or tensioned harness near moving/hot components causing intermittent contact to power and repeated “circuit high” detection
  • Low-quality prior electrical repair (wrong gauge wire, unsealed splice, incorrect terminal) leading to intermittent shorts or biased high readings

Diagnosis Steps

Tools typically needed: a scan tool with live data and bi-directional controls (if supported), a digital multimeter, and access to the correct wiring diagram and connector views for your vehicle. Helpful additions include a test light appropriate for automotive circuits, back-probing pins, and supplies for terminal inspection/repair. Use service information for exact circuit identification and pinouts.

  1. Confirm the code and context: Scan all modules for DTCs, record freeze-frame data, and note whether P2695 is current or history. Address any battery/charging or communication codes first if they could affect control-module outputs.
  2. Verify the complaint with a controlled recheck: Clear DTCs and run an appropriate drive cycle or functional test (varies by vehicle). If P2695 resets quickly, treat it as an active electrical fault rather than an intermittent.
  3. Identify the exact circuit path: Using the wiring diagram, determine whether the cylinder 1 deactivation/intake valve control uses a dedicated power feed plus a control/ground, or a module-driven control line with a shared feed. This defines what “circuit high” means for your platform.
  4. Do a targeted visual inspection: Inspect the actuator/solenoid connector and the harness routing from the engine to the control module. Look for rubbed-through insulation, contact with sharp brackets, heat damage, oil saturation, and signs of prior repairs.
  5. Connector and terminal checks: With the connector disconnected, inspect terminals for spread pins, corrosion, water tracks, and terminal push-out. Verify proper terminal tension (gentle drag test varies by procedure) and confirm the connector locks fully seat.
  6. Wiggle test with live monitoring: Reconnect components as needed and monitor relevant live data/PID(s) and DTC status while gently moving the harness at known stress points (near the actuator connector, along the valve cover area, and where the loom crosses brackets). If the status changes or the fault sets during movement, isolate the exact section.
  7. Check for short-to-power on the control circuit: Key on/engine off (procedure varies), disconnect the actuator/solenoid and measure the control circuit for unintended voltage present when it should not be. If voltage is present with the actuator disconnected, suspect short-to-power in the harness or a control module driver stuck high.
  8. Isolate harness vs. module output: With the actuator disconnected, disconnect the control module connector (as directed by service info) and retest the control wire for continuity to power sources. If the “high” condition disappears when the module is unplugged, the driver may be biased high or internally failed; if it remains, the harness is likely shorted to a powered circuit.
  9. Verify power feed and ground integrity under load: If the actuator/solenoid has a separate feed and ground, perform voltage-drop testing on the ground and power sides while commanding the function (or during conditions when it normally operates). Excessive drop on the ground path can leave the control signal abnormally high and trigger a “circuit high” fault.
  10. Actuator/solenoid electrical check: With the component unplugged, check the actuator/solenoid for internal electrical faults per service information (do not assume resistance values). If it fails basic checks or causes the control line to behave abnormally when connected, replace only after confirming wiring and power/ground are correct.
  11. Command test (if supported): Use bi-directional controls to command the cylinder 1 deactivation/intake valve control on/off while observing circuit response with a meter or scan tool feedback. A circuit that remains high regardless of command points to a short-to-power or a stuck-high driver.
  12. Repair verification: After repairs, clear codes, run the functional test/drive cycle, and review pending and confirmed DTCs. Recheck live data and confirm the harness no longer triggers faults during a final wiggle test.

Professional tip: When chasing a “circuit high” fault, prioritize isolation: test the control line with the actuator disconnected, then with the control module disconnected, to quickly determine whether the unwanted high signal is coming from a harness short-to-power or from the module’s output stage. This prevents unnecessary parts replacement and focuses repairs on the correct side of the circuit.

Need wiring diagrams and factory-style repair steps?

Powertrain faults often require exact wiring diagrams, connector pinouts, and guided test steps. A repair manual can help you confirm the cause before replacing parts.

Factory repair manual access for P2695

Check repair manual access

Possible Fixes & Repair Costs

Repair costs for P2695 vary widely because the same “circuit high” result can be caused by wiring faults, connector issues, a failed cylinder deactivation/intake valve control actuator, or a control-module driver problem. Labor time depends on access and the diagnostic path required.

  • Repair wiring damage in the cylinder 1 deactivation/intake valve control circuit (chafed insulation, pinched harness, melted sections) found during inspection and testing.
  • Clean, repair, or replace connectors/terminals with corrosion, moisture intrusion, bent pins, spread terminals, poor pin fit, or loose locks; ensure proper terminal tension and seating.
  • Correct a short-to-power condition by isolating and repairing the section of harness contacting a power feed or rubbed-through area energizing the control line.
  • Restore grounds and power feeds that can indirectly drive the circuit signal high (repair ground splice, ground eyelet, or shared ground path; verify integrity with voltage-drop testing).
  • Replace the cylinder 1 deactivation/intake valve control actuator/solenoid only after confirming it is electrically or mechanically causing the circuit to remain high per service-information tests.
  • Address control-module issues (driver circuit fault, connector pin damage, water intrusion) only after ruling out external wiring/actuator faults; module replacement may require programming (varies by vehicle).

