P21A1 Isuzu Zxs OBD Code

OBD/2 P21A1 error code description and symptoms.

Brake Switch Circuit Input Malfunction Indicates PCM did not receive a brake pedal position (BPP) input. Open or short in BPP circuit Open or short in stoplamp circuits Damaged PCM Malfunction in module(s) connected to BPP circuit. (Rear Electronic Module [REM] Windstar and LS6/LS8 or Lighting Control Module (LCM) Continental and Town Car. Damaged brake switch Misadjusted brake switch Check for proper function of stoplamps.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

P21A1 Isuzu Zxs Error Code Repair Process :

If your persistent misfire check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system P21A1 and engine control unit are in charge of monitoring a bunch of different persistent misfire, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Isuzu Zxs P21A1 OBD2 Code

A common cause of code P21A1 is the failure of Persistent Misfire, but there are several other possible causes as well, such as ;

Failures of clutch motion/travel sensors.
Faulty Mass Air Flow (MAF) sensor
Improper ignition timing
Faulty variable valve timing (VVT)

P21A1 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

About Us | Contact | Privacy

P21A1 Isuzu Zxs OBD Code

P21A1 Isuzu Zxs Error Code Repair Process :

Common Causes of Isuzu Zxs P21A1 OBD2 Code

P21A1 code for other Isuzu cars