Open circuit or high resistance in the wiring to the intake air flow actuator (broken, chafed or corroded wire); Corroded, loose or damaged connector at the actuator or control unit; Faulty intake air flow actuator or throttle valve motor with an open internal winding; Blown fuse or faulty relay in the actuator power supply, where fitted; Actuator seized or clogged with soot so the motor draws abnormal current; Fault in the engine control unit output driver.

P02E0

Diesel Intake Air Flow A Control Circuit/Open.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
E0: FaultThe specific fault in that area

What it means

P02E0 is the generic code for an open circuit in the control circuit of the diesel intake air flow actuator, usually the intake throttle or air flow control valve designated 'A'. The engine control unit commands the actuator and monitors the circuit, and it set the code because it saw an open circuit or no current flow where it expected a response. The exact actuator and its location depend on the model and engine.

Symptoms

Engine warning light on
Reduced power or limp mode
Rough or unstable idle
Engine shudders or runs on when switched off
Poor or lumpy acceleration
Increased smoke or hard starting

Possible causes

Open circuit or high resistance in the wiring to the intake air flow actuator (broken, chafed or corroded wire)likely
Corroded, loose or damaged connector at the actuator or control unitlikely
Faulty intake air flow actuator or throttle valve motor with an open internal windinglikely
Blown fuse or faulty relay in the actuator power supply, where fittedpossible
Actuator seized or clogged with soot so the motor draws abnormal currentpossible
Fault in the engine control unit output driverrare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting any related actuator or air flow codes
Check the manufacturer's information for which actuator is 'A' on this engine and where it is fitted
Inspect the actuator wiring and connector for chafing, heat damage, corrosion, water ingress and pushed-back pins
Check the relevant fuses and relays and the power and earth supply at the actuator connector
Measure the actuator winding resistance and compare it with the manufacturer's specification
Using a scan tool, command the actuator and watch for movement and a change in the reported position
Check the wiring for continuity and shorts between the actuator connector and the control unit connector
Remove the actuator and inspect for soot build-up or sticking, following the manufacturer's procedure

How to fix

Repair or replace damaged wiring and restore good connections
Clean or replace corroded connector terminals and secure the connector
Replace the intake air flow actuator or throttle assembly if it is faulty or seized, and carry out any required adaptation or learning procedure
Replace the failed fuse or relay after finding why it failed
Clean soot deposits from the actuator and intake passage if that is the cause, then check the operation
Repair or replace the control unit only after the wiring and actuator are proven good

Can I keep driving?

Medium severity

The car may be driven short distances if it runs acceptably, but it may go into limp mode and the fault could worsen. Get it diagnosed soon, and stop driving if power is severely reduced or the engine runs very roughly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.