P1299 — Injector High Side Open - Bank 2/Target idle not reached

For Ford vehicles

engine coolant temperature sensor against cylinder head overheating on

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P1299 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
  4. Subsystem check Measure fuel pressure at the rail and compare with factory specification at idle and under load.
  5. Subsystem check Check short-term and long-term fuel trims in live data to see which way the mixture is off.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P1299 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P1299 (parts and labor, USD, independent shop rates): Clean or replace injectors: $200–$800; Replace the pressure regulator or sensor: $150–$450; Replace the fuel pump: $400–$900; Replace the fuel filter: $80–$200. Overall, fixing P1299 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How much does it cost to fix P1299?

Clean or replace injectors — $200–$800; Replace the pressure regulator or sensor — $150–$450; Replace the fuel pump — $400–$900; Replace the fuel filter — $80–$200. 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 P1299?

The most common causes are: clogged or leaking fuel injectors, vacuum or intake leaks skewing the mixture, weak fuel pump or clogged fuel filter.

Is it safe to drive with P1299?

Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.

What does OBD2 code P1299 mean?

Injector High Side Open - Bank 2/Target idle not reached (P1299): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by clogged or leaking fuel injectors, vacuum or intake leaks skewing the mixture, weak fuel pump or clogged fuel filter.

How do I diagnose P1299 myself?

Start with a scan: confirm P1299, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the fuel delivery and mixture control, and verify the suspect component against live data before buying parts.

P1299 indicates the engine control module has detected an open circuit condition on the high-voltage side of the fuel injector circuit for Bank 2 while simultaneously failing to achieve target idle speed. This falls within the powertrain diagnostic category under the OBD2 standard, meaning it applies to all vehicle makes and models equipped with this system.

Bank 2 refers to the engine bank that does not contain cylinder number one. On V-type engines, this is the opposite side from where cylinder one sits. Understanding which bank is Bank 2 on your specific engine is essential before performing any testing or parts replacement.

To trigger P1299, the control module monitors live data from the fuel delivery system and compares those readings against factory-calibrated parameters, typically across multiple drive cycles. The module also captures a freeze frame snapshot—recording RPM, engine load, coolant temperature, and vehicle speed at the exact moment the fault occurs. Reviewing this snapshot first provides valuable context and can significantly shorten diagnostic time.

Symptoms of P1299

The following signs commonly accompany this trouble code:

  • Noticeable loss of power when the engine is under load
  • Fuel odor, particularly in more severe cases
  • Decreased fuel economy compared to normal operation
  • Rough idle quality and hesitation during acceleration
  • Difficulty starting the engine or extended cranking periods
  • Illumination of the Check Engine light on the dashboard

Common Causes of P1299

The most frequent culprits behind P1299 include:

  • Fuel delivery restrictions such as a weak fuel pump or clogged fuel filter
  • Intake or vacuum leaks that upset the air-fuel mixture balance
  • Contaminated or incorrect fuel type affecting injector performance
  • Faulty fuel pressure regulator unable to maintain proper rail pressure
  • Wiring issues between the ECU and Bank 2 injectors including corrosion, chafing, or loose connectors
  • Failed or failing fuel injectors that do not respond properly to high-side commands

How to Diagnose P1299

Follow these practical steps to identify the root cause:

  1. Connect an OBD2 scanner and verify P1299 is stored in the ECU. Save the freeze frame data immediately—it shows exactly what conditions existed when the fault was detected and helps reproduce the failure during testing.
  2. Review all other stored diagnostic codes. Related codes often point toward the actual underlying problem. Also search for manufacturer technical service bulletins specific to your vehicle make and model—some P0xxx codes have documented factory fixes or software calibration updates available.
  3. Perform a thorough visual inspection of the wiring harness and electrical connectors serving Bank 2 fuel injectors. Look for damaged wire insulation, corrosion buildup, chafing from contact with other components, or loose terminal connections.
  4. Measure fuel pressure at the fuel rail using a proper gauge and compare results against factory specifications. Test at idle and under simulated load conditions to ensure pressure remains within acceptable range throughout operation.
  5. Monitor short-term and long-term fuel trim values in the scanner's live data screen. Sustained positive trims indicate the ECU is compensating for a lean condition, which points toward fuel delivery problems rather than purely electrical faults.
  6. Clear the code after addressing any obvious issues and complete a full drive cycle that recreates the conditions from the freeze frame data. Confirm P1299 does not return before considering the repair complete.

Repair Options and Costs

Address the most affordable and common causes before investing in expensive components:

  • Fuel filter replacement: $80–$200
  • Fuel pressure regulator or sensor replacement: $150–$450
  • Fuel injector cleaning or replacement: $200–$800
  • Fuel pump replacement: $400–$900

When you factor in parts and labor at independent shop rates in the United States, total repair costs for P1299 typically fall between $80 and $900 depending on which component failed. An accurate diagnosis before purchasing parts will save money—the most expensive scenario is rarely the first place to look.

Can You Drive With P1299?

Proceed with caution. While the vehicle may operate normally in some conditions, fuel delivery and mixture control faults can produce hesitation, stalling, or reduced power output—situations that become hazardous in traffic. Prolonged operation with an unresolved fuel system issue risks catalyst damage if the mixture runs excessively rich. Have this code diagnosed promptly and avoid long trips until the underlying cause is identified and repaired.

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