Code
P02E3
Generic
P — Powertrain
Diesel Intake Air Flow A Control Circuit High
Views:
UK: 19
EN: 30
RU: 37
AI status
Completed
Completed
100%
Causes
- Short to battery voltage on the intake air flow A control circuit
- Open or damaged wiring harness allowing stray/high voltage
- Corroded, bent or pushed-back terminal in the connector
- Faulty intake air flow actuator/solenoid (internal short or failed electronics)
- Poor or missing ground at actuator or ECM
- Faulty ECM (rare) or incorrect programming/calibration
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine performance or limp-home mode
- Poor idle or rough running
- Loss of intake air control (unexpected boost or reduced airflow)
- Increased black smoke or elevated emissions from diesel exhaust
What to check
- Retrieve freeze frame and live data for intake air flow/actuator command and feedback
- Visually inspect wiring and connectors for damage, corrosion, pin push-out, or melted insulation
- Backprobe the actuator connector and measure signal voltage with key on/engine running
- Check for proper ground(s) at actuator and ECM
- Perform a wiggle test while monitoring signal for intermittent changes
- Scan for related codes that may provide additional context (turbo, MAF, throttle, EGR)
Signal parameters
- Normal control circuit behavior typically shows a commanded duty cycle or 0–12V control signal depending on component design
- High-voltage fault flagged when circuit voltage is higher than the expected maximum (often near battery voltage when it should be low or modulated)
- Expected resting voltages: actuator control circuits may be low (0V) or a regulated reference; a reading consistently near battery voltage (≈11–14V) when a low/modulated signal is expected indicates a high condition
- Check for continuity to battery (+) and to ground; unexpected continuity to B+ on the control wire indicates short to battery
Diagnostic algorithm
- Read and record all stored codes and relevant freeze-frame data. Note engine conditions when the code set.
- Perform a visual inspection of the intake air flow actuator, harness and connector. Look for damage, corrosion, melted insulation, or rodent chew.
- With ignition ON (engine off), backprobe the actuator control connector and measure voltage between the control pin and ground. Compare to expected behavior (should not be permanently at battery voltage if the ECM is commanding low).
- Inspect and verify ground(s) for the actuator and associated harness. Repair any poor ground connections.
- If voltage is high at the connector, disconnect the actuator and measure voltage at the harness side. If high remains, suspect wiring short to battery or ECM output stuck high. If voltage drops to expected, suspect actuator internal fault.
- Check continuity between the control wire and battery positive with ignition off. A short to B+ will show low resistance. Also check continuity to ECM connector pin to confirm harness integrity.
- Perform a wiggle/load test: with harness connected and monitoring voltage or running a live datastream, wiggle the wiring and connectors to reproduce the fault and locate intermittent shorts.
- If wiring and connector checks are good but the actuator shows abnormal behavior or the circuit measures normal only when disconnected, replace the actuator/solenoid and retest.
- If replacement of actuator and repair of wiring does not clear the fault, verify ECM output with a known-good harness or consult manufacturer procedures — ECM failure or software issue may be possible.
- Clear codes and perform a road/drive cycle to confirm the fault does not return and that intake air control operates normally.
Likely causes
- Wiring shorted to battery/ignition power on the actuator control wire
- Failed actuator/solenoid drawing abnormal voltage
- Connector contamination/corrosion causing intermittent high readings
Fault status
Status
Diesel Intake Air Flow A Control Circuit High — detected high voltage on the intake air flow actuator control circuit indicating a possible short to battery, faulty actuator, wiring fault, or ECM issue.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P02E3
LAND ROVER
P — Powertrain
Diesel intake air flow control - High circuit
Views:
UK: 9
EN: 18
RU: 17
AI status
Completed
Completed
100%
Causes
- Short to battery voltage on the intake air flow A control circuit
- Open or damaged wiring harness allowing stray/high voltage
- Corroded, bent or pushed-back terminal in the connector
- Faulty intake air flow actuator/solenoid (internal short or failed electronics)
- Poor or missing ground at actuator or ECM
- Faulty ECM (rare) or incorrect programming/calibration
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine performance or limp-home mode
- Poor idle or rough running
- Loss of intake air control (unexpected boost or reduced airflow)
- Increased black smoke or elevated emissions from diesel exhaust
What to check
- Retrieve freeze frame and live data for intake air flow/actuator command and feedback
- Visually inspect wiring and connectors for damage, corrosion, pin push-out, or melted insulation
- Backprobe the actuator connector and measure signal voltage with key on/engine running
- Check for proper ground(s) at actuator and ECM
- Perform a wiggle test while monitoring signal for intermittent changes
- Scan for related codes that may provide additional context (turbo, MAF, throttle, EGR)
Signal parameters
- Normal control circuit behavior typically shows a commanded duty cycle or 0–12V control signal depending on component design
- High-voltage fault flagged when circuit voltage is higher than the expected maximum (often near battery voltage when it should be low or modulated)
- Expected resting voltages: actuator control circuits may be low (0V) or a regulated reference; a reading consistently near battery voltage (≈11–14V) when a low/modulated signal is expected indicates a high condition
- Check for continuity to battery (+) and to ground; unexpected continuity to B+ on the control wire indicates short to battery
Diagnostic algorithm
- Read and record all stored codes and relevant freeze-frame data. Note engine conditions when the code set.
- Perform a visual inspection of the intake air flow actuator, harness and connector. Look for damage, corrosion, melted insulation, or rodent chew.
- With ignition ON (engine off), backprobe the actuator control connector and measure voltage between the control pin and ground. Compare to expected behavior (should not be permanently at battery voltage if the ECM is commanding low).
- Inspect and verify ground(s) for the actuator and associated harness. Repair any poor ground connections.
- If voltage is high at the connector, disconnect the actuator and measure voltage at the harness side. If high remains, suspect wiring short to battery or ECM output stuck high. If voltage drops to expected, suspect actuator internal fault.
- Check continuity between the control wire and battery positive with ignition off. A short to B+ will show low resistance. Also check continuity to ECM connector pin to confirm harness integrity.
- Perform a wiggle/load test: with harness connected and monitoring voltage or running a live datastream, wiggle the wiring and connectors to reproduce the fault and locate intermittent shorts.
- If wiring and connector checks are good but the actuator shows abnormal behavior or the circuit measures normal only when disconnected, replace the actuator/solenoid and retest.
- If replacement of actuator and repair of wiring does not clear the fault, verify ECM output with a known-good harness or consult manufacturer procedures — ECM failure or software issue may be possible.
- Clear codes and perform a road/drive cycle to confirm the fault does not return and that intake air control operates normally.
Likely causes
- Wiring shorted to battery/ignition power on the actuator control wire
- Failed actuator/solenoid drawing abnormal voltage
- Connector contamination/corrosion causing intermittent high readings
Fault status
Status
Diesel Intake Air Flow A Control Circuit High — detected high voltage on the intake air flow actuator control circuit indicating a possible short to battery, faulty actuator, wiring fault, or ECM issue.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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👎 Dislike
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Send to email