Cylinder 2 Fuel Injector Circuit Fault
The KOHLER-COMMAND-P0202 (Kohler Command EFI) diesel fault code means: Cylinder 2 Fuel Injector Circuit Fault. This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $30-$120 DIY for injector replacement or harness repair. $150-$400 at a dealer including labor, diagnostics, and parts. ECM replacement if needed can push $400-$700 total.
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Common Symptoms
- Engine runs rough or shakes noticeably, especially at idle or under load
- EFI fault code P0202 displayed via LED blink sequence or dash readout on the mower
- Visible loss of power on slopes or when blades are engaged
- Engine may fire on only one cylinder, producing a loping or uneven exhaust note
- Fuel consumption increases because the ECU compensates for the misfiring cylinder
- Engine may eventually shut down under heavy load to protect the system
- Check engine or fault indicator light illuminates on the equipment operator panel
Probable Causes (Ranked by Likelihood)
- Failed or stuck-open/closed fuel injector on cylinder 2 Very Likely
- Open or shorted wiring harness in the cylinder 2 injector circuit Very Likely
- Corroded, spread, or backed-out connector at the cylinder 2 injector plug Likely
- ECM driver circuit failure causing no signal to cylinder 2 injector Possible
- Fuel pressure too low to allow injector to deliver proper spray pattern Possible
- Water or debris intrusion into the injector harness connector Less Likely
Step-by-Step Diagnostic Procedure
Start by pulling the fault code with the Kohler PCM diagnostic tool if available, or count the LED blink sequence on EFI models to confirm P0202 before beginning physical checks.
Locate the cylinder 2 injector, which is on the right-hand cylinder of the V-twin when viewed from the flywheel end. Unplug the 2-pin injector connector and inspect both terminals for corrosion, green oxidation, spread pins, or moisture. Clean with electrical contact cleaner and reconnect firmly.
With the key OFF and the connector unplugged, set your multimeter to resistance (ohms) and measure across the two injector terminals. A healthy Kohler EFI injector reads approximately 12-16 ohms. A reading below 5 ohms indicates a shorted injector coil. An open-loop (OL) reading means the injector coil is burned out. Replace the injector in either case.
If the injector resistance checks out, check the wiring between the injector connector and the ECM. Set your multimeter to continuity mode and probe each wire from the injector plug back to the ECM harness connector pin. Any break in continuity points to a damaged or chafed wire. Inspect the harness routing for spots where it rubs against the engine block or sheet metal.
Check injector supply voltage. Reconnect the injector connector, turn the key to RUN without cranking, and backprobe the injector connector. You should see battery voltage (approximately 12-13.5V DC) on the power wire. No voltage here points to a blown injector fuse or a break in the supply circuit.
With voltage confirmed, check for an ECM ground pulse on the signal wire while cranking. This requires a test light or a digital multimeter in DC mode. The test light should flicker rapidly during cranking. A steady dim light or no flicker means the ECM is not firing the injector. At this point, the ECM driver circuit is suspect and you need a Kohler dealer with the Kohler PCM diagnostic tool to confirm ECM failure before replacing that component.
If all electrical tests pass, consider a fuel pressure check. Kohler EFI systems require approximately 39-43 PSI at the rail. Low pressure from a weak fuel pump or clogged filter can cause injector codes even when the injector itself is fine. This test requires a fuel pressure gauge with a Schrader valve adapter and should be done carefully away from ignition sources.
Frequently Asked Questions
What does Kohler Command code P0202 mean on my commercial mower?
P0202 means the ECM detected a problem in the electrical circuit that controls the fuel injector for cylinder 2 on your EFI engine. It could be the injector itself, the wiring, or the connector. The engine is only firing reliably on one cylinder when this code is active, which is why you feel rough running and power loss.
Can I still mow with P0202 active?
You can run the mower in a limited capacity on flat ground with light grass, but the single-cylinder operation puts extra heat and stress on the engine. Running hard under full blade load with this code active risks overheating the good cylinder and warping heads or burning valves. Fix it before heavy commercial use.
How much does it cost to fix P0202 on a Kohler EFI engine?
If it is just a dirty or corroded connector, cleaning it costs nothing. A replacement injector runs $30-$80 in parts and is a moderate DIY job. A dealer visit with diagnostics and labor typically runs $150-$400. If the ECM driver circuit has failed, expect $400-$700 total at a dealer.
Will my mower start and run after getting this code?
Yes, in most cases it will still start and run on one cylinder, but performance and reliability are compromised. If the injector circuit has a hard short, the ECM may limit operation further to protect itself. Do not ignore the code expecting it to clear on its own.