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Home / DTC / P0026 — Intake Valve Control Solenoid Circuit Range/Performance Bank 1

P0026 — Intake Valve Control Solenoid Circuit Range/Performance Bank 1

Detailed page for trouble code P0026.

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Code

P0026

Generic P — Powertrain

Intake Valve Control Solenoid Circuit Range/Performance Bank 1

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring to intake VVT solenoid (bank 1)
  • Poor connector connection or corrosion at solenoid connector
  • Faulty intake VVT solenoid (stuck, clogged, or failed)
  • Low engine oil level, dirty oil, or clogged oil passages
  • Faulty camshaft phaser or mechanical binding
  • Faulty PCM/ECM or internal driver failure

Symptoms

  • Check Engine Light / MIL illuminated
  • Reduced engine performance or hesitation
  • Rough idle or surging
  • Decreased fuel economy
  • Possible engine noise (timing-related) or limp-home mode
  • Failed emissions test

What to check

  • Read freeze frame and stored data with a full OBD-II scanner; note related codes
  • Verify engine oil level and condition (change if dirty or low)
  • Visually inspect VVT solenoid connector and wiring harness for damage/corrosion
  • Backprobe solenoid connector and check for battery power, ground, and control signal with engine cranking/running
  • Measure solenoid coil resistance with a multimeter
  • Use a scan tool to command the VVT solenoid ON/OFF and observe cam position/liveness (if cam position sensor data available)

Signal parameters

  • Solenoid coil resistance: typically ~6–25 ohms (manufacturer-specific; check spec)
  • Control voltage when commanded: near battery voltage (~11–14 V) or switched to ground depending on design
  • Idle/uncommanded state: solenoid circuit may be pulled to ground or released depending on design
  • PWM duty cycle: 0–100% (variable depending on commanded cam advance/retard)
  • PWM frequency: commonly tens to a few hundred Hz (varies by manufacturer)
  • Expected response: camshaft position should change when solenoid is commanded (observe with scan tool)

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame. Note engine temp, RPM, and oil temp during fault.
  2. Verify oil level and condition. If oil is low/dirty, top up or change oil, clear codes and retest.
  3. Visually inspect harness and connector for bank 1 intake VVT solenoid. Repair any damaged wiring or corroded terminals.
  4. With ignition off, disconnect solenoid and measure coil resistance. Compare to manufacturer spec. Replace if open or out of range.
  5. With connector attached, backprobe and verify battery power and ground. Start engine or crank and check control signal with scope or multimeter (DC or duty-cycle).
  6. Command the solenoid ON/OFF using a scan tool and observe change in duty cycle/voltage and corresponding camshaft position data (or engine behavior).
  7. If electrical supply and control are good but there is no mechanical response, remove solenoid and bench-test (apply appropriate voltage) and inspect for clogging/contamination. Clean or replace as required.
  8. Check oil pressure and oil passages to cam phaser. If oil flow is restricted, correct oil system issues and replace contaminated components as needed.
  9. If solenoid, wiring, and oil system are OK, inspect cam phaser/timing chain for mechanical damage or incorrect timing. Repair mechanical timing issues.
  10. If all above pass, consider PCM/ECM driver fault—verify with a known-good module procedure before ECM replacement.
  11. After repair, clear codes, perform a road test and re-scan to confirm the fault does not return.

Likely causes

  • Faulty or clogged intake VVT solenoid
  • Wiring harness open/short or poor ground/power feed
  • Low or contaminated oil preventing solenoid or phaser operation
  • Connector corrosion or poor pin contact

Fault status

⚠️ Status
Intake Valve Control Solenoid Circuit Range/Performance — Bank 1. The VVT/intake cam actuator circuit is not operating within expected range or performance parameters.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

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Code

P0026

LAND ROVER P — Powertrain

Intake valve control solenoid - circuit range/ performance (bank 1)

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring to intake VVT solenoid (bank 1)
  • Poor connector connection or corrosion at solenoid connector
  • Faulty intake VVT solenoid (stuck, clogged, or failed)
  • Low engine oil level, dirty oil, or clogged oil passages
  • Faulty camshaft phaser or mechanical binding
  • Faulty PCM/ECM or internal driver failure

Symptoms

  • Check Engine Light / MIL illuminated
  • Reduced engine performance or hesitation
  • Rough idle or surging
  • Decreased fuel economy
  • Possible engine noise (timing-related) or limp-home mode
  • Failed emissions test

What to check

  • Read freeze frame and stored data with a full OBD-II scanner; note related codes
  • Verify engine oil level and condition (change if dirty or low)
  • Visually inspect VVT solenoid connector and wiring harness for damage/corrosion
  • Backprobe solenoid connector and check for battery power, ground, and control signal with engine cranking/running
  • Measure solenoid coil resistance with a multimeter
  • Use a scan tool to command the VVT solenoid ON/OFF and observe cam position/liveness (if cam position sensor data available)

Signal parameters

  • Solenoid coil resistance: typically ~6–25 ohms (manufacturer-specific; check spec)
  • Control voltage when commanded: near battery voltage (~11–14 V) or switched to ground depending on design
  • Idle/uncommanded state: solenoid circuit may be pulled to ground or released depending on design
  • PWM duty cycle: 0–100% (variable depending on commanded cam advance/retard)
  • PWM frequency: commonly tens to a few hundred Hz (varies by manufacturer)
  • Expected response: camshaft position should change when solenoid is commanded (observe with scan tool)

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame. Note engine temp, RPM, and oil temp during fault.
  2. Verify oil level and condition. If oil is low/dirty, top up or change oil, clear codes and retest.
  3. Visually inspect harness and connector for bank 1 intake VVT solenoid. Repair any damaged wiring or corroded terminals.
  4. With ignition off, disconnect solenoid and measure coil resistance. Compare to manufacturer spec. Replace if open or out of range.
  5. With connector attached, backprobe and verify battery power and ground. Start engine or crank and check control signal with scope or multimeter (DC or duty-cycle).
  6. Command the solenoid ON/OFF using a scan tool and observe change in duty cycle/voltage and corresponding camshaft position data (or engine behavior).
  7. If electrical supply and control are good but there is no mechanical response, remove solenoid and bench-test (apply appropriate voltage) and inspect for clogging/contamination. Clean or replace as required.
  8. Check oil pressure and oil passages to cam phaser. If oil flow is restricted, correct oil system issues and replace contaminated components as needed.
  9. If solenoid, wiring, and oil system are OK, inspect cam phaser/timing chain for mechanical damage or incorrect timing. Repair mechanical timing issues.
  10. If all above pass, consider PCM/ECM driver fault—verify with a known-good module procedure before ECM replacement.
  11. After repair, clear codes, perform a road test and re-scan to confirm the fault does not return.

Likely causes

  • Faulty or clogged intake VVT solenoid
  • Wiring harness open/short or poor ground/power feed
  • Low or contaminated oil preventing solenoid or phaser operation
  • Connector corrosion or poor pin contact

Fault status

⚠️ Status
Intake Valve Control Solenoid Circuit Range/Performance — Bank 1. The VVT/intake cam actuator circuit is not operating within expected range or performance parameters.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

P0025 P0011 P0012 P0021 P0020 P0016
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