P1298 — Injector High Side Open - Bank 1

How much does it cost to fix P1298?

Clean or replace injectors — $200–$800; Replace the fuel filter — $80–$200; Replace the fuel pump — $400–$900; Replace the pressure regulator or sensor — $150–$450. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What is the most common cause of P1298?

The most common causes are: contaminated or incorrect fuel, vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors.

What does OBD2 code P1298 mean?

OBD2 code P1298 flags a problem with the fuel delivery and mixture control (injector high side open - bank 1). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or incorrect fuel, vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors.

Will P1298 clear itself?

Sometimes P1298 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What are the symptoms of P1298?

Drivers most often notice: Check Engine Light on, increased fuel consumption, rough idle and hesitation, loss of power under load.

P1298 indicates a problem with the high-side circuit of the fuel injectors on bank one of your engine. When the powertrain control module detects an open circuit condition—meaning the electrical path to one or more injectors on cylinder one's side of the engine is broken or missing—it stores this trouble code and illuminates the check engine light. The module constantly monitors injector operation while the engine runs, comparing actual performance against calculated values. If readings stray outside acceptable limits for enough consecutive drive cycles, P1298 gets triggered and logged.

Bank one refers specifically to the engine bank containing cylinder number one. Depending on your vehicle's design, this could be the left side or right side of the engine—check your service manual to confirm before beginning any diagnosis or repair work. When the high-side driver for the injector circuit fails its self-check, the ECU recognizes the abnormal condition and sets P1298 to alert you that fuel delivery to that bank may be compromised. Freeze frame data captured alongside the code shows you exactly what was happening—engine speed, load percentage, coolant temperature, vehicle speed—when the fault first appeared, giving you a precise starting point for tracking down the root cause.

Fuel injectors rely on precise electrical pulses from the ECU to deliver the correct amount of fuel at exactly the right moment. The high-side circuit refers to the positive voltage supply side of this system. An open circuit means the electrical connection has been interrupted somewhere between the ECU's injector driver and the injector itself. This could be a broken wire, a failed connector, corroded pins, or an internal fault within the injector coil. When this circuit opens, the injector stops receiving its operating voltage, and fuel delivery to that cylinder bank becomes erratic or stops entirely.

Common Symptoms

• The check engine light stays illuminated on the dashboard
• Fuel consumption increases noticeably compared to normal driving
• The engine idles roughly with noticeable vibration or hesitation
• Acceleration feels weak, especially under load or when climbing hills
• A strong fuel odor may be noticeable, particularly in severe cases
• The engine may misfire or stall, especially at idle or low speeds

Common Causes

When troubleshooting P1298, work through these potential culprits in rough order of how frequently they typically fail:

• Damaged or corroded wiring harness and connectors in the injector circuit
• Failed fuel injectors with broken internal coils or poor electrical connections
• Malfunctioning fuel pump unable to maintain adequate rail pressure
• Clogged fuel filter restricting fuel flow to the injectors
• Faulty fuel rail pressure sensor sending incorrect data to the ECU
• Vacuum leaks allowing unmetered air to enter the intake manifold

How to Diagnose

Follow these steps to systematically identify the source of P1298:

1. Connect an OBD2 scanner and verify that P1298 is stored in the ECU memory. Save the freeze frame data—it shows the exact engine conditions (RPM, load, temperature, speed) when the fault occurred and is your best guide for recreating the failure condition.
2. Look for any additional trouble codes stored alongside P1298. Related codes often point directly to the failing component, whether it's a sensor, wiring issue, or fuel system problem.
3. Perform a thorough visual inspection of all wiring and connectors associated with bank one fuel injectors. Look for chafed insulation, broken wires, corrosion buildup, and pins that are pushed out or loose in their housings.
4. Measure fuel rail pressure with a gauge and compare the readings to factory specifications. Check pressure both at idle and under load to see if the pump and regulator maintain proper output.
5. Monitor short-term and long-term fuel trims using your scanner's live data function. Sustained positive or negative trims indicate whether the mixture is running rich or lean, which narrows your search considerably.
6. Clear P1298 after your inspection and testing, then drive the vehicle through a complete drive cycle that reproduces the conditions captured in the freeze frame. If P1298 returns, the fault is confirmed and active rather than intermittent.

Repair Options and Costs

Depending on what your diagnosis reveals, here are typical repair costs for common P1298-related failures:

• Clean or replace fuel injectors: $200–$800
• Replace fuel filter: $80–$200
• Replace fuel pump assembly: $400–$900
• Replace fuel pressure regulator or sensor: $150–$450

Labor rates at independent shops typically run $75–$125 per hour depending on your region.

Total Repair Cost

The actual cost to fix P1298 varies widely depending on which component is responsible. Simple fixes like a clogged fuel filter fall at the lower end around $80–$200 installed. Injector replacement or cleaning typically runs $200–$800 depending on whether you can clean the existing injectors or need full replacements. The fuel pump is the most expensive single component, usually requiring $400–$900 when labor is included. In most cases, fixing P1298 costs somewhere between $80 and $900 total. A proper diagnosis before purchasing parts is essential—the least likely and most expensive failure should never be the first thing you replace.

Can You Drive with P1298?

P1298 carries a caution severity rating. While your vehicle may continue running briefly with this code stored, fuel delivery problems can quickly lead to stalling, severe hesitation, or misfiring—situations that become dangerous in traffic or at highway speeds. Prolonged operation with an incorrect air-fuel mixture can also overheat and damage the catalytic converter. Drive with caution and limit your distance until you can perform a proper diagnosis. Avoid extended trips or high-load driving until the underlying cause has been identified and corrected.

Related OBD2 Codes

• P1200: SCP HBCC Failed To Initialize
• P1201: Key Off Voltage High
• P1202: Key Off Voltage Low
• P1203: Pump Rotor Control Underfueling
• P1204: Fuel Level Input Circuit Low
• P1205: Injector Control Circuit