AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

DTC P0201 generic OBD-II code indicating an electrical malfunction in the fuel injector circuit for cylinder 1, often due to wiring issues or a faulty injector.

Common Symptoms

Check Engine Light illuminated
Engine misfire on cylinder 1
Rough idle
Reduced engine performance
Poor fuel economy

Most Common Causes

Faulty fuel injector on cylinder 1 high

Internal open or short within injector can cause abnormal resistance or loss of operation.

Open or short in injector circuit wiring high

Broken, corroded or damaged wiring or connectors leading to cylinder 1 injector.

Loose or corroded injector connector medium

Poor electrical connection at terminal can disrupt signal to injector.

Faulty Powertrain Control Module (PCM/ECM) low

PCM driver circuit malfunction is rare but possible if all wiring and injector tests are normal.

Diagnostic Steps

Use an OBD-II scan tool to confirm the presence of P0201 and check for additional related codes.

Expected: Code P0201 stored; possibly other injector or misfire codes.

Interpretation: Confirms injector circuit fault and helps identify additional issues.
Perform a visual inspection of cylinder 1 injector wiring harness and connectors.

Expected: Look for damaged insulation, loose connectors, corrosion or breaks.

Interpretation: Visible damage indicates likely wiring or connector failure.
Measure resistance of the cylinder 1 injector with a multimeter.

Expected: Resistance within manufacturer spec (common range ~10â€“16 ohms).

Interpretation: Out-of-spec resistance suggests a defective injector.
Check voltage at injector connector with ignition ON (engine off).

Expected: Battery voltage present at supply side of injector circuit.

Interpretation: Absence of voltage indicates wiring/PCM supply issue.
Perform back-probing or injector activation test with scan tool or tester.

Expected: Injector should receive pulsed signal and operate.

Interpretation: Lack of pulsed signal points to PCM or circuit fault.

Repair Solutions

Replace defective cylinder 1 fuel injector medium

Estimated Cost: $80 - $400

Injector price varies by vehicle; labor can add cost.

Repair or replace damaged wiring/connector medium

Estimated Cost: $50 - $250

Costs depend on extent of harness repair.

Replace PCM/ECM driver circuit (if faulty) hard

Estimated Cost: $300 - $1000

Only after eliminating all other causes; PCM programming often required.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Assuming code indicates a bad injector without checking wiring and connectors first

Frequently Asked Questions

Technical definition of P0201 OBD-II Code

The P0201 code stands for Cylinder 1 Injector Circuit Malfunction. This generally indicates an issue with the Fuel System system.

Reflecting on severity: How bad is P0201?

This is a medium priority issue. Can cause misfires, rough idle, reduced power and poor fuel economy; vehicle may still run but performance will be degraded.

What happens when the P0201 code is active?

The most typical signs are: Check Engine Light illuminated, Engine misfire on cylinder 1, Rough idle.

Potential causes for OBDII code P0201

It can be caused by several factors, most notably: Faulty fuel injector on cylinder 1, Open or short in injector circuit wiring, Loose or corroded injector connector.

Is P0201 expensive to fix?

It depends on what needs to be fixed. Repair or replace damaged wiring/connector repairs are cheaper (~$250), while Replace PCM/ECM driver circuit (if faulty) repairs are on the higher end (~$1000).

Is the P0201 code specific to BMW?

The P0201 code is a generic powertrain code, meaning it applies to almost all makes and models, such as Honda, Toyota, VW, Ford, and Chevy.

P0201: Cylinder 1 Injector Circuit Malfunction