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

Overview

P0290 indicates an OBD-II generic powertrain trouble code where the engine control module (ECM/PCM) detects that cylinder number 10 is not contributing power/balance within expected calibration thresholds.

Common Symptoms

Check Engine light ON
Rough idle
Reduced engine power and acceleration
Decreased fuel economy

Most Common Causes

Faulty or clogged fuel injector on cylinder 10 high

Injector may not deliver sufficient fuel causing low contribution from cylinder 10

Electrical issue (open/short/connector corrosion) in injector circuit 10 medium

Wiring harness damage or poor connector contact can disrupt injector operation

Ignition system fault on cylinder 10 (spark plug or coil) medium

Weak spark can reduce cylinder power; referenced in some technical diagnostic discussions

Low cylinder compression or mechanical fault low

May require compression testing; noted in some extended technical interpretations

Diagnostic Steps

Connect a professional OBD-II diagnostic scanner and retrieve P0290 and related codes

Expected: Presence of P0290 linked with cylinder contribution or injector circuit codes

Interpretation: Confirms that cylinder 10 contribution issue is currently active
Visually inspect fuel injector #10 wiring and connector for corrosion, damage, and secure connection

Expected: No corrosion, broken wires, or loose connections

Interpretation: Bad wiring/connector issues often cause low injector performance
Conduct injector operation test (listening for clicking or use injector test tool/multimeter)

Expected: Injector clicks and shows proper electrical values

Interpretation: Non-clicking or abnormal readings suggest faulty injector or circuit
Perform compression test on cylinder 10

Expected: Cylinder 10 compression within manufacturer spec compared to other cylinders

Interpretation: Low compression suggests mechanical issues affecting cylinder balance

Repair Solutions

Clean or replace fuel injector for cylinder 10 medium

Estimated Cost: $150 - $500

Depends on injector type and accessibility

Repair or replace damaged injector wiring/connectors medium

Estimated Cost: $50 - $200

Cost varies with labor and parts

Replace spark plug or ignition coil on cylinder 10 easy

Estimated Cost: $20 - $150

Applicable if ignition faults detected

Address internal engine mechanical issues (e.g., repair piston/rings/valves) hard

Estimated Cost: $500 - $2500

Requires deeper engine service

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Turbocharger underboost (incorrect interpretation from some generic DTC sites)

Frequently Asked Questions

What is the definition of the P0290 engine code?

Cylinder 10 Contribution/Balance Fault is the standard definition for P0290. This diagnostic code is triggered when the ECU detects a problem in the Fuel System.

Is it safe to drive with a P0290 code?

You should treat P0290 as a medium issue. Check Engine light illuminated with potential rough idle, reduced power, and poorer fuel economy

What happens when the P0290 code is active?

You may experience the following: Check Engine light ON, Rough idle, Reduced engine power and acceleration.

Why is my car throwing a P0290 code?

The most common causes are: Faulty or clogged fuel injector on cylinder 10, Electrical issue (open/short/connector corrosion) in injector circuit 10, Ignition system fault on cylinder 10 (spark plug or coil).

How much does it cost to fix P0290?

The cost varies significantly based on the root cause. For example, replacing a Replace spark plug or ignition coil on cylinder 10 typically costs between $20 and $150, while fixing a Address internal engine mechanical issues (e.g., repair piston/rings/valves) can range from $500 to $2500.

What cars are affected by the P0290 code?

This is a universal code. You might see P0290 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

P0290: Cylinder 10 Contribution/Balance Fault