What Does P02E3 Mean?
The ECM has detected that the diesel intake air flow control circuit voltage is above the expected maximum threshold. This indicates an open circuit, short to battery voltage, or high-resistance condition in the intake air flow control valve circuit. The valve may be inoperative or stuck in one position, preventing the ECM from properly controlling intake air volume.
Common Causes
30%
Open circuit in the ground wire of the intake air flow control valve causing the circuit to float high
25%
Short to battery voltage in the signal or control wire from a chafed harness contacting a power source
25%
Failed intake air flow control valve actuator with open or high-resistance internal windings
20%
Corroded or high-resistance connector terminals at the valve or ECM connector preventing proper circuit operation
Diagnostic Steps
1
Step 1: Inspect the intake air flow control valve connector for corrosion, loose pins, or damage. Measure voltage at the connector with key on, engine off to identify whether the circuit is being pulled to battery voltage.
2
Step 2: Disconnect the valve and measure resistance across the actuator motor terminals. Compare to manufacturer specification (typically 2-20 ohms). An OL reading indicates an open winding.
3
Step 3: Check the ground circuit from the valve connector back to the ECM ground splice. Measure resistance to ground, which should be less than 1 ohm. A high reading indicates an open or corroded ground path.
4
Step 4: Inspect the wiring harness for chafing against positive voltage sources. Use a wiring diagram to trace the circuit and look for areas where the control wire runs near constant-power circuits.
5
Step 5: If wiring checks normal, backprobe the ECM connector and verify the module is providing correct control signals. Command the valve through bidirectional controls to test ECM driver output.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The ECM has detected that the diesel intake air flow control circuit voltage is above the expected maximum threshold. This indicates an open circuit, short to battery voltage, or high-resistance condition in the intake air flow control valve circuit. The valve may be inoperative or stuck in one posi...
The most common cause of P02E3 (Diesel Intake Air Flow Control Circuit High) is: Open circuit in the ground wire of the intake air flow control valve causing the circuit to float high
Typical repair costs for P02E3 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A high circuit condition leaves the intake air valve inoperative, which can cause excessive smoke, poor combustion, and may trigger a reduced power derate mode.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02E3 to identify the root cause.
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Quick Info
Category
Powertrain
System
Diesel Air Intake Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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