Can I Still Drive With P2695?

You can sometimes drive with P2695, but it depends on how the vehicle responds when cylinder deactivation/intake valve control is disabled or behaving unexpectedly. If you notice reduced power, rough running, misfire, stalling, a flashing malfunction indicator, or any brake/steering warning indicators, do not continue driving; have the vehicle inspected and repaired. If symptoms are mild, drive conservatively, avoid heavy load/high speed, and prioritize diagnosis soon because a “circuit high” fault can be intermittent and worsen without warning.

What Happens If You Ignore P2695?

Ignoring P2695 can lead to persistent warning lights, reduced performance, poor fuel economy, and continued drivability complaints if the system is disabled as a protective response. If the high-input condition is caused by damaged wiring, ongoing abrasion or heat exposure can escalate into additional electrical faults, fuse issues, or more widespread harness damage. Prolonged operation with unstable cylinder control may also increase vibration and strain on related components, even if the vehicle still appears to run normally at times.

Compare nearby valve cylinder trouble codes with similar definitions, fault patterns, and diagnostic paths.

  • P2699 – Cylinder 2 Deactivation/Intake Valve Control Circuit High
  • P2698 – Cylinder 2 Deactivation/Intake Valve Control Circuit Low
  • P2696 – Cylinder 1 Deactivation/Intake Valve Control Circuit Range/Performance
  • P2694 – Cylinder 1 Deactivation/Intake Valve Control Circuit Low
  • P2955 – Intake Air Metering Control Valve Control Circuit High
  • P2948 – Intake Air Metering Control Valve Circuit High

Key Takeaways

  • P2695 indicates a circuit high condition in the cylinder 1 deactivation/intake valve control circuit, not a confirmed mechanical failure by itself.
  • Most successful repairs start with wiring and connectors, especially checking for shorts-to-power, poor terminal fit, and corrosion.
  • Test-driven diagnosis matters: verify the fault with scan data, pinpoint with targeted electrical tests, and confirm the fix with a complete drive cycle.
  • Symptoms can vary by vehicle, from no obvious change to rough running, reduced power, or a disabled cylinder deactivation strategy.
  • Do not replace parts on code alone; confirm the actuator and the module driver only after the circuit is proven good or bad.

Vehicles Commonly Affected by P2695

  • Vehicles with cylinder deactivation systems that actively control intake valve operation or cylinder-enable strategies.
  • Engines using electronically controlled valve actuation or oil-pressure-mediated actuators commanded by a solenoid circuit.
  • Applications with complex engine harness routing near hot surfaces, sharp brackets, or moving components that can chafe wiring.
  • Vehicles exposed to moisture (road spray, condensation, or leak paths) that can corrode low-current control connectors.
  • Higher-mileage vehicles where terminal tension, insulation integrity, or harness supports may be degraded.
  • Vehicles with prior engine repairs where connectors may be left partially seated or wiring may be pinched during reassembly.
  • Platforms with shared power/ground splices where a single splice fault can affect multiple control circuits and skew signals high.
  • Vehicles with aftermarket electrical modifications that may introduce unintended power feeds or altered grounding paths.

FAQ

Does P2695 mean the engine is permanently running on fewer cylinders?

No. P2695 specifically indicates the control module detected a “circuit high” condition in the cylinder 1 deactivation/intake valve control circuit. Depending on the strategy (varies by vehicle), the module may disable cylinder deactivation, limit its operation, or apply a fallback mode, but the DTC alone does not confirm the cylinder is permanently deactivated.

What does “circuit high” usually indicate for this code?

“Circuit high” typically points to an electrical signal that is higher than expected for the operating condition. Common causes include a short-to-power, an open ground on the control side, connector/terminal issues that prevent proper current control, or a fault in the actuator/solenoid or the module’s driver circuitry. Exact logic varies by vehicle, so confirm with service information and testing.

Should I replace the cylinder deactivation/intake valve control solenoid immediately?

Not based on the code alone. Because P2695 is a circuit-high fault, wiring and connector problems are frequent and can mimic a failed solenoid. A correct approach is to verify power and ground integrity, check for a short-to-power on the control circuit, and confirm actuator behavior with commanded tests before replacing any components.

Can low oil level or oil quality cause P2695?

P2695 is defined as an electrical “circuit high” fault, so it is primarily diagnosed as a wiring/connector/actuator/module electrical issue. Oil condition may affect how a cylinder deactivation mechanism operates on some designs, but it does not directly explain a high electrical input without a corresponding electrical fault. If oil issues are present, correct them, but continue with circuit testing.

How do I confirm the repair is complete after fixing P2695?

After repairs, clear the DTC, then verify the circuit behaves normally under commanded operation using a scan tool (if supported) and confirm the code does not reset during a complete drive cycle. Recheck connector seating, harness routing, and perform a final visual inspection to ensure the repaired section is protected from heat, abrasion, and vibration.

Always confirm the final repair by verifying the cylinder 1 deactivation/intake valve control circuit no longer reads high under the same conditions that originally set P2695, using the test procedures and specifications in the appropriate service information.