P0201 Cylinder 1 Injector Circuit Malfunction

Description and meaning of DTC p0201

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. P0201 means that the PCM detected a fault in the injector or the wiring tothe injector. It monitors the injector and when the injector is activated, thePCM expects to see the voltage pulled "low" or close to zero. When the injector is switched off, the PCM expects to see a voltage that is closeto battery voltage or "high". If it doesn't see the expected voltagethe PCM will set this code. The PCM also monitors resitance in the circuit. If the resistance is excessively low or high it will set this code.

p0201 diagnostic trouble code symptoms

The symptoms for this code will likely be a misfire and a rough running engine. Poor acceleration. The MIL will also be illuminated.

DTC p0201 - possible causes

The causes could be any of the following: Bad injector. This is usually the cause of this code but doesn't rule outthe possibility of one of the other causes Open in the wiring to the injector Short in the wiring to the injector Bad PCM

How to fix OBD-II diagnostic trouble code p0201

First, using a DVOM check the resistance of the injector. If it isn'twithin specs, then replace the injector. Check for voltage at the fuel injector connector. It should have 10 voltsor more. Visually check the connector for damage or broken wires. Visually check the injector for damage. If you have access to an injector tester, activate the injector and seeif it operates. If the injector operates, then you likely have either an openin the wiring, or a blocked injector. If you do not have access to a tester,swap the injector with another one and see if the code changes. If the codechanges, then change the injector. At the PCM, remove the driver wire from the PCM connector and Ground thewire. (Make sure you have the correct wire. If you're not sure, do not attempt)The injector should activate Replace the injector

More OBD-II diagnostic trouble codes (DTC)