P268C — Cylinder 1 Injector Data Incompatible
OBD2 code P268C flags a problem with the fuel delivery and mixture control (cylinder 1 injector data incompatible). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
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
- Read the code and freeze frame Connect an OBD2 scanner, confirm P268C is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- 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.
- 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.
- Subsystem check Measure fuel pressure at the rail and compare with factory specification at idle and under load.
- Subsystem check Check short-term and long-term fuel trims in live data to see which way the mixture is off.
- Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P268C does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P268C (parts and labor, USD, independent shop rates): Replace the fuel pump: $400–$900; Replace the fuel filter: $80–$200; Replace the pressure regulator or sensor: $150–$450; Clean or replace injectors: $200–$800. Overall, fixing P268C 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
What is the most common cause of P268C?
The most common causes are: faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
How do I diagnose P268C myself?
Start with a scan: confirm P268C, 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.
What does OBD2 code P268C mean?
OBD2 code P268C flags a problem with the fuel delivery and mixture control (cylinder 1 injector data incompatible). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
What are the symptoms of P268C?
Drivers most often notice: increased fuel consumption, fuel smell in severe cases, rough idle and hesitation, Check Engine Light on.
How much does it cost to fix P268C?
Replace the fuel pump — $400–$900; Replace the fuel filter — $80–$200; Replace the pressure regulator or sensor — $150–$450; Clean or replace injectors — $200–$800. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.
What does P268C mean?
Seeing P268C on your scanner? The control unit has caught the fuel delivery and mixture control operating outside its calibrated window. The formal description is “Cylinder 1 Injector Data Incompatible”, and the code is grouped under powertrain (engine/transmission) faults.
P268C refers specifically to cylinder 1. On inline engines cylinders are counted from the front (belt end); on V-engines the numbering depends on the manufacturer, so check the firing-order diagram for your exact model. Location matters for the repair bill: some cylinders require intake manifold removal, which adds labor time.
The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P268C and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.
What causes P268C?
- weak fuel pump or clogged fuel filter
- faulty fuel pressure regulator
- vacuum or intake leaks skewing the mixture
- faulty fuel rail pressure sensor or wiring
- contaminated or incorrect fuel
Common symptoms of P268C
- increased fuel consumption
- fuel smell in severe cases
- rough idle and hesitation
- Check Engine Light on
- loss of power under load
How to diagnose P268C
- Connect an OBD2 scanner, confirm P268C is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- 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.
- Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
- Measure fuel pressure at the rail and compare with factory specification at idle and under load.
- Check short-term and long-term fuel trims in live data to see which way the mixture is off.
- Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P268C does not return.
How to fix P268C
Start with the cheapest and most common causes before replacing expensive parts:
- Replace the fuel pump — $400–$900
- Replace the fuel filter — $80–$200
- Replace the pressure regulator or sensor — $150–$450
- Clean or replace injectors — $200–$800
How much does it cost to fix P268C?
Repair cost depends on which component actually failed. Typical scenarios for P268C (parts and labor, USD, independent shop rates):
- Replace the fuel pump: $400–$900
- Replace the fuel filter: $80–$200
- Replace the pressure regulator or sensor: $150–$450
- Clean or replace injectors: $200–$800
Overall, fixing P268C 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.
Can you drive with P268C?
Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.