U0222 Pontiac 28 Diagnostic Trouble Code
U0222 Pontiac 28 code definition:
U0222 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code for Pontiac 28.
U0222 Pontiac 28 shows up when there's an electrical problem that causes the fuel volume regulator to malfunction and open. It's quite an unusual problem and likely intermittent. The spark should have a light tan color. If the sensor probe comes with white and chalky parts, this means it has been lagging between switching phases, and should be replaced.
Symptoms
Symptoms of a U0222 Pontiac 28 diagnostic trouble code may include:
- The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
- Faulty PCM
- If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
- The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
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Possible Causes :
- Defective ECU strategies or components will prevent proper regeneration
- The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
- An air leak forward of the DPF will change the sensor readings resulting in the code
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Common Misdiagnoses
- Control Module Throttle Actuator Position Performance Problem
- Air Conditioning (A/C) Clutch Feedback Circuit High Voltage Problem
- Cruise Vehicle Speed/Set Speed Difference Too High Problem
- Kick-Down Switch Failed Short Problem
- Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit Problem
Repair Processes :
With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.
Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.
Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.
Process Tips
Diagnostic trouble code U0222 Pontiac 28 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.
Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before U0222 Pontiac 28.
Fortunately, U0222 Pontiac 28 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
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