P2690 — Cylinder 5 Injector Data Incompatible
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 P2690 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 P2690 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P2690 (parts and labor, USD, independent shop rates): Replace the fuel filter: $80–$200; Replace the pressure regulator or sensor: $150–$450; Replace the fuel pump: $400–$900; Clean or replace injectors: $200–$800. Overall, fixing P2690 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
Will P2690 clear itself?
Sometimes P2690 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.
How do I diagnose P2690 myself?
Start with a scan: confirm P2690, 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.
How much does it cost to fix P2690?
Replace the fuel filter — $80–$200; Replace the pressure regulator or sensor — $150–$450; Replace the fuel pump — $400–$900; 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 are the symptoms of P2690?
Drivers most often notice: increased fuel consumption, fuel smell in severe cases, hard starting or long cranking, loss of power under load.
What does OBD2 code P2690 mean?
Cylinder 5 Injector Data Incompatible (P2690): 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 vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator, faulty fuel rail pressure sensor or wiring.
What does P2690 mean?
When P2690 appears on a scan, it means the control module has flagged a problem in the fuel delivery and mixture control: cylinder 5 injector data incompatible. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.
P2690 refers specifically to cylinder 5. 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.
To set P2690, the control module compares live readings of the fuel delivery and mixture control against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.
What causes P2690?
- faulty fuel pressure regulator
- weak fuel pump or clogged fuel filter
- vacuum or intake leaks skewing the mixture
- contaminated or incorrect fuel
- faulty fuel rail pressure sensor or wiring
- clogged or leaking fuel injectors
Common symptoms of P2690
- increased fuel consumption
- fuel smell in severe cases
- hard starting or long cranking
- loss of power under load
- rough idle and hesitation
How to diagnose P2690
- Connect an OBD2 scanner, confirm P2690 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 P2690 does not return.
How to fix P2690
Start with the cheapest and most common causes before replacing expensive parts:
- Replace the fuel filter — $80–$200
- Replace the pressure regulator or sensor — $150–$450
- Replace the fuel pump — $400–$900
- Clean or replace injectors — $200–$800
How much does it cost to fix P2690?
Repair cost depends on which component actually failed. Typical scenarios for P2690 (parts and labor, USD, independent shop rates):
- Replace the fuel filter: $80–$200
- Replace the pressure regulator or sensor: $150–$450
- Replace the fuel pump: $400–$900
- Clean or replace injectors: $200–$800
Overall, fixing P2690 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 P2690?
Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